A Single Response to Reducing Gases by Nio-Tio2 Heterojunction Nanocrystals

27 Pages Posted: 2 May 2023

See all articles by Shuai Nie

Shuai Nie

University of Science and Technology Liaoning - School of Materials and Metallurgy

Lin Tao

University of Science and Technology Liaoning

Jing Li

University of Science and Technology Liaoning

Wensen Wang

University of Montpellier

Preeyaporn Poldorn

Chulalongkorn University

Yunxia He

University of Science and Technology Liaoning

Xi-Tao Yin

Ludong University

Mingjie Wu

McGill University

Abstract

Utilizing p-n composite material to fabricate metal-oxide semiconductors (MOSs) gas sensors is a promising strategy to achieve ultrahigh selectivity detection of reducing gases, such as H2 and CO. This work utilized a facile doping method to synthesize p-NiO/n-xTiO2 nanoparticles with p-n heterojunction. The p-NiO/n-1.0TiO2 nanoparticles annealed at 550°C exhibited ultrahigh selectivity with an n-type gas-sensitive response to H2 at 300°C, eliminating the cross-sensitivity phenomenon. In addition, the gas selectivity to H2 and CO highly depended on the Ni:Ti molar ratios and operating temperature. The study of the H2 and CO adsorption behavior on the NiO-TiO2 revealed that H2 is more easily adsorbed on the NiO-TiO2 heterojunction surface than CO. The introduction of H2 caused electron transfer between the gas molecule and the surface atoms of the heterojunction, while the electronic structure of the system remained unchanged after CO adsorption. This study provides an effective method to improve the selectivity of MOS-based gas sensors.

Keywords: p-n heterojunction, NiO-TiO2 gas sensors, ultrahigh selectivity, reducing gases, first-principle calculations

Suggested Citation

Nie, Shuai and Tao, Lin and Li, Jing and Wang, Wensen and Poldorn, Preeyaporn and He, Yunxia and Yin, Xi-Tao and Wu, Mingjie, A Single Response to Reducing Gases by Nio-Tio2 Heterojunction Nanocrystals. Available at SSRN: https://ssrn.com/abstract=4436126 or http://dx.doi.org/10.2139/ssrn.4436126

Shuai Nie

University of Science and Technology Liaoning - School of Materials and Metallurgy ( email )

Anshan, Liaoning 114051
China

Lin Tao

University of Science and Technology Liaoning ( email )

Anshan, 114051
China

Jing Li

University of Science and Technology Liaoning ( email )

Anshan, 114051
China

Wensen Wang

University of Montpellier ( email )

163 rue Auguste Broussonnet
France

Preeyaporn Poldorn

Chulalongkorn University ( email )

Bangkok
Bangkok 10330
Thailand

Yunxia He

University of Science and Technology Liaoning ( email )

Anshan, 114051
China

Xi-Tao Yin

Ludong University ( email )

186 Hongqi W Rd
Zhifu
Yantai
China

Mingjie Wu (Contact Author)

McGill University ( email )

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