Research articles

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  • Ba0.95La0.05SnO3 epitaxial films grown on (0001)-oriented Al2O3 with a BaZrO3/MgO template bilayer exhibit lower sheet resistance by three orders of magnitude compared with template-free films. These epitaxial films with single-crystalline level properties, including high ultraviolet‒visible transmittance (~82%) and high electromagnetic shielding effectiveness (~18.6 dB at 10 GHz), can be used for the development of stable and inexpensive optoelectronic and energy applications of epitaxial BLSO films grown on Al2O3.

    • Youngkyoung Ha
    • Jingyeong Jeon
    • Shinbuhm Lee
    ArticleOpen 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
    ArticleOpen Access
  • Inspired by Bouligand structure in the dactyl club of the mantis shrimp, direct ink writing is used to 3D print Bouligand composites reinforced with glass microfibres at controllable pitch angles. The Bouligand composites with a pitch angle of 40˚ exhibited a maximum energy absorption of 2.4 kJ/m2, which was 140 % higher than the unidirectional composites. The topography of the fractured surface supplemented with numerical simulations revealed the combination of crack twisting and crack bridging mechanisms. These findings have implications for the microstructural design of engineered composites using direct ink writing for applications in aerospace, transportation, defense, etc.

    • Lizhi Guan
    • Weixiang Peng
    • Hortense Le Ferrand
    ArticleOpen Access
  • In this work, by involving high-energy scanning X-ray diffraction strain mapping, we identify and distinguish between structural and elastic heterogeneity in the extremely rejuvenated metallic glasses under triaxial compression. Microindentation hardness hints at an unsymmetrical hardening/softening picture and further reveals the complementary effects of stress and structure modulation. Our results suggest that simultaneous stress and structural modulation can be used to enhance rejuvenation beyond the limits known to date, and may therefore aid in the design of MGs with enhanced ductility and strain-hardening capability.

    • Daniel Şopu
    • Florian Spieckermann
    • Jürgen Eckert
    ArticleOpen Access
  • III-V commercial optical semiconductor GaP crystalizes in either zincblende or wurtzite structure at ambient pressure. Zincblende GaP transforms into orthorhombic phase across a critical pressure during compression, accompanying piezochromic transition, metallization and superconductivity. Upon decompression, superconductivity could be preserved toward ambient pressure and displays broadening features due to amorphization. It reveals the presence of two high-pressure superconducting phases.

    • Nixian Qian
    • Chunhua Chen
    • Zhaorong Yang
    ArticleOpen Access
  • A molecular imaging-based strategy was proposed for precise diagnosing the depression through specifically visualizing the inflammation status associated with depressed brain. The inflammation-targeting MRI nanoprobe that can specifically target the inflamed vascular endothelial cells was constructed through attaching the ICAM-1 targeting peptides on biocompatible Fe3O4 nanoparticle. Through nanoprobe-based SWI, the spatial distribution of inflammation in depressed brain can be mapped in vivo. This strategy not only facilitate insight into the biological mechanism underlying depression, but also provide a target within the depressed brain for the further development of anti-inflammatory therapies.

    • Peisen Zhang
    • Jiaoqiong Guan
    • Yue Lan
    ArticleOpen Access
  • We present a strategy for significantly increasing the H contents on catalysts for the HER in alkaline electrolyte solutions, which were generated by combining ruthenium with HxYO2x on an oxygen vacancy-rich graphene system. This strategy greatly increased the hydrogen coverage on the RuYO2x/C catalyst to enhance the HER performance.

    • Xiang Li
    • Wei Deng
    • Fei Jiang
    ArticleOpen Access
  • The rise of three-dimensional topological insulators as an attractive playground for the observation and control of various spin-orbit effects has ushered in the field of topological spintronics. To fully exploit their potential as efficient spin-orbit torque generators, investigating the efficiency of spin injection and transport at various topological insulator/ferromagnet interfaces is crucial. Here, using all-optical time-resolved magneto-optical Kerr effect magnetometry, we demonstrate efficient room-temperature spin pumping in Sub/BiSbTe1.5Se1.5(BSTS)/Co20Fe60B20(CoFeB)/SiO2 thin films characterized by the spin-mixing conductances of the interface and the spin diffusion length in BSTS, and obtain an ultrahigh interfacial spin transparency.

