Intrinsic characteristic and mechanism in enhancing H2S sensing of Cd-doped α-MoO3 nanobelts
Intrinsic characteristic and mechanism in enhancing H2S sensing of Cd-doped α-MoO3 nanobelts
复制标题
Cd掺杂α-MoO3纳米带增强H2S传感的内在特性和机制
DOI：
10.1016/j.snb.2014.08.017
复制
发表时间：
2014-12-01
影响因子：
8.4
通讯作者：
Liu, Chung-Chiun
中科院分区：
文献类型：
--
作者：
Bai, Shouli;Chen, Chao;Liu, Chung-Chiun
在不使用任何表面活性剂和模板剂的情况下，采用低温水热法成功合成了宽度为200-800 nm、长度为几微米的纯的和Cd掺杂的正交晶系三氧化钼（α-MoO 3）纳米带。采用XRD和FESEM对产物的晶体结构和形貌进行了表征。传感测量表明，合成的样品不仅表现出高响应H2S，但也小的交叉敏感到其他还原性气体。室温PL、拉曼和XPS测试结果证实了Cd掺杂样品中本征缺陷的变化是其传感性能增强的原因。利用L-H非均相反应机理对传感器在不同气体浓度下的瞬态响应进行了测量和建模。根据光致发光谱和X射线光电子能谱的特点，详细分析了掺镉量为5wt%的样品气敏增强的原因和机理。(C)2014爱思唯尔有限公司版权所有。
Pure and Cd-doped orthorhombic molybdenum trioxide (alpha-MoO3) nanobelts with width of 200-800 nm and length of several micrometers have been successfully synthesized by a facile and low temperature (120 degrees C) hydrothermal method without any surfactant or template. The crystal structure and morphology of the products were characterized by XRD and FESEM. The sensing measurements reveal that the synthesized samples not only exhibit high response to H2S but also small cross-sensing to other reducing gases. The change of intrinsic defects in Cd-doped sample is responsible for the enhancement of the sensing properties, which has been confirmed by the room temperature PL, Raman and XPS. The response transients of the sensors under different gas concentrations were measured and modeled using L-H heterogeneous reaction mechanism. Origin and mechanism of the enhanced gas sensing for 5 wt% Cd-doped sample were analyzed in detail according to the characteristic of PL and XPS. (C) 2014 Elsevier B.V. All rights reserved.