Highly sensitive and stable room-temperature gas sensors based on the photochemically activated p-type CuAlO2 thin films
Journal
Materials Chemistry and Physics
Journal Volume
309
Date Issued
2023-11-01
Author(s)
Lin, Yan Fong
Dong, Bo Chang
Liao, Su Yu
Chen, Bo Rui
Lin, Li Zhen
Chang, Yung Yi
Wu, Min Hsin
Su, Po Yu
Chen, Bo Cheng
Huang, Chun Ying
Abstract
Activating metal oxide-based gas sensors using UV-LED is a promising approach to operating them at low temperatures. This method preserves the film characteristics, thereby ensuring the stability of the devices. In this report, we present a remarkably sensitive and stable gas sensor based on solution-processed p-type copper aluminum oxide (CuAlO2), which can sense O3 gas at room temperature. Moreover, the sensitivity is further improved through exposure to ultraviolet (UV) radiation. The optimal gas response of 12.32 can be achieved under UV illumination of 20 mW/cm2 at room temperature. More importantly, the CuAlO2 sensor exhibits outstanding stability, with a deterioration of only ∼10% over a period of 3 months. These findings suggest that CuAlO2 is a promising material for gas sensing at room temperature.
Subjects
CuAlO 2 | Gas sensors | Photochemical activation | Sol-gel coating
SDGs
Type
journal article