Nanoscience and technology articles within NPG Asia Materials

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  • Article
    | Open Access

    The structure of a commercially important glass-ceramic ZrO2-doped lithium aluminosilicate system during its initial nucleation stage was investigated by an X-ray multiscale analysis which enables us to observe the structure from the atomic to the nanometer scale by using diffraction, small-angle scattering, absorption, and anomalous scattering techniques. The combinatorial approach revealed that the formation of edge sharing between the ZrOx polyhedra and (Si/Al)O4 tetrahedra, and that the Zr-centric periodic structure in which the local structure of the Zr4+ ions resembled a cubic or tetragonal ZrO2 crystalline phase was potentially the initial crystal nucleus for the Zr-doped lithium aluminosilicate glass-ceramic.

    • Yohei Onodera
    • , Yasuyuki Takimoto
    •  & Shinji Kohara

  • Article
    | Open Access

    Magnonic noise has unveiled magnon dynamics, including nonlinear scattering processes.

    • Ryo Furukawa
    • , Shoki Nezu
    •  & Koji Sekiguchi

  • Article
    | Open Access

    Two-dimensional semiconductors are considered as field-effect transistors to overcome short channel effects and reduce the device size. As contacts to the metallic electrodes are decisive for the device performance, we study the electronic properties of contacts between Janus MoSSe and various two-dimensional metals. We demonstrate that weak interactions at these van der Waals contacts suppress Fermi level pinning and show that ohmic contacts can be formed for both terminations of Janus MoSSe, generating favorable transport characteristics.

    • Ning Zhao
    • , Shubham Tyagi
    •  & Udo Schwingenschlögl

  • Article
    | Open Access

    Osmotic energy generation, using aramid nanofiber (ANF) semiconductor membranes for light-driven proton transport, displayed wavelength and intensity-dependent potential and current under unilateral illumination. The simultaneous application of illumination and pressure led to a five-fold voltage increase and a three-fold current increase. Density functional theory calculations and spectroscopic measurements confirmed ANF’s role in photoinduced proton transport. This research has significant implications for developing flexible, stable ANF membrane-based energy devices.

    • Cheng Chen
    • , Yunxiao Lin
    •  & Dan Liu

  • Article
    | Open Access

    Controlling molecular spin quantum bits optically could help us reduce decoherence and raise the working temperature of quantum computing. Here we show theoretically exchange interactions and spin dynamics could be mediated by optically driven triplet state, leading to quantum gate operations. This indicates a great potential for radical as molecular building block for quantum circuits. A molecular quantum architecture, combining molecular network and nano-photonics, was also proposed. We thus expect the computational exploration of chemical database for molecular quantum computing. This work would therefore open up a new direction to use optical instruments and ‘Click Chemistry’ towards molecular quantum technology.

    • Tianhong Huang
    • , Jiawei Chang
    •  & Wei Wu

  • Article
    | Open Access

    An interfacial co-assembly strategy for synthesizing gradient mesoporous hollow silica sheets is reported. The SO42− and NH4+ were aggregated by protonated amphiphilic polymer PVP and formed (NH4)2SO4 crystals at the n-pentanol-water interface. Negatively charged silica oligomers can be confined on the (NH4)2SO4 crystal surface by the Coulomb interaction of NH4+ and co-assembled with CTAB under the catalysis of ammonia molecules. After removing the (NH4)2SO4 cores and CTAB template by washing and extraction, the first layer of mesoporous hollow silica was formed. Modulating the n-pentanol-water interface to n-hexane-water interface, n-hexane swelled CTAB micelle co-assembled with silica oligomers and formed the second layer of mesoporous silica with larger pore size. The finally obtained gradient mesoporous silica sheet shows remarkable gradient rejection rates for molecules with different sizes.

