Kim Kyoungwon, Lee Deuk-Hee, Jeong Dawoon, Debnath Pulak Chandra, Lee Dong-Yun, Kim Sangsig, Lee Sang Yeol
Electronic Materials Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Korea.
J Nanosci Nanotechnol. 2012 May;12(5):4211-4. doi: 10.1166/jnn.2012.5936.
Sensitivity-customization of zinc oxide (ZnO) nanowire (NW) gas sensors has been demonstrated by controlling Ga-doping, thereby tuning the resistance of the NWs. Both un-doped and 5 weight% Ga-doped ZnO (GZO) NWs are synthesized for the highly sensitive sensing within a narrow detection window and a less sensitive one within an expanded window, respectively. We have employed hot-walled pulsed laser deposition (HW-PLD) for the NW synthesis. With CO gas injection, the resistance reduction of NWs is detected and analyzed in a self-designed gas chamber that guarantees the precise control of gas flow and, gas concentration, as well as temperature. NW sensitivity is proportional to the sensing temperature and inversely proportional to the doping concentration resulting in widening the sensing window up to 230 times by the 5 wt.% Ga-doping.
通过控制镓掺杂来调整氧化锌（ZnO）纳米线（NW）气体传感器的灵敏度，从而调节纳米线的电阻。分别合成了未掺杂和5重量%镓掺杂的ZnO（GZO）纳米线，以在窄检测窗口内实现高灵敏度传感，在扩展窗口内实现低灵敏度传感。我们采用热壁脉冲激光沉积（HW-PLD）来合成纳米线。通过注入CO气体，在自行设计的气室中检测和分析纳米线的电阻降低情况，该气室可确保对气体流量、气体浓度以及温度进行精确控制。纳米线的灵敏度与传感温度成正比，与掺杂浓度成反比，5重量%的镓掺杂使传感窗口扩大了230倍。
