基于取向生长NiO纳米片的室温响应ppb级NO_(2)气体传感器

Room temperature NO_(2) gas sensor with ppb detecting limit based on oriented NiO nanosheets

二氧化氮(NO_(2))作为最主要的大气污染物,对水体、土壤、大气以及人体健康有严重危害,研发室温工作、低浓度探测、高响应、便携式的气体传感器是NO_(2)传感器的迫切需求。本文用水热法在石英玻璃衬底上生长(111)取向生长的NiO纳米片薄膜,通过对水热反应前驱体中六水氯化镍(NiCl_(2)·6H_(2)O)浓度的调控实现对NiO纳米片取向性、致密度和薄膜厚度的调节。基于该薄膜的NO_(2)传感器可在室温工作,对10 ppb NO_(2)的响应达到19%,且对低浓度NO_(2)有良好的选择性。

Nitrogen dioxide(NO_(2)),as one of the most concerned air pollutants,has caused serious effects on water,soil,atmosphere and human health.It is urgent to develop a portable NO_(2)gas sensor that can detect low concentration of NO_(2)with high response at room temperature.In this work,(111)oriented NiO nanosheets were fabricated on quartz substrate by hydrothermal method.The orientation,density,thickness of the NiO thin film were adjusted by changing the concentration of the NiCl_(2)·6H_(2)O precursor in the hydrothermal reaction.NO_(2)gas sensor based on the(111)oriented NiO thin film could work at room temperature,and it can detect 10 ppb NO_(2)with a response of 19%.It also has good selectivity toward NO_(2).