    • Yangbo Dong
    • , Danyang Feng
    •  & Zhen-An Qiao

  • Article
    | Open Access

    Precisely tunable high-entropy oxides (HEO) via controllable one-step combustion within a few seconds offers the rational design capability of optimal phases, structures and configurational entropy. The screened HEO-based anodes exhibit outstanding specific capacity (1165 mAh g−1, 80.9% retention at 0.1 A g−1, and 791 mAh g−1 even at 3 A g−1), excellent rate capability, and stable cycling life (1252 mAh g−1, 80.9% retention after 100 cycles at 0.2 A g−1).

    • Dongjoon Shin
    • , Seunghoon Chae
    •  & Wonjoon Choi

  • Article
    | Open Access

    A facile and scalable approach was developed using ultrafine bubble (UFB)-assisted heteroagglomeration to fabricate high-concentration, impurity-free nanoceramic/metal composite powders for additive manufacturin. Individual ZrO2 or Al2O3 nanoparticles up to ~10 wt% were homogeneously decorated on the surface of Ti-6Al-4V powders through the bridging effect of the negatively charged UFBs. The nanoceramics were completely decomposed and dissolved into the matrix upon laser irradiation; therefore, a unique Ti nanocomposite exhibiting both high strength and ductility was obtained.

    • Mingqi Dong
    • , Weiwei Zhou
    •  & Naoyuki Nomura

  • Article
    | Open Access

    In this work, we report a strategy with which to realize efficient manipulation of CNT networks by forming double networks with branched polyethylenimine (PEI). The double network was highly viscoelastic and ductile and enabled efficient film stretching or creeping for CNT alignment, which dramatically improved the mechanical strengths of the CNT films. Due to viscous drag from the polymer network, the CNTs showed enhanced movability in reconstructing new networks, which made the film repairable. The repairability resulted from the branched polymeric structure. This double-networking strategy provides a new way to manipulate CNT assemblies for high-performance applications.

    • Xiaohua Zhang
    • , Xin Wang
    •  & Qingwen Li

  • Article
    | Open Access

    Although the electrostatic tuning by three-terminal devices is generally weak for phase transition materials, it can control phases with much hither precision than temperature or pressure. This technique was applied to the scaled-down VO2 metal-insulator transitions, where the material phase is controlled by the gate voltage. The crossover from continuous to binary transition with scaling down was demonstrated, and the critical channel length was given by domain boundary instability. Interestingly, below the critical channel length, the influence of the noncritical stimulus (drain voltage in this case) disappeared because the spatial degree of freedom is lost in the single-domain VO2 channel.

    • Takeaki Yajima
    • , Yusuke Samata
    •  & Akira Toriumi

  • Article
    | Open Access

    We developed a novel surface engineering technique using electrospinning and hydrothermal processes to create a flexible, binder-free electrode composed of Ti3C2Tx MXene/carbon nanofibers (MCNFs) coated with amorphous RuOx. The MXene served as a template for the growth of amorphous and disordered state RuOx that positively impacted electrochemical performance. The combination of RuOx and MXene resulted in an enhanced pseudocapacitive reaction, resulting in a supercapacitor with a record-high energy density of 8.5 Wh kg–1 at 85.8 W kg–1, as well as excellent flexibility.

    • Hyewon Hwang
    • , Sungeun Yang
    •  & Dongju Lee

  • Review Article
    | Open Access

    This review highlights the recent advances in the bioapplications of higher-order DNA origami structures at multiple scales. After a brief introduction to the development of DNA origami, we describe the use of DNA origami structures to assist in single-molecule studies, manipulate lipid membranes, direct cell behaviors, and deliver drugs as smart nanocarriers. Our opinions on the current challenges and future directions are also shared.

    • Yihao Zhou
    • , Jinyi Dong
    •  & Qiangbin Wang

  • Article
    | Open Access

    A core/shell structured hybrid film comprised of N-doped carbon covering on single-wall carbon nanotubes (SWCNTs) were synthesized by a rapid electropolymerization method, which not only contains abundant exposed pyridinic N that leads to excellent catalytic activity for both ORR and OER, but also perfectly inherits the high conductivity, excellent flexibility, and porous structure of original SWCNT film, making it a desirable integrated oxygen electrode for Zn-air batteries.

    • Yu Meng
    • , Yi-Ming Zhao
    •  & Hui-Ming Cheng

  • Review Article
    | Open Access

    The exquisite structures of biological ion channels provide inspiration for designing and constructing artificial ion channels to achieve analogous functions. Hierarchically engineered heterogeneous nanochannels with excellent ion rectification, selectivity, and gating properties have attracted more and more attention. In this review, we briefly review the recent advances of hierarchically engineered nanochannel systems in terms of pore-on-pore and pore-in-pore structures, with an emphasis on the promising applications, including ion-selective transport, osmotic energy harvesting, separation, and biosensing.

    • Minmin Li
    • , Yuchen Cao
    •  & Guangyan Qing

  • Review Article
    | Open Access

    Nanoarchitectonics concept is essential to bridge the gaps between biology and materials chemistry. Based on this fundamental principle, this review article provides pore-engineered nanoarchitectonics for cancer therapy by integrating basic descriptions and exemplifying therapy applications. This review paper briefly summarizes pore-engineered nanoarchitectonics basics according to classification based on material porosity and composition. We discuss how to design mesoporous material and highlight the appealing points of the progress in the clinical translation of mesoporous materials for cancer treatment. Nanoarchitectonics could be an important key concept for future advanced life technologies as well as currently required cancer therapy.

    • Linawati Sutrisno
    •  & Katsuhiko Ariga

  • Article
    | Open Access

    Gyroid-structured nanoporous chitosan is successfully fabricated by templated crosslinking reaction using nanoporous polymer as a template. A multiple pore-filling process is developed for templated synthesis to give well-ordered nanoporous chitosan. Bio-mimicking from the structural coloration of butterfly wing structure, the nanoporous chitosan with gyroid texture is highly appealing in the application of high reflective materials for UV optical devices.

    • Tze-Chung Lin
    • , Chih-Ying Yang
    •  & Rong-Ming Ho

  • Article
    | Open Access

    Developing a new technique/method and/or mechanism for separating ionic charges is critical to the fabrication of a high-performance nanogenerator. Here, we demonstrate that the magnetic force can be used to drive the movement and separation of charges within metal nanoparticles film when these nanoparticles are functionalize with charged magnetic ligands. Placing the magnetic field induces the gradient distribution of magnetic counterions which subsequently transforms into the electric potential and outputs electrical energy.

    • Jingyu Wang
    • , Tao Xiao
    •  & Yong Yan

  • Article
    | Open Access

    A hybrid surface electrode array was developed, which exhibits superior signal-to-noise ratio (SNR) and outstanding conformality with the cortex surface. It was used to detect the brain signals in awake, free-moving rat models with high-throughput spatiotemporal resolution. In addition, the pilocarpine-induced epileptic discharges and behavior were considerably suppressed upon the usage of this electrode-array system. These findings pave the way for the integration of graphene into bio-medical device platforms, and their use in cranial neuropathy treatment.

    • Jeongsik Lim
    • , Sangwon Lee
    •  & Jong-Hyun Ahn

  • Article
    | Open Access

    We optimized the RL-QN15 peptide to obtain the cyclic heptapeptide (CyRL-QN15) with excellent therapeutic potency against skin wounds. Then, a multifunctional HPDAlCyRL-QN15/ZA hydrogel was prepared and characterized, which significantly enhanced the pro-healing potency of CyRL-QN15. This non-toxic hydrogel accelerated the proliferation, migration, and tube formation of skin cells, regulated the secretion of cytokines, directly scavenged free radicals, and decreased reactive oxygen species. Moreover, the HPDAlCyRL-QN15/ZA hydrogel accelerated the healing of skin wounds in type 2 diabetic mice and diabetic patient skin cultured ex vivo by promoting the polarization of macrophages to reduce inflammation, re-epithelialization, deposition of collagen, and angiogenesis.

