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| 1 | Porous nitrogen-doped carbon/MnO coaxial nanotubes as an efficient sulfur host for lithium sulfur batteries显示文摘As a promising candidate for next generation energy storage devices, lithium sulfur (Li-S) batteries still confrant rapid capacity degradation and low rate capability. Herein, we report a well-architected porous nitrogen-doped carbon/MnO coaxial nanotubes (MnO@PNC) as an efficient sulfur host material. The host shows excellent electron conductivity, sufficient ion transport channels and strong adsorption capability for the polysulfides, resulting from the abundant nitrogen-doped sites and pores as well as MnO in the carbon shell of MnO@PNC. The MnO@PNC-S composite electrode with a sulfur content of 75 wt.% deliveries a specific capacity of 802 mAh·g^-1 at a high rate of 5.0C and outstanding cycling stability with a capacity retention of 82% after 520 cycles at 1.0C. | Chao Lin Longbing Qu Jiantao Li Zhengyang Cai Haoyun Liu Pan He Xu Xu Liqiang Mai | 2019 | Nano Research2019，12，1： | 10 |
| 2 | An efficient and fast polarity optimization approach for mixed polarity Reed-Muller logic circuits显示文摘尽管基因算法广泛地在混合极性芦苇思考(MPRM ) 逻辑电路的极性优化被使用了,很少研究考虑了极性变换顺序。以便改进 MPRM 逻辑电路的极性优化的效率,我们就极性变换顺序而言建议一条有效、快的极性优化途径(FPOA ) 。第一,在 FPOA 后面的主要想法是那等评估的极性集合的最好的极性变换顺序被使用建议混合基因算法(HGA ) 获得;第二,每在极性集合的极性根据 HGA 获得的最好的极性变换顺序被变换。我们的建议 FPOA 在 C 被实现,比较分析为 MCNC 基准电路被介绍了。试验性的结果证明为有更多的变量的电路, FPOA 在与极性变换顺序和改进极性优化与启发式的技术接近疏忽的传统的极性优化途径相比改进 MPRM 逻辑电路的极性优化的效率是高度有效的。 | Zhenxue HE Limin XIAO Fei GU Tongsheng XIA Shubin SU Zhisheng HUO Rong ZHANG Longbing ZHANG Li RUAN Xiang WANG | 2017 | Frontiers of Computer Science2017，11，4： | 6 |
| 3 | Alloyed Au-Ag nanorods with desired plasmonic properties and stability in harsh environments显示文摘Bio-chemical molecular detection in the nanoscale, based on alloyed nanorods(NRs) with tunable surface plasmon resonance(SPR) properties and high chemical stability, has attracted particular interest. In this work,alloyed Au-Ag NRs with tunable aspect ratios were achieved by annealing Au nanobipyramid-directed Au@Ag core-shell NRs. The core-shell NRs were encapsulated within mesoporous silica outer shells to avoid fusion or aggregation. The structural stability of fully alloyed Au-Ag NRs, including chemical and thermal stability, is remarkably improved compared with that of Au@Ag core-shell NRs. The alloyed NRs would maintain the rod-like structure after being incubated in etchant solution, while Au@Ag core-shell NRs would decay into nanobipyramids.Additionally, fully alloyed NRs present stable morphology under annealing at high temperatures of up to 600℃ in air. Benefiting from excellent structural and chemical stabilities, the surface-enhanced Raman scattering effect based on alloyed NRs is stable in harsh environments. Taking advantage of tunable SPR properties(600–1800 nm) and excellent stability, the obtained nanostructures can serve as drug carriers. The perfect photo-thermal effect induced by the particular SPR of alloyed NRs can improve the release efficiency of drugs. | Yuan Ni Caixia Kan Longbing He Xingzhong Zhu Mingming Jiang Daning Shi | 2019 | Photonics Research2019，7，5： | 3 |
| 4 | Stoichiometric effect on electrical and near-infrared photodetection properties of full-composition-range GaAs1−xSbx nanowires显示文摘As one of the most important narrow bandgap ternary semiconductors, GaAs1−xSbx nanowires (NWs) have attracted extensive attention recently, due to the superior hole mobility and the tunable bandgap, which covers the whole near-infrared (NIR) region, for technological applications in next-generation high-performance electronics and NIR photodetection. However, it is still a challenge to the synthesis of high-quality GaAs1−xSbx NWs across the entire range of composition, resulting in the lack of correlation investigation among stoichiometry, microstructure, electronics, and NIR photodetection. Here, we demonstrate the success growth of high-quality GaAs1−xSbx NWs with full composition range by adopting a simple and low-cost surfactant-assisted solid source chemical vapor deposition method. All of the as-prepared NWs are uniform, smooth, and straight, without any phase segregation in all stoichiometric compositions. The lattice constants of each NW composition have been well correlated with the chemical stoichiometry and confirmed by high-resolution transmission electron microscopy, X-ray diffraction, and Raman spectrum. Moreover, with the increase of Sb concentration, the hole mobility of the as-fabricated field-effect-transistors and the responsivity and detectivity of the as-fabricated NIR photodetectors increase accordingly. All the results suggest a careful stoichiometric design is required for achieving optimal NW device performances. | Jiamin Sun Mingming Han Meng Peng Lei Zhang Dong Liu Chengcheng Miao Jiafu Ye Zhiyong Pang Longbing He Hailu Wang Qing Li Peng Wang Lin Wang Xiaoshuang Chen Chongxin Shan Litao Sun Weida Hu Zai-xing Yang | 2021 | Nano Research2021，14，11： | 1 |
| 5 | EDOA: an efficient delay optimization approach for mixed-polarity Reed-Muller logic circuits under the unit delay model显示文摘Delay optimization has recently attracted signif-icant attention. However, few studies have focused on the delay optimization of mixed-polarity Reed-Muller (MPRM) logic circuits. In this paper, we propose an efficient delay op-timization approach (EDOA) for MPRM logic circuits under the unit delay model, which can derive an optimal MPRM logic circuit with minimum delay. First, the simplest MPRM expression with the fewest number of product terms is ob-tained using a novel Reed-Muller expression simplification approach (RMESA) considering don't-care terms. Second, a minimum delay decomposition approach based on a Huffman tree construction algorithm is utilized on the simplest MPRM expression. Experimental results on MCNC benchmark cir-cuits demonstrate that compared to the Berkeley SIS 1.2 and ABC, the EDOA can significantly reduce delay for most cir-cuits. Furthermore, for a few circuits, while reducing delay, the EDOA incurs an area penalty. | Zhenxue HE Limin XIAO Fei GU Li RUAN Zhisheng HUO Mingzhe LI Mingfa ZHU Longbing ZHANG Rui LIU Xiang WANG | 2019 | Frontiers of Computer Science2019，13，5： | 1 |
| 6 | Thermal stability of Te nanowires and their crystallographydetermined surface evolution at elevated temperatures显示文摘Nanowires are fantastic nanostructures for designing new functional devices because of their extraordinary properties.However,nanowires usually suffer pronounced size and surface effects with decreasing diameter size.Whether their structure and thermal stability can still fill the requirements of practical applications is a critical issue to be figured out.Herein,Te nanowires with diameters ranging from sub-10 to over 80 nm are used as samples to probe into this issue.In situ heating experiments are performed on these Te nanowires using an aberration-corrected transmission electron microscopy combined with a chip-based heating holder.It is found that Te nanowires suffer sublimation at elevated temperatures rather than melting,showing sizedependent sublimation scenarios.The Te nanowires with diameter smaller than 20 nm sublimate below 205℃,while the larger ones with diameter around 85 nm require a higher temperature of around 225℃.During sublimation-induced shape evolution,the interfacial wetting equilibrium and crystal orientations play critical roles,leading to the formation of spherical surfaces or featured facets at the free surfaces.A mean contact angle of 107.5°is determined at the C-Te interface when the crystalline Te nanowires stay in a quasi-liquid equilibrium state.However,once the crystalline feature is overwhelming,e.g.,at moderate temperatures,the(1011),(1120),and(1010)facets govern the free surface,despite the wetting condition at the interfaces. | Lei Shangguan Yating Ran Ziyu Lu Yutian Gao Lei Shi Longbing He Litao Sun | 2023 | Nano Research2023，16，4： | 0 |
| 7 | Surface-Condition-Dependent Deformation Mechanisms in Lead Nanocrystals显示文摘Serving as nanoelectrodes or frame units,small-volume metals may critically affect the performance and reliability of nanodevices,especially with feature sizes down to the nanometer scale.Small-volume metals usually behave extraordinarily in comparison with their bulk counterparts,but the knowledge of how their sizes and surfaces give rise to their extraordinary properties is currently insufficient.In this study,we investigate the influence of surface conditions on mechanical behaviors in nanometer-sized Pb crystals by performing in situ mechanical deformation tests inside an aberration-corrected transmission electron microscope(TEM).Pseudoelastic deformation and plastic deformation processes were observed at atomic precision during deformation of pristine and surface-oxidized Pb particles,respectively.It is found that in most of the pristine Pb particles,surface atom diffusion dominates and leads to a pseudoelastic deformation behavior.In stark contrast,in surface-passivated Pb particles where surface atom diffusion is largely inhibited,deformation proceeds via displacive plasticity including dislocations,stacking faults,and twinning,leading to dominant plastic deformation without any pseudoelasticity.This research directly reveals the dramatic impact of surface conditions on the deformation mechanisms and mechanical behaviors of metallic nanocrystals,which provides significant implications for property tuning of the critical components in advanced nanodevices. | Hongtao Zhangg Wen Wang Jun Sun Li Zhong Longbing He Litao Sun | 2022 | Research2022，，4： | 0 |
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