CuO纳米片的合成及其对甲硫醇气敏性能研究

Synthesis of CuO Nanosheets and Their Gas Sensing Performances for Methanethiol

针对目前甲硫醇气体检测手段相对复杂、耗时且成本较高的现状,本文发展半导体气体传感方法对其进行检测,通过将水热法与后续热处理相结合,制备出CuO纳米片材料,并利用XRD、TEM、SEM、HRTEM对材料的结构和微观形貌进行表征。所制备的CuO纳米片作为敏感材料在139℃下对甲硫醇表现出优异的敏感特性,检测下限可达到12ppb,响应和恢复时间分别为10.4s和64.8s,同时具有优异的可重复性。该优异传感性能可能归因于CuO纳米片表面吸附的氧物种与甲硫醇之间发生的氧化还原反应,其导致CuO表面的空穴积累层变化,进而电阻发生改变。该项研究将为甲硫醇气体的检测提供一种新思路。

In view of the current situation that the methionine gas detection method is relatively complex,time-consuming and high cost,the semiconductor gas sensor is used to detect it.By combining hydrothermal method with subsequent heat treatment,CuO nanosheet materials were prepared and characterized by XRD,TEM,SEM and HRTEM.In addition,such CuO nanosheets show excellent sensing performances to methanethiol with a detection limit can reach 12 ppb at 139 ℃.The response time and recovery time are 10.4 s and 64.8 s,respectively,and it has excellent repeatability toward methanethiol.Moreover,the excellent sensing performances may be attributed to the redox reaction between the oxygen species adsorbed on the surface of CuO nanosheet and methanethiol,which results in the change of hole accumulation layer on the surface of CuO and the change of its resistance.This study will provide a new way for the detection of methanethiol gas.