TY - JOUR
T1 - CuO/M(OH)₂ (M = Mg, Ca) heterostructures with in-situ oxygen vacancies enable room-temperature ultrahigh triethylamine sensing
AU - Li, Ruixiang
AU - Chen, Shu
AU - Wang, Beibei
AU - Wang, Xiaodan
AU - Hu, Xinyu
AU - Albiol, Sonia Estrade
AU - Gallego, Cristian Fabrega
AU - Shen, Hao
AU - Luo, Chunhua
AU - Peng, Hui
AU - Lin, Hechun
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2025/10/1
Y1 - 2025/10/1
N2 - Room-temperature gas sensors are crucial for detecting toxic gases and volatile organic compounds (VOCs). Conventional metal oxide semiconductor (MOS)-based sensors, however, often require high-temperature operation and suffer from low sensitivity. Here, we present a one-step mini-mechanochemical synthesis of CuO/M(OH)2 (M = Mg, Ca) heterostructures that exhibit exceptional room-temperature sensing performance towards triethylamine (Et3N). Our results reveal a tenfold enhancement in the sensor response to Et3N compared to pristine CuO. This remarkable improvement is attributed to the in-situ formation of oxygen vacancies in CuO induced by the incorporation of M(OH)2, as evidenced by X-ray photoelectron spectroscopy (XPS), positron annihilation spectroscopy (PAS), and electron paramagnetic resonance (EPR). Notably, CuO/Mg(OH)2 demonstrates superior long-term stability, while CuO/Ca(OH)2 suffers from performance decay due to environmental carbonation. Furthermore, we developed a portable Et₃N analysis device based on the CuO/Mg(OH)2 sensor, which enables real-time monitoring with Wi-Fi capability and achieves an accuracy within 6 % error across a 1 to 100 ppm detection range. This study not only provides a cost-effective and scalable fabrication method for CuO-based gas sensors but also highlights the potential of CuO/M(OH)₂ in practical applications for environmental monitoring and food safety assessment.
AB - Room-temperature gas sensors are crucial for detecting toxic gases and volatile organic compounds (VOCs). Conventional metal oxide semiconductor (MOS)-based sensors, however, often require high-temperature operation and suffer from low sensitivity. Here, we present a one-step mini-mechanochemical synthesis of CuO/M(OH)2 (M = Mg, Ca) heterostructures that exhibit exceptional room-temperature sensing performance towards triethylamine (Et3N). Our results reveal a tenfold enhancement in the sensor response to Et3N compared to pristine CuO. This remarkable improvement is attributed to the in-situ formation of oxygen vacancies in CuO induced by the incorporation of M(OH)2, as evidenced by X-ray photoelectron spectroscopy (XPS), positron annihilation spectroscopy (PAS), and electron paramagnetic resonance (EPR). Notably, CuO/Mg(OH)2 demonstrates superior long-term stability, while CuO/Ca(OH)2 suffers from performance decay due to environmental carbonation. Furthermore, we developed a portable Et₃N analysis device based on the CuO/Mg(OH)2 sensor, which enables real-time monitoring with Wi-Fi capability and achieves an accuracy within 6 % error across a 1 to 100 ppm detection range. This study not only provides a cost-effective and scalable fabrication method for CuO-based gas sensors but also highlights the potential of CuO/M(OH)₂ in practical applications for environmental monitoring and food safety assessment.
KW - CuO/M(OH) (M = Mg, Ca)
KW - Enhanced sensing mechanism
KW - In-situ formation of oxygen vacancies
KW - Practical applications
KW - Room-temperature gas sensors
UR - https://www.scopus.com/pages/publications/105013393827
U2 - 10.1016/j.cej.2025.167104
DO - 10.1016/j.cej.2025.167104
M3 - 文章
AN - SCOPUS:105013393827
SN - 1385-8947
VL - 521
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 167104
ER -