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Effects of pores and temperature on mechanics of gold nanowires using molecular dynamics
Shen-Yung Lin,Tong Hong Wangs,Te-Hua Fang,Wen-Li Chen 한국물리학회 2010 Current Applied Physics Vol.10 No.1
The deformation mechanisms of gold nanowires with different nanopores under tension were simulated by molecular dynamics (MD). The stress–strain curves varied from different porous defects, and the tension caused dislocations to take place and slip along plane (1 1 1). Moreover, the tensile strength of the nanoporous monocrystalline gold was decreased when the simulated temperature increased. The stress concentrations factors of porous nanowires were calculated, and it was found that there was a great influence of size and model effects on the stress concentration factors.
Vapour–liquid–solid growth of monolayer MoS<sub>2</sub> nanoribbons
Li, Shisheng,Lin, Yung-Chang,Zhao, Wen,Wu, Jing,Wang, Zhuo,Hu, Zehua,Shen, Youde,Tang, Dai-Ming,Wang, Junyong,Zhang, Qi,Zhu, Hai,Chu, Leiqiang,Zhao, Weijie,Liu, Chang,Sun, Zhipei,Taniguchi, Takaaki,Os Nature Publishing Group UK 2018 Nature Materials Vol.17 No.6
<P>Chemical vapour deposition of two-dimensional materials typically involves the conversion of vapour precursors to solid products in a vapour-solid-solid mode. Here, we report the vapour-liquid-solid growth of monolayer MoS2, yielding highly crystalline ribbons with a width of few tens to thousands of nanometres. This vapour-liquid-solid growth is triggered by the reaction between MoO3 and NaCl, which results in the formation of molten Na-Mo-O droplets. These droplets mediate the growth of MoS2 ribbons in the 'crawling mode' when saturated with sulfur. The locally well-defined orientations of the ribbons reveal the regular horizontal motion of the droplets during growth. Using atomic-resolution scanning transmission electron microscopy and second harmonic generation microscopy, we show that the ribbons are grown homoepitaxially on monolayer MoS2 with predominantly 2H-or 3R-type stacking. Our findings highlight the prospects for the controlled growth of atomically thin nano-structure arrays for nanoelectronic devices and the development of unique mixed-dimensional structures.</P>
Wen-Jie Zou,Chin-Wei Huang,Yung-Ho Chiu,Neng Shen,Shu-Mei Wang 기술경영경제학회 2016 ASIAN JOURNAL OF TECHNOLOGY INNOVATION Vol.24 No.3
This study uses the dynamic data envelopment analysis (DEA) model to evaluate intertemporalefficiency for high-tech industries in China. The significant difference from previous studies isthe assumption for patents, which are defined to be a carry-over intermediate linking differentterms. The model further provides an indicator of adjustment ratio for patents, based on theassessment of optimal quantity of patents. Output and input inefficiency indicators are alsodeveloped in the model to explore the sources of operational inefficiency. The empiricalresults conclude that intertemporal efficiency trends upward over time; the quantity ofpatents is assessed to be in shortage during the early terms, but excessive in recent terms;and that deficits in financial output is a significant factor in creating inefficiency.