Fabrication of TeNT/TeO2 heterojunction based sensor for ultrasensitive detection of NO2

IF 12.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Hazardous Materials Pub Date : 2025-01-15 DOI:10.1016/j.jhazmat.2025.137229

Shupeng Sun, Xinlei Li, Yanhui Sun, Nan Wang, Baoyu Huang, Xiaogan Li

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Abstract

Tellurium nanotubes (TeNT) heterojunction with Tellurium oxide (TeO₂) were prepared by in situ oxidation at elevated temperatures in air. The chemiresistive type NO₂ sensor was then fabricated by depositing the synthesized TeNT/TeO₂ on the integrated gold electrodes. The response of the TeNT/TeO₂ based sensor to 600 ppb NO₂ was 38.8%, which was about 3.2 times higher than that of the single-phase TeNT based sensor (12.1%). The response and recovery time are 39 s and 49 s, respectively, which are substantially reduced compared to those of the pristine TeNT based sensor (133 s and 336 s) and the results reported in literature. The sensor also exhibits good stability with a response deviation of less than 2% for 45 days and a good resistance to environmental disturbances. The improved sensor performance can be attributed to the heterojunction formed between TeNT and TeO₂. Density Functional Theory (DFT) calculations show that the formed TeNT/TeO₂ heterojunction enhances the adsorption energy (-0.671 eV) and charge transfer (0.49 |e|) between NO₂ and the TeNT/TeO₂.

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来源期刊

Journal of Hazardous Materials 工程技术-工程：环境

CiteScore

25.40

自引率

5.90%

发文量

3059

审稿时长

58 days

期刊介绍： The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.