    • Zhe Fu
    • , Huiling Sun
    •  & Xinwang Yang

  • Article
    | Open Access

    Natural polyphenols reduce metal ions into metal nanoclusters in water followed by subsequent self-assembly into metal-ornamented polyphenol supramolecular (MOPS) assemblies. MOPS assemblies, which integrate the merits of both the natural polyphenols and metal nanoclusters, possess excellent solubility, stability, and free radical scavenging capacity in aqueous solutions and enable further functional material engineering via polyphenol chemistry.

    • Qiong Dai
    • , Tong Shu
    •  & Xueji Zhang

  • Article
    | Open Access

    We developed all-solution-processed broadband photodetectors based on the wafer-scale perovskite quantum dots (PQDs)/MoS2 through light management via the monochromatization effect of the PQDs. The rational nanohybrid-based photodetectors exhibited broadband photodetection behavior that retained high photocurrents over a wide spectral range and also show superb air stability and exceptional bending durability.

    • Minji Kim
    • , Garam Bae
    •  & Sun Sook Lee

  • Article
    | Open Access

    Solid-phase crystallized Ce and H codoped In2O3 (ICO:H) transparent conducting films achieve very high electron mobility values of over 100 cm2/Vs and suitable low-carrier concentration, leading to high electrical conductivity and broadband optical transparency. However, a high-temperature annealing process for solid-phase crystallization is necessary to obtain high mobility. Therefore, such a high processing temperature limits the formation and adoption of these films on heat-sensitive flexible substrates. Herein, we used excimer laser irradiation to achieve an ICO:H film on flexible polyethylene terephthalate that had ultrahigh mobility of 133 cm2/Vs, which is the highest among those reported for flexible transparent electrodes.

    • Junichi Nomoto
    • , Takashi Koida
    •  & Tetsuo Tsuchiya

  • Article
    | Open Access

    Self-propelled amorphous, cubic, and tetrahedral Ag3PO4 micromotors were synthetized using a scalable precipitation method for antibacterial applications. Their programmable morphologies exhibited different motion properties under fuel-free and surfactant-free conditions and visible light irradiation. Differences in these motion properties were observed according to morphology and correlated with photocatalytic activity. Ag3PO4 micromotors are inherently fluorescent. The as-prepared self-propelled particles exhibited morphologically dependent antibiofilm activities toward eradication of gram-positive and gram-negative bacteria.

    • Daniel Rojas
    • , Michaela Kuthanova
    •  & Martin Pumera

  • Article
    | Open Access

    Plasmonic thin-layer chromatography was developed for the separation of quantum dots (QDs) by combining plasmonic optical trapping with thin-layer chromatography (TLC). Photoexcitation of the localized surface plasmon resonance of Au nanoparticles immobilized on a TLC plate decreased the distance traveled by QDs, enabling size separation of QDs with identical compositions and sorting of QDs according to the optical properties of QDs with the same size. Optical property-based separation cannot be achieved by conventional chromatography, in which the interactions between stationary phases of chromatographs and QDs are simply based on the differences in the size or surface functionality of QDs.

    • Tsukasa Torimoto
    • , Naoko Yamaguchi
    •  & Yasuyuki Tsuboi

  • Article
    | Open Access

    Charge carrier modulation in graphene by proximate ferroelectricity has attracted much attention, but it was rarely successful especially for oxide ferroelectrics mainly due to uncontrolled interfacial charge traps. In this work, the device operation of field–effect transistor comprising of graphene and ferroelectric single-crystal Pb(Mg1/3Nb2/3)O3–PbTiO3 was carefully analyzed for studying the direct or indirect coupling phenomena between charge carriers in graphene and nearby ferroelectricity.

