High sensitive room temperature NO2 gas sensor based on the avalanche breakdown induced by Schottky junction in TiO2-Sn3O4 nanoheterojunctions

Chen, Duo ¹Yu, Wencheng ¹Wei, Lin ²Ni, Jiasheng ¹Li, Hui ¹Chen, Yanxue ²Tian, Yufeng ²Yan, Shishen ²Mei, Liangmo ²Jiao, Jun³

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作者信息

1. Qilu Univ Technol
2. Shandong Univ
3. Portland State Univ
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Abstract

A novel sensor based on Schottky junction inducing avalanche breakdown effect in TiO2-Sn3O4 nanoheterojunctions is assembled. High sensitivity for NO2 gas sensing is demonstrated at room temperature. TiO2- Sn3O4 nanocompositewas synthesized as the gas sensing layer and Schottky contact was formed by Au electrodes. The Schottky contact functions as a "gate " which can trigger the avalanche breakdown effect in the TiO2- Sn3O4 heterojunctions. By tuning the Schottky barrier height through the responsive variation of the surface chemisorbed gas and the bias on the device, NO2 at a concentration from 5 to 50 ppm can be detected with an average response time of 8 s at room temperature. This nanostructured device is a promising candidate for application in high-sensitivity and high-speed NO2 gas sensor. The methodology and working principle illustrated in this paper present a new sensing mechanism that can be readily and extensively applied to other gas sensing systems. (C)& nbsp;2022 Published by Elsevier B.V.

Key words

TiO2-Sn3O4 nanostructure/Schottky contact/Avalanche breakdown/NO2 sensor/NANOBELT HETEROSTRUCTURES/PHOTODETECTOR/FOAM/SNO2

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出版年

2022

Journal of Alloys and Compounds

EISCI

ISSN：0925-8388

被引量12

参考文献量35

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