Nanosheet-assembled In2O3 for sensitive and selective ozone detection at low temperature

To monitor ozone (O-3) concentration in the environment, it is urgent to develop highly sensitive O-3 gas sensors with low limit of detection (LOD) and relatively low working temperature. Herein, a series of na-nosheet-assembled In2O3 with different chemisorbed oxygen components were prepared successfully. The hierarchical In2O3 sensing materials possessed the loose and porous structure. The O-3 sensing results in-dicated that the adjustment on the amount of chemisorbed oxygen finely enhanced the response of the sensor. As an efficient O-3 detector, the sensor exhibited an outstanding response of 16.7 to low con-centration of O-3 (100 ppb). And the LOD was measured as low as 30 ppb at a relatively low operating temperature (80 degrees C). In addition, it is observed that the O-3 sensing behaviors were interfered by oxygen (O-2) at the background. The response of the sensor was lower at the background of pure O-2 than that at the background of air. Competitive adsorption between O-3 and O-2 molecules might exist and was investigated. Taken together, this work expands a new perspective to design highly superior O-3 gas sensors. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A series of nanosheet-assembled In2O3 materials with different chemisorbed oxygen components were successfully prepared, showing enhanced response by adjusting the amount of chemisorbed oxygen. As an efficient O-3 detector, the sensor exhibited outstanding response to low concentrations of O-3 and a low LOD at a relatively low operating temperature. The O-3 sensing behaviors were interfered by background oxygen, suggesting competitive adsorption between O-3 and O-2 molecules.