    • Nahee Park
    • , Hyunkyung Lee
    •  & Dongseok Suh

  • Article
    | Open Access

    Stickable light-emitting diodes (LEDs) were fabricated by selectively growing GaN micro-LEDs on a graphene sheet. Using the van der Waals interaction of the bottom graphene layer, the micro-LED/graphene heterostructures uniformly adhered to foreign graphene films. The transferred LEDs were fully operational and maintained good mechanical adhesion and electrical connections to the foreign graphene films under various bending conditions. Since the van der Waals integration method provides simple assembly processes of heterogeneous materials with negligible material compatibility issues, the LED/graphene heterostructure will be capable of integrating with various 2D devices.

    • Anuj Kumar Singh
    • , Kwangseok Ahn
    •  & Kunook Chung

  • Article
    | Open Access

    Sialylated glycans (SGs), abundant in cell membranes, play decisive roles in regulating ion channels (e.g., NaV1.4, KV1.1, CaV1.2) in life system, only when the ion channels work stably and accurately can life activities proceed normally. Here we construct a biomimetic SG-modulated nanochannel based on a smart polymer design. Carbohydrate‒carbohydrate interaction triggers globule-to-coil transition of the polymer chains, which regulated the dynamic ion gating behavior of this nanochannel, resulting in a significant reduction in transmembrane ionic current. This device exhibits excellent specificity and sensitivity in response to α-2,6-linked sialyllactose, further realizing real-time monitoring of the sialylation reaction catalyzed by α2,6-sialyltransferase.

    • Jie Xiao
    • , Wenqi Lu
    •  & Guangyan Qing

  • Article
    | Open Access

    We synthesized small-sized ion doped PEDOT-Ag quantum dot (S-PEDOT-Ag QD) composite film via one-step vapor phase polymerization (VPP) using a novel Ag(I) salt precursor. The films exhibit enhanced thermoelectric performance and good antibacterial activity at low Ag loadings. This facile approach provides new route to synthesize high performance conducting polymer–inorganic composite.

    • Wei Shi
    • , Qin Yao
    •  & Lidong Chen

  • Article
    | Open Access

    Two-dimensional distorted orthorhombic GeS microribbons has been synthesized applying vapor-liquid-solid and vapor-solid mechanism-based chemical vapor transport. Polarized Raman and photoluminescence characterizations show the significantly angle-dependent intensity and anisotropic optical properties. Additionally, we probed the anisotropic electric properties by fabricating back-gate cross-shaped field effect transistors. In-plane direct current measurement demonstrated the charge carrier transport anisotropy and its anisotropic current ratio can be linearly adjusted by changing the gate voltage under dark and illumination conditions.

    • Zhangfu Chen
    • , Woohyun Hwang
    •  & Heon-Jin Choi

  • Article
    | Open Access

    A novel technique is demonstrated for the fabrication of individually addressable, high-density, flexible pressure sensor arrays composed of 1D ZnO nanotubes on graphene. The individually addressable pixel matrix was fabricated by arranging the top and bottom electrodes of the sensors in a crossbar configuration. A high spatial resolution of 1058 dpi was achieved for a Schottky diode-based force/pressure sensor composed of piezoelectric ZnO nanotubes on a flexible substrate.

    • Junbeom Park
    • , Ramesh Ghosh
    •  & Gyu-Chul Yi

  • Article
    | Open Access

    In this work, we systematically study heat conduction in SiC nanostructures, including nanomembranes, nanowires, and phononic crystals. Our measurements show that the thermal conductivity of nanostructures is several times lower than that in bulk and the values scale proportionally to the narrowest dimension of the structures. Additionally, we probed phonon mean free path and coherent heat conduction in these nanostructures. Our theoretical model links the observed suppression of heat conduction with the surface phonon scattering, which limits the phonon mean free path and thus reduces the thermal conductivity.

    • Roman Anufriev
    • , Yunhui Wu
    •  & Masahiro Nomura

  • Article
    | Open Access

    In this study, regulating composition and morphology of the trimetallic Co-Ni-Ru sulfoselenide and bimetallic sulfoselenide nanosheets are designed for efficient and durable OER electrocatalysts. The sheet structure has a large specific surface area to promote the contact between the catalyst and the electrolyte. Density functional theory (DFT) calculations show that appropriate Ru and Ni doping simultaneously (Co-Ni-Ru-S-Se) can increase the density of states of the Fermi level, resulting in excellent charge density and low intermediate adsorption energy.

    • Wei Deng
    • , Wenshuo Xie
    •  & Fei Jiang

  • Article
    | Open Access

    The multifunctional soft sensors attached to the glove are capable of simultaneously sensing six stimuli, including pressure, bending strain, temperature, proximity, UV light, and humidity, with high accuracy and without interference among the respective built-in components. The sensor is fabricated via supersonic spraying using silver nanowires, carbon nanotubes, zinc oxide, and conducting polymer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate.

    • Hong Seok Jo
    • , Chan-Woo Park
    •  & Sam S. Yoon

  • Article
    | Open Access

    A multifunctional plasmonic nanoplatform inspired from chameleon skin is developed for the purpose of glucose sensing applications in body fluids. Fabricated nanoplatforms consisted of two outer layers of fully-crosslinked P(NIPAAm-co-NIPMAAm) hydrogel embedded with plasmonic silver nanocubes, while the inner layer is an electrospun nanofibrous mat of PCL/PEO. Morphological and optical investigation on layers of the platform as well as the whole structure shows the well-fabricated structure offering a compact and stable device. The platform provides fast photothermal-responsivity, mechanical and antibacterial properties as well as sensing features, which can be used to anticipate glucose levels in body fluids in both ranges of healthy and diabetic.

    • Yasamin Ziai
    • , Francesca Petronella
    •  & Filippo Pierini

  • Article
    | Open Access

    (Left) Schematic diagrams describing a single in-situ chemical-vapor-deposition process for growing two-dimensional Janus MoSSe without initial or follow-up treatments and the growth mechanism consisting of three steps; 1) growth of a MoS2 layer, 2) formation of vacancies on the top MoS2 layer by an annealing effect, and filling of Se atoms in the vacancies. (Right) Optical-microscopy and photoluminescence-mapping images for a typical two-dimensional Janus sample showing that the central MoSSe region is distinguished from the peripheral MoSe2 region.

    • Chan Wook Jang
    • , Won Jun Lee
    •  & Suk-Ho Choi

  • Article
    | Open Access

    This work presents a polymer-matrix composite filled with BaTiO3@TiO2 nanosheets for tailoring the energy density. Due to the fact that TiO2 possesses the intermediate dielectric constant between that of BaTiO3 and the polymer matrix thus it reduces the interface charges, and also, the large aspect ratio of nanosheets enhance the ping-pong-like electron area scattering, as a result, significantly enhanced breakdown strength and energy density are fulfilled in the composite, with high potentials in electrostatic energy storage capacitors.

    • Gang Jian
    • , Yong Jiao
    •  & Ching-Ping Wong

  • Article
    | Open Access

    In this study, we present a novel nanoparticle with a nanoneedle-assembled shell and a magnetic core, which has great advantages over other materials used for exosome enrichment. Besides, the potential value of this nanoparticle in the enrichment and assay of exosomes has not been studied yet. The bio-inspired hierarchical nanoparticles could serve as an excellent platform for the effective capture and detection of exosomes. Thus, we believe that these novel nanoparticles are promising candidates for biological isolation and tumor diagnosis.

    • Wenjun Yang
    • , Yunru Yu
    •  & Yuanjin Zhao

  • Article
    | Open Access

    We investigate how random scattering modulates the optical properties, from terahertz to ultraviolet, of a three-dimensional graphene network based on interconnected high-quality 2-Dimensional graphene layers. We show how the connectivity and morphology of these materials allow a broadband interaction with light. The 3D graphene networks behave like a high-pass optical filter due to spatially multiscale random scatterers, corresponding to pores and graphene branches in the 3D network. We develop a model based on the Radiative Transfer theory describing the interaction of the network with light, from which we estimate the photon scattering mean free path.

