Individual Bi2S3 nanowire-based room-temperature H2 sensor
Individual Bi2S3 nanowire-based room-temperature H2 sensor
复制标题
基于 Bi2S3 纳米线的单独室温 H2 传感器
DOI：
10.1021/jp8022293
复制
发表时间：
2008-06-12
影响因子：
3.7
通讯作者：
Peng, L. -M.
中科院分区：
文献类型：
--
作者：
Yao, K.;Gong, W. W.;Peng, L. -M.
采用聚焦离子束技术沉积存款Pt电极制备了Bi 2S 3单纳米线器件。获得了可重复和可靠的欧姆接触。该器件表现出出色的H-2传感性能，可以在室温下检测H2（以N-2计），在10 ppm（相当于4.0 x 10（-7）mol/L）下的灵敏度为22%。在纳米线表面修饰Pd纳米颗粒并不能提高传感性能，这与大多数现有的纳米线（或纳米管）H-2传感器相反。Bi_2S_3纳米线器件的传感机理与其他纳米线或纳米管传感器不同。不同H2浓度和气体压力的实验表明，传感响应主要取决于H2分子的数量，而不是混合气体中H2的比例。
Single Bi2S3 nanowire devices were fabricated using the focused ion beam technique to deposit Pt electrodes. Repeatable and reliable ohmic contacts were obtained. The devices exhibit outstanding H-2 sensing performance that can detect H2 (in N-2) at room temperature with a sensitivity of 22% at 10 ppm (corresponds to 4.0 x 10(-7) mol/L). Decorating Pd nanoparticles on the surface of the nanowire does not improve the sensing performance, contrary to most of the existing nanowire (or nanotube) H-2 sensors. The sensing mechanism of Bi2S3 nanowire devices is found to be different from that of other sensors based on nanowires or nanotubes. Experiments on different H-2 concentrations and gas pressures suggest that the sensing response is determined mainly by the amount of H-2 molecules instead of the proportion of H-2 in the mixed gas.