Field enhancement and field screening are two major factors affecting field emission performance of arrays of quasi one-dimensional nanostruetures. We have observed enhanced field emission from large-area arrays of W1...Field enhancement and field screening are two major factors affecting field emission performance of arrays of quasi one-dimensional nanostruetures. We have observed enhanced field emission from large-area arrays of W18O49 pencil-like nanostructure due to both the effects of high aspect ratio and enlarged spacing between neighboring nanostructures. These arrays may be grown on silicon substrates by the multi-step thermal evaporation process. The spacing of nanotip-to-nanotip between neighboring nanostruetures may be increased by adjusting the growth temperature. The arrays are observed to have a typical turn-on field as low as about 1.26 MV/m and a threshold field as low as about 3.39 MV/m, resulting in increasing field enhancement and decreasing field screening effect.展开更多
基金＊Supported by the National Natural Science Foundation of China under Grant Nos 50725206, 50802117, U0634002 and 50672135, the National Basic Research Program of China under Grant Nos 2003CB314701, 2007CB935501 and 2010CB327703, the National High-Tech Research and Development Program of China under Grant No2008AA03A314, the Doctoral Foundation of Education Ministry of China under Grant No 20070558063, the Science and Technology Department of Guangdong Province, the Department of Information Industry of Guangdong Province, and the Science and Technology Department of Guangzhou City.
文摘Field enhancement and field screening are two major factors affecting field emission performance of arrays of quasi one-dimensional nanostruetures. We have observed enhanced field emission from large-area arrays of W18O49 pencil-like nanostructure due to both the effects of high aspect ratio and enlarged spacing between neighboring nanostructures. These arrays may be grown on silicon substrates by the multi-step thermal evaporation process. The spacing of nanotip-to-nanotip between neighboring nanostruetures may be increased by adjusting the growth temperature. The arrays are observed to have a typical turn-on field as low as about 1.26 MV/m and a threshold field as low as about 3.39 MV/m, resulting in increasing field enhancement and decreasing field screening effect.
