Synergistic Effect of Electron Scattering and Space Charge Transfer Enabled Unprecedented Room Temperature NO2 Sensing Response of SnO2

Small - Tập 19 Số 48 - 2023
Yajie Zhang1, Yadong Jiang1, Zhen Yuan1, Bohao Liu1, Qiuni Zhao1, Qi Huang1, Ziteng Li2, Wen Zeng2, Zaihua Duan1, Huiling Tai1
1State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054 P. R. China
2College of Materials Science and Engineering, Chongqing University, Chongqing, 400030, P. R. China

Tóm tắt

Abstract

Metal oxide gas sensors have long faced the challenge of low response and poor selectivity, especially at room temperature (RT). Herein, a synergistic effect of electron scattering and space charge transfer is proposed to comprehensively improve gas sensing performance of n‐type metal oxides toward oxidizing NO2 (electron acceptor) at RT. To this end, the porous SnO2 nanoparticles (NPs) assembled from grains of about 4 nm with rich oxygen vacancies are developed through an acetylacetone‐assisted solvent evaporation approach combined with precise N2 and air calcinations. The results show that the as‐fabricated porous SnO2 NPs sensor exhibits an unprecedented NO2‐sensing performance, including outstanding response (Rg/Ra = 772.33 @ 5 ppm), fast recovery (<2 s), an extremely low detection limit (10 ppb), and exceptional selectivity (response ratio >30) at RT. Theoretical calculation and experimental tests confirm that the excellent NO2 sensing performance is mainly attributed to the unique synergistic effect of electron scattering and space charge transfer. This work proposes a useful strategy for developing high‐performance RT NO2 sensors using metal oxides, and provides an in‐depth understanding for the basic characteristics of the synergistic effect on gas sensing, paving the way for efficient and low power consumption gas detection at RT.

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Small

Tập 19 Số 48

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