    • Suchetana Mukhopadhyay
    • Pratap Kumar Pal
    • Anjan Barman
    ArticleOpen 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
    ArticleOpen 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
    ArticleOpen Access
  • We observed a pressure-induced semiconductor-metal transition, which was followed by the emergence of superconductivity in the nonsymmorphic topological insulator KHgAs. The superconducting transition temperature reaches a maximum of approximately 6.6 K at 31.8 GPa, after which it slightly decreases up to 55 GPa. We identified the pressure-induced phase transitions and determined the structures of three high-pressure phases of KHgAs through structure prediction. Our findings establish the high-pressure phase diagram of the hourglass fermion compound KHgAs and demonstrate the potential coexistence of superconductivity with a topologically nontrivial feature protected by nonsymmorphic symmetries.

    • Guangyang Dai
    • Yating Jia
    • Changqing Jin
    ArticleOpen Access
  • The low coercivity in Nd-Fe-B-based magnets, which is limited to around 20% of the anisotropy field (HA) of the main phase, is a bottleneck for their usage at elevated temperatures. Herein, we overcome the limit and demonstrate a coercivity of 40% HA by tuning the magnetism of grain boundaries, enabling their applications at elevated temperatures.

    • Xin Tang
    • Jiangnan Li
    • Kazuhiro Hono
    ArticleOpen Access
  • A two-dimensional array of magnetostrictive nanomagnets was used to demonstrate strong coupling between two different magnons (kM1′ and kM1′′) mediated by a phonon (kph). The coupling is strong, leading to the formation of a new quasi-particle – binary magnon-polaron. These two different magnons show 180° phase difference which is reminiscent of dark magnon modes. We show that it is possible to engineer this magnon-phonon coupling by choosing the frequency and wavelength of the acoustic wave to match the frequency and wavelength of the spin wave, the latter being controlled by a magnetic field.

    • Sudip Majumder
    • J. L. Drobitch
    • Anjan Barman
    ArticleOpen Access
  • This work presents a design guide for anlog memristive devices for artificial synapses in neuromorphic computing. Ge implanted a-Si serves multiple fuctions to induce multifilamentary switching and prevent silicide formation. The linear synapse update behaviors were observed thanks to multi-filament formation, which was confirmed by TEM.

    • Keonhee Kim
    • Jae Gwang Lim
    • Inho Kim
    ArticleOpen 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
    ArticleOpen Access
  • We evaluated the liquid fragility and structural and dynamic heterogeneity of glassy solids. The most fragile alloy exhibited the maximum dynamic heterogeneity in the mechanical unfreezing process. We observed that atomic displacement significantly correlated with degrees of clustering of local atomic orders. The clustering produced during the glass-forming quenching process enhanced structural and dynamic heterogeneities. Therefore, there are correlations among liquid fragility, dynamic heterogeneity in liquid alloys, and dynamic and structural heterogeneities in glassy solids. In addition, the alloy with the most fragility exhibited the largest difference in atomic mobility between the densely and loosely packed local atomic orders.

    • Masato Wakeda
    • Tetsu Ichitsubo
    ArticleOpen Access
  • A liquid–solid dual-phase magnetoactive microlattice metamaterial composed of flexible 3D-printed polymer shell and magnetorheological (MR) fluid has been designed and fabricated. The MR fluid-filled magnetoactive microlattices demonstrated remarkable recoverability (~50%) and be substantially stiffened in the presence of a magnetic field, with an ~200% increment in stiffness at 60 mT. Based on specific applications, the mechanical properties of this magnetoactive microlattice metamaterial can be modulated on demand, leading to certain programmable stress-strain behavior.

    • Wenqiang Zhang
    • Jingzhuo Zhou
    • Yang Lu
    ArticleOpen Access
  • Drawing inspiration from the structural attributes of mussels, we have introduced a riveting layer into our hydrogel-plastic hybrids, facilitating robust bonding between hydrogel networks and plastic substrates. This work underscores the immense potential and advantages that this integration of hydrogels and plastics holds, especially in the development of intelligent robotics.

    • Zhixuan Wen
    • Teng Zhou
    • Lei Jiang
    ArticleOpen 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
    ArticleOpen Access