    • Luca Tomarchio
    • , Salvatore Macis
    •  & Stefano Lupi

  • Article
    | Open Access

    A large-scale and ultrafast combustion synthesis using CO2 as feedstock is demonstrated for the fabrication of nitrogen-enriched graphene frameworks (NGF) with high electrical conductivity, which delivers an upgraded kinetics due to the enhanced ion diffusion and electron transport. Lithium-ion capacitors based on NGF as both cathode and anode exhibit a high gravimetric energy density of 151 Wh kg−1 and power output of 49 kW kg−1. This study reveals an effective pathway to achieve synergistic kinetics in electrode materials for high-performance electrochemical energy storage.

    • Chen Li
    • , Xiong Zhang
    •  & Yanwei Ma

  • Article
    | Open Access

    A novel technique is demonstrated for the fabrication of flexible and highly sensitive 1D piezoelectric pressure sensors containing ZnO nanotube arrays grown on 2D graphene layers. Due to the morphology-controlled tunable sensitivity, ultra-small size, and capability of detecting extremely low pressures, the sensors are able to efficiently detect human breath and pulse.

    • Jun Beom Park
    • , Minho S. Song
    •  & Gyu-Chul Yi

  • Article
    | Open Access

    Experimental descriptions of Aβ oligomers (oli-Aβs) assembled on surfaces as compared with Aβ monomers (mono-Aβs) are crucial to understanding changes in chemical reactivity. Here, we fabricated Aβ molecular junctions between linker molecular layered electrodes using different Aβ segments and report that electron transport pathways changed from asymmetric hopping across monomeric Aβ junctions to symmetric tunneling across oligomeric Aβ junctions.

    • Sohyeon Seo
    • , Jinju Lee
    •  & Hyoyoung Lee

  • Article
    | Open Access

    With the assistant of heat, the osmotic power generator with nanofluidic sulfonated poly(ether ether ketone)/poly(ether sulfone) membrane and high soluble lithium bromide shows excellent ion transport behavior and superior output power density for salinity gradient energy harvesting.

    • Yue Sun
    • , Yadong Wu
    •  & Liping Wen

  • Article
    | Open Access

    The mechanisms involved in the damage of CVD-grown graphene (Gr) and MoS2 are investigated during a roll-based transfer process. We identify two different damage mechanisms, i.e., instability-induced damage and tensile strain-induced damage. The two mechanisms compete, depending on the thickness of the transfer medium, and induce dissimilar damage. By optimizing the thickness, we realize and demonstrate the damage-free transfer of 2D materials. The sheet resistance and mobility of transferred Gr are 235 ± 29 Ω sq–1 and 2250 cm2 V–1 s–1, respectively, with no microscopic cracks or tear-out damage.

    • Chan Kim
    • , Min-Ah Yoon
    •  & Kwang-Seop Kim

  • Article
    | Open Access

    Metallic phase transition metal dichalcogenides quantum dots show different pathways of optical charge excitation and decay according to the size and sort of defects, resulting into the large Stoke shift, two bands for charge excitation, and TRPL peak shift. This result is mainly ascribed to the valance band splitting and the emerging defect states originated from atomic vacancy of basal plane and edge oxidation.

    • Bo-Hyun Kim
    • , Min-Ho Jang
    •  & Sung-Ho Song

  • Review Article
    | Open Access

    This review encompasses syntheses, characterizations, and applications of InP magic-sized clusters (MSCs) which are originally found as intermediates during the growth of InP quantum dots (QDs). Various tools to characterize MSCs and the intermediate characteristics of InP MSCs and InP MSCs having incorporated heterogeneous atoms such as chlorine or zinc are discussed. Developments in the syntheses of InP QDs and MSC-mediated growth mechanisms involving fragments, monomers or other nanoclusters are also addressed.

    • Yongju Kwon
    •  & Sungjee Kim

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