【摘要】 为了解决纯SnO₂基气体传感器对乙炔（C₂H₂）工作温度高的难题，采用水热法对原位生长的SnO₂纳米墙进行不同摩尔比的金属铬（Cr）元素掺杂，研究了Cr掺杂对SnO₂纳米墙的形貌结构与气敏性能的影响。研究结果表明：当掺杂摩尔分数x（Cr）=3%时，制备的SnO₂纳米墙垂直于衬底方向定向生长，纳米片相互交联形成了三维立体多孔网络结构，为气体的吸附提供了活性位点和传输通道；与纯SnO₂纳米墙相比，掺杂摩尔分数x（Cr）=3%制备的SnO₂基气体传感器在检测质量分数w为2×10^-4的C₂H₂时，最佳工作温度由175℃降至125℃,响应值高达8.1,检测极限低至1×10^-6,响应和恢复时间分别为165 s和80 s。结论可为研究低工作温度的C₂H₂传感器的制备及应用提供参考。更多还原

【Abstract】 The study aims to reduce the high working temperature of pure SnO₂-based acetylene（C₂H₂） gas sensor.SnO₂ nanowall grown in-situ was doped with chromium（Cr） at different molar ratios by the hydrothermal method, and the effect of Cr doping on the morphology, microstructure and gas sensing performance of SnO₂ nanowall was investigated.The results show that when the molar fraction x（Cr）=3%,the doped SnO₂ nanowalls grow perpendicular to the substrate, and the nanosheets are crosslinked to form a three-dimensional porous network structure, which provides the active sites and transport channels for gas adsorption.Compared with pure SnO₂ nanowalls, the optimal operating temperature of the SnO₂ nanowalls gas sensors whose molar fraction x（Cr）=3% is decreased from 175 ℃ to 125 ℃,the response value is up to 8.1,the detection limit is as low as 1×10^-6,and the response and recovery times are 165 s and 80 s, respectively.This study will pave a way for the study of the preparation and application of C₂H₂ sensors which work at low temperature.更多还原