THIS MONTH IN NPG ASIA MATERIALS

Volume 7, June 2015

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June 26 2015

Original Article

Three-dimensional-networked NiCo2S4 nanosheet array/carbon cloth anodes for high-performance lithium-ion batteries

Rujia Zou, Zhenyu Zhang, Muk Fung Yuen, Mingliang Sun, Junqing Hu, Chun-Sing Lee and Wenjun Zhang

NPG Asia Mater 7: e195; doi:10.1038/am.2015.63

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3D Networked NiCo2S4 nanosheet array/carbon cloth composites are synthesized by a facile hydrothermal reaction and subsequent sulfurization process, and the rational material composition and structure design lead to their outstanding overall performance as an anode material in lithium-ion batteries.

Original Article

Microstructure-dependent DC set switching behaviors of Ge–Sb–Te-based phase-change random access memory devices accessed by in situ TEM

Kyungjoon Baek, Kyung Song, Sung Kyu Son, Jang Won Oh, Seung-Joon Jeon, Won Kim, Ho Joung Kim and Sang Ho Oh

NPG Asia Mater 7: e194; doi:10.1038/am.2015.49

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Applying in situ TEM techniques to GST-based vertical PCRAM cells, we directly observed the DC set switching process of real devices for the first time. The results show that the microstructure of crystalline GST matrix is an important structural parameter determining the local temperature distribution. In the case of highly crystallized GST matrix, the device failure occurred via two-step void formation due to the polarity-dependent electromigration.

Review

Advanced analytical electron microscopy for lithium-ion batteries

Danna Qian, Cheng Ma, Karren L More, Ying Shirley Meng and Miaofang Chi

NPG Asia Mater 7: e193; doi:10.1038/am.2015.50

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This review highlights the recent developments and contributions of advanced electron microscopy studies to the research of lithium-ion battery materials. Both static, ex situ studies and newly developed in situ AEM techniques are emphasized, and future directions are also proposed.

Corrigendum

Spatial regulation of synthetic and biological nanoparticles by DNA nanotechnology

Zhongqiang Yang, Huajie Liu and Dongsheng Liu

NPG Asia Mater 7: e192; doi:10.1038/am.2015.59

Research Highlight

The rise of silicene

Michel Houssa

NPG Asia Mater 7: e191; doi:10.1038/am.2015.60. Published online   

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June 12 2015

Original Article

Novel high-κ dielectrics for next-generation electronic devices screened by automated ab initio calculations

Kanghoon Yim, Youn Yong, Joohee Lee, Kyuhyun Lee, Ho-Hyun Nahm, Jiho Yoo, Chanhee Lee, Cheol Seong Hwang and Seungwu Han

NPG Asia Mater 7: e190; doi:10.1038/am.2015.57

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Novel high-κ dielectric materials are identified by automated ab initio calculations on ~1800 oxides. The cubic BeO is found to possess an unprecedented material property of 10eV for band gap and 275 for dielectric constant. Candidate high-κ oxides are suggested for microelectronic devices such as CPU, DRAM and flash memory.

Original Article

Flexible organic ferroelectric films with a large piezoelectric response

Wenxiu Gao, Lei Chang, He Ma, Lu You, Jiang Yin, Junming Liu, Zhiguo Liu, Junling Wang and Guoliang Yuan

NPG Asia Mater 7: e189; doi:10.1038/am.2015.54

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The transparent C3N2H5ClO4 ferroelectric film on ITO coated PET substrate can be bent to 3.1mm radius without affecting its ferroelectric properties. Furthermore, its local piezoelectric response is comparable to that of Pb(Zr0.2Ti0.8)O3 film.

Original Article

Compact helical antenna for smart implant applications

Dmitriy D Karnaushenko, Daniil Karnaushenko, Denys Makarov and Oliver G Schmidt

NPG Asia Mater 7: e188; doi:10.1038/am.2015.53

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We fabricated compact helical antenna operating in the industry-scientific-medical radio band. With a total length of only 5.5mm, it is about five times smaller compared with the conventional dipole antenna. The transmission and receiving signals between helical antennas and the communication between a helical antenna and a smartphone is reported. Owing to the shape and dimensions, we successfully demonstrate the possibility to address the antenna, when embedded in a tooth, as well as to implant the antenna using standard medical syringes. These demonstrations highlight the potential of helical antennas for medical applications as components of smart system implants.

Original Article

Nanoporous-gold-based composites: toward tensile ductility

Ke Wang, Aaron Kobler, Christian Kübel, Hans Jelitto, Gerold Schneider and Jörg Weissmüller

NPG Asia Mater 7: e187; doi:10.1038/am.2015.58

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Nanoporous metals made by dealloying can take the form of macroscopic bodies that exhibit a uniform and highly interconnected network of nanoscale ‘ligaments’. Our study used this material as the reinforcement phase in novel interpenetrating-phase nanocomposites. Tensile tests on our cm-sized composite samples for the first time demonstrate tensile ductility in a nanoporous-metal-based material. Whereas the strength, σ, of pure nanoporous metal scales with the phase faction, ϕ, as σ ϕ3/2, the composite has a linear scaling relation σ ϕ that favors strengthening at small solid fraction. We find this strengthening also in quantitative agreement with the data behind the well-known ‘smaller is stronger’ of metal nanostructures. Thus, our material’s design strategy exploits the high strength of individual metal nano-objects such as nanowires for making a strong and ductile material from which macroscopic things can be formed.

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June 05 2015

Review

Chemically converted graphene: scalable chemistries to enable processing and fabrication

Sanjeev Gambhir, Rouhollah Jalili, David L Officer and Gordon G Wallace

NPG Asia Mater 7: e186; doi:10.1038/am.2015.47

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The development of scalable chemistries for the production and processing of graphene is essential if its potential in structures and devices is to be realized. This review is a chemist’s perspective on the methods developed for the production of processable graphene and graphene precursors dispersion, their integration into polymers and fabrication into a variety of structures.

Research Highlight

Self-organized templates provide backbone for all integrated Li-ion batteries

Kiyoung Lee and Patrik Schmuki

NPG Asia Mater 7: e185; doi:10.1038/am.2015.44. Published online   

Original Article

Nanosheet transfection: effective transfer of naked DNA on silica glass

Nien-Chi Huang, Qingmin Ji, Katsuhiko Ariga and Shan-hui Hsu

NPG Asia Mater 7: e184; doi:10.1038/am.2015.43

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A nanosheet structure on a glass plate can transfer naked DNA into difficult-to-transfect cells (for example, stem cells) in limited time after contact (‘transfection window’) without any vector. The transfected cells express the specific proteins a week later. The gene uptake and expression are associated with the cytoskeleton arrangement on the silica nanosheets by activating the cell-membrane integrin receptor.

Original Article

Ultra-small, size-controlled Ni(OH)2 nanoparticles: elucidating the relationship between particle size and electrochemical performance for advanced energy storage devices

Rutao Wang, Junwei Lang, Yonghuan Liu, Zongyuan Lin and Xingbin Yan

NPG Asia Mater 7: e183; doi:10.1038/am.2015.42

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Ultra-small Ni(OH)2 nanoparticles with different average sizes are prepared in large scale, and the best electrochemical performance is obtained at the critical size rather than the smallest size, which provides a new insight on nanosize effect on electrode materials in energy storage.

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