Issue 17, 2023

High-performance UV-activated room temperature NO2 sensors based on TiO2/In2O3 composite

Abstract

Porous TiO2 nanoparticle (NPs)-embedded In2O3 nanofibers (NFs) were synthesized using electrospinning for fabricating room temperature (RT) nitrogen dioxide (NO2) gas sensors. The diameter of the porous polycrystalline TiO2/In2O3 nanofibers was 60 nm and they were composed of sub-grains of average size 10–15 nm. Compared to pure In2O3 nanofibers, the TiO2/In2O3 nanofibers exhibited higher response, shorter response and recovery times, better reproducibility, and improved selectivity to NO2. The response of the TiO2/In2O3 composite to 5 ppm NO2 at RT under ultraviolet (UV) irradiation was 49.29, which was 8.96 times higher than that of pure In2O3. Even for a high relative humidity (RH) of 80%, the response of the TiO2/In2O3 composite to 5 ppm NO2 was approximately 41.25. The enhanced NO2 sensing performance of the composite can be ascribed to the formation of the TiO2/In2O3 n–n heterojunction, porous structure of the nanofibers, enhanced light absorption, and large number of O vacancies.

Graphical abstract: High-performance UV-activated room temperature NO2 sensors based on TiO2/In2O3 composite

Supplementary files

Article information

Article type
Paper
Submitted
02 янв 2023
Accepted
07 мар 2023
First published
29 мар 2023

CrystEngComm, 2023,25, 2546-2556

High-performance UV-activated room temperature NO2 sensors based on TiO2/In2O3 composite

Z. Cai, J. Park, D. Jun and S. Park, CrystEngComm, 2023, 25, 2546 DOI: 10.1039/D3CE00004D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements