Shape-controlled multi-dimensional In2O3/Mn2O3 p-n heterojunction for triethylamine detection

• Published in: Journal of alloys and compounds Vol. 960; p. 170527
• Main Authors: Wu, Ran, Liu, Tao, Chen, Xingtai, Yin, Xi-Tao
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.10.2023
• Subjects: Gas sensor; Heterojunction; Mn2O3 nanorod; Multi-dimensional; Triethylamine; Mn2O3 nanorod; Multi-dimensional; Gas sensor; Triethylamine; Heterojunction
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.170527

Due to the excellent properties, multi-dimensional p-n heterojunction materials are widely used in the field of gas sensing. In this work, In2O3-modified Mn2O3 nanorod was prepared by a hydrothermal method. The composites had excellent detection performance for triethylamine (TEA). The composites had rich 0D-1D multi-dimensional nanostructures. The sensing properties of composites with different In/Mn ratios were investigated by adjusting the proportion of Mn. The test results showed composite material had high response, excellent selectivity, ultra-high resistance stability and repeatability during repeated testing. High specific surface area, abundant active sites by the formation of multi-dimensional heterojunction, and Mn3+/Mn4+ fast redox cycling of compound material made the excellent sensing performance. This work provided a reference for designing multi-dimensional heterostructures and high performance gas sensors. •In2O3/Mn2O3 materials were synthesized by a two-step hydrothermal method for the first time.•Highest sensitive and selective detection of triethylamine at 180 ℃ among the previous composite materials (p-n junction).•One-dimensional nanorod structure with high specific surface area.•The gas sensing performance was enhanced by constructing heterojunctions and fast redox reactions of Mn3+/Mn4+.