• 文献标题:   Graphene-Modified ZnO Nanostructures for Low-Temperature NO2 Sensing
  • 文献类型:   Article
  • 作  者:   QU GP, FAN GJ, ZHOU MY, RONG XR, LI T, ZHANG R, SUN J, CHEN DL
  • 作者关键词:  
  • 出版物名称:   ACS OMEGA
  • ISSN:   2470-1343
  • 通讯作者地址:   Zhengzhou Univ
  • 被引频次:   9
  • DOI:   10.1021/acsomega.8b03624
  • 出版年:   2019

▎ 摘  要

This paper develops a novel ultrasonic spray-assisted solvothermal (USS) method to synthesize wrapped ZnO/reduced graphene oxide (rGO) nanocomposites with a Schottky junction for gas-sensing applications. The as-obtained ZnO/rGO-x samples with different graphene oxide (GO) contents (x = 0-1.5 wt %) are characterized by various techniques, and their gas-sensing properties for NO2 and other VOC gases are also evaluated. The results show that the USS-derived ZnO/rGO samples exhibit high NO2-sensing property at low operating temperatures (e.g., 70-130 degrees C) because of their high specific surface area and porous structures when compared with the ZnO/rGO sample obtained by the traditional precipitation method. The content of rGO shows an obvious effect on their NO2-sensing properties, and the ZnO/rGO-0.5 sample has a high response of 62 operating at 130 degrees C, three times that of pure ZnO. The detection limit of the ZnO/rGO-0.5 sensor to NO2 is as low as 10 ppb under the present test condition. In addition, the ZnO/rGO-0.5 sensor shows a highly selective response to NO2 gas when compared with organic vapors and other inflammable or toxic gases. The theoretical and experimental analyses indicate that the enhancement in NO2-sensing performance of the ZnO/rGO sensor is attributed to the formation of wrapped ZnO/rGO Schottky junctions.