Yan Hongliang, Zhang Lan, Shen Jiaoyan, Chen Zhaojia, Shi Gaoquan, Zhang Binglin
Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China. Department of Chemistry, Beijing University of Science and Technology, Beijing 100083, People's Republic of China.
Nanotechnology. 2006 Jul 28;17(14):3446-50. doi: 10.1088/0957-4484/17/14/017. Epub 2006 Jun 20.
Polypyrrole nanowires have been electrosynthesized by direct oxidation of 0.1 mol l(-1) pyrrole in a medium of 75% isopropyl alcohol + 20% boron trifluoride diethyl etherate + 5% poly (ethylene glycol) (by volume) using porous alumina membranes as the templates. The as-prepared nanowires had a smooth surface and uniform diameter and were arranged in an orderly manner in a high density. The conductivity of a single nanowire was measured by the four-electrode technique to be 23.4 S cm(-1) at room temperature. The field emission devices based on the nanowire array were fabricated and their operations were explored. The experimental results indicated that the field emission characteristics of the devices fitted well to the Fowler-Nordheim model of emission. The turn-on electric field was only 1.2 V microm(-1) and the current density reached 200 microA cm(-2) at 2.6 V microm(-1).
通过在75%异丙醇+20%三氟化硼二乙醚+5%聚乙二醇（体积比）的介质中，以多孔氧化铝膜为模板，对0.1 mol l(-1)吡咯进行直接氧化，电合成了聚吡咯纳米线。所制备的纳米线表面光滑，直径均匀，高密度有序排列。采用四电极技术在室温下测得单根纳米线的电导率为23.4 S cm(-1)。制备了基于纳米线阵列的场发射器件并研究了其性能。实验结果表明，器件的场发射特性与Fowler-Nordheim发射模型拟合良好。开启电场仅为1.2 V microm(-1)，在2.6 V microm(-1)时电流密度达到200 microA cm(-2)。
