UV-enhanced CO sensing using Ga 2O3-based nanorod arrays at elevated temperature

Lin, Hui-Jan; Gao, Haiyong; Gao, Pu-Xian

doi:10.1063/1.4974213

Title: UV-enhanced CO sensing using Ga ₂O₃-based nanorod arrays at elevated temperature

Journal Article · Mon Jan 23 00:00:00 EST 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4974213· OSTI ID:1430257

Lin, Hui-Jan ^[1]; Gao, Haiyong ^[1]; Gao, Pu-Xian ^[1]

Univ. of Connecticut, Storrs, CT (United States). Dept. of Materials Science and Engineering. Inst. of Materials Science

Monitoring and control of gaseous combustion process are critically important in advanced energy systems such as power plants, gas turbines, and automotive engines. However, very limited gas sensing solutions are available in the market for such application due to the inherent high temperature of combustion gaseous atmosphere. In this study, we fabricated and demonstrated high-performance metal oxide based nanorod array sensors assisted with ultra-violet (UV) illumination for in situ and real-time high-temperature gas detection. Without UV-illumination, it was found surface decoration of either 5 nm LSFO or 1 nm Pt nanoparticles can enhance the sensitivity over CO at 500 °C by an order of magnitude. Under the 254 nm UV illumination, CO gas-sensing performance of Ga₂O₃-based nanorod array sensors was further enhanced with the sensitivity boosted by 125 %, and the response time reduced by 30 % for La_0.8Sr_0.2FeO₃(LSFO)-decorated sample. The UV-enhanced detecting of CO might be due to the increased population of photo-induced electron-hole pairs. While for LSFO-decorated nanorod array sensor under UV illumination, the enhancement is through a combination of sensitizing effect and photocurrent effect.

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Research Organization:: Univ. of Connecticut, Storrs, CT (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: EE0006854; FE0000870; FE0011577

OSTI ID:: 1430257

Alternate ID(s):: OSTI ID: 1361742

Journal Information:: Applied Physics Letters, Vol. 110, Issue 4; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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MOF-derived synthesis of mesoporous In/Ga oxides and their ultra-sensitive ethanol-sensing properties Cui, Y. F.; Jiang, W.; Liang, S. Journal of Materials Chemistry A, Vol. 6, Issue 30 https://doi.org/10.1039/c8ta00269j	journal	January 2018
Gas transport regulation in a MO/MOF interface for enhanced selective gas detection Yao, Ming-Shui; Cao, Lin-An; Tang, Yong-Xiang Journal of Materials Chemistry A, Vol. 7, Issue 31 https://doi.org/10.1039/c9ta05226g	journal	January 2019
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