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Hollow Sn-doped ZnO nanotubes for synergistically enhanced sensing performance toward 3-hydroxy-2-butanone with
Xiao-Xue Lian1, Jing-Wen Liu1, Yan Li1
1College of Science, Civil Aviation University of China, Tianjin, 300300, PR China.
Abstract:
Targeted detection of the 3-hydroxy-2-butanone (3H-2B) biomarker represents a feasible and reliable strategy for monitoring Listeria monocytogenes, a highly virulent foodborne pathogen that poses severe threats to public health and food safety. The significance of this study lies in addressing the urgent demand for rapid, sensitive, and on-site detection of Listeria monocytogenes, as traditional detection methods are often time-consuming, labor-intensive, and unsuitable for field applications. Herein, we successfully prepared Sn-doped ZnO hollow nanotubes via an electrospinning process, and further designed a multi-parameter intelligent sensing system based on this material for portable 3H-2B detection. A key improvement of our work is the synergistic integration of Sn doping and morphological engineering, which dramatically enhances gas-sensing performance: Sn doping introduces a high density of oxygen vacancies and free charge carriers, while the tailored hollow nanotube configuration maximizes the accessibility of active sites and facilitates rapid gas diffusion across the sensing interface. The optimized 3% Sn-doped ZnO sensor exhibits excellent 3H-2B sensing performance, with an optimal response of 155.1 to 100 ppm 3H-2B at 200 °C, a rapid response time of 1 s, and a low detection limit of 100 ppb, significantly outperforming undoped ZnO and other Sn-doped counterparts. This sensing system shows promising application prospects in food safety supervision, catering industry, and food processing workshops, enabling rapid on-site monitoring of Listeria monocytogenes contamination. This study not only establishes Sn-doped ZnO hollow nanotubes as a superior sensing platform for 3H-2B but also opens a new avenue for the rapid, sensitive detection of foodborne pathogens, providing technical support for food safety guarantee.
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