NO2 detection and redox capacitance reaction of Ag doped SnO2/rGO aerogel at room temperature

A new material of Ag-SnO2/rGO aerogel is fabricated by the sol-gel method and freeze-drying technique. The SnO2 particles are tightly arranged on the rGO sheets to form a p-n heterojunction, and the rGO aerogel possesses abundant pore structures for effective adsorption. Besides, the Ag particles are dispersed on the surface as a catalyst to improve the internal electron mobility, further promoting the gas-sensing performance. To be noted, the Ag-SnO2/rGO aerogel can exhibit a response of 2.13 towards 50 ppm NO2 at RT instead of heating conditions, and shows a cyclic capacitance property of redox. Moreover, the non-linear growth between gas concentration and response is observed, which proves the chemical adsorption that results in the high selectivity. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The new material of Ag-SnO2/rGO aerogel is prepared using the sol-gel method and freeze-drying technique, exhibiting excellent redox performance and high selectivity.