Issue 7, 2020

An α-Fe2O3/NiO p–n hierarchical heterojunction for the sensitive detection of triethylamine

Abstract

A novel p–n heterojunction of an α-Fe2O3/NiO composite was prepared by precipitation and hydrothermal methods. The structure, morphology and composition of the composite were characterized by numerous spectroscopic methods and its gas sensing properties for triethylamine (TEA) were also tested. The results showed that the composite (Fe/Ni = 4 : 1 atomic ratio) exhibited a fast response approximately 4 times that of α-Fe2O3 with excellent selectivity, stability and linear response in the range from 5 to 25 ppm TEA at 140 °C, which was due to the large specific surface area of the hierarchical structure and the formation of p–n heterojunctions at the interface of both the metal oxides. Therefore, the composite synthesized in this study is a promising sensing material for the detection of TEA and the work provides a new route to rationally design sensor structures for realizing the synergetic functions of metal oxide semiconductor interfaces.

Graphical abstract: An α-Fe2O3/NiO p–n hierarchical heterojunction for the sensitive detection of triethylamine

Article information

Article type
Research Article
Submitted
28 Nov 2019
Accepted
01 Feb 2020
First published
05 Feb 2020

Inorg. Chem. Front., 2020,7, 1532-1539

An α-Fe2O3/NiO p–n hierarchical heterojunction for the sensitive detection of triethylamine

S. Bai, J. Han, N. Han, K. Zhang, J. Sun, L. Sun, R. Luo, D. Li and A. Chen, Inorg. Chem. Front., 2020, 7, 1532 DOI: 10.1039/C9QI01548E

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