tailieunhanh - Báo cáo hóa học: " Field emission enhancement of Au-Si nano-particle-decorated silicon nanowires"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Field emission enhancement of Au-Si nano-particle-decorated silicon nanowires | Zhao et al. Nanoscale Research Letters 2011 6 176 http content 6 1 176 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Field emission enhancement of Au-Si nano-particle-decorated silicon nanowires Fei Zhao Guo-an Cheng Rui-ting Zheng Dan-dan Zhao Shao-long Wu Jian-hua Deng Abstract Au-Si nano-particle-decorated silicon nanowire arrays have been fabricated by Au film deposition on silicon nanowire array substrates and then post-thermal annealing under hydrogen atmosphere. Field emission measurements illustrated that the turn-on fields of the non-annealed Au-coated SiNWs were to V gm higher than that of the as-grown silicon nanowires which is about V gm. Meanwhile after being annealed above 650 C Au-Si nano-particles were synthesized on the top surface of the silicon nanowire arrays and the one-dimensional Au-Si nano-particle-decorated SiNWs had a much lower turn-on field V gm. The results demonstrated that annealed composite silicon nanowire array-based electron field emitters may have great advantages over many other emitters. Introduction Silicon is one of the most promising candidates and plays a significant role in the micro-electronic field. One-dimensional silicon nanowires SiNWs have been fabricated by many approaches such as chemical vapor deposition 1 laser ablation 2 thermal evaporation 3 chemical etching 4 5 methods etc. since they were first fabricated via the vapor-liquid-solid VLS mechanism 6 . Among the above mentioned methods for dealing with the challenges that the nanowires should grow aligned in the same direction with high purity chemical etching method is a simple and convenient way to fabricate pure well-aligned SiNWs. Fabrication of electron-emitting nano-materials 7-9 and application of electron field emitters on the flat panel displays 10 have attracted much attention on the studies of one-dimensional materials because of their advantages of high aspect ratio stable .