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Abstract
Listeria monocytogenes (L. monocytogenes) has been recognized as one of the extremely hazardous and potentially life-threatening food-borne pathogens, its real-time monitoring is of great importance to human health. Herein, a simple and effective method based on platinum sensitized tin dioxide semiconductor gas sensors has been proposed for selective and rapid detection of L. monocytogenes. Pt doped SnO2 nanospheres with particular mesoporous hollow structure have been synthesized successfully through a robust and template-free approach and used for the detection of 3-hydroxy-2-butanone biomarker of L. monocytogenes. The steady crystal structure, unique micromorphology, good monodispersit, and large specific surface area of the obtained materials have been confirmed by X-ray diffraction (XRD), Raman spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), Brunauer-Emmett-Teller (BET), and Photoluminescence spectra (PL). Pt doped SnO2 mesoporous hollow nanosphere sensors reach the maximum response of 3-hydroxy-2-butanone at 250°C. Remarkably, sensors based on SnO2 mesoporous hollow nanospheres with 0.16 wt% Pt dopant exhibit excellent sensitivity (Rair/Rgas = 48.69) and short response/recovery time (11/20 s, respectively) to 10 ppm 3-hydroxy-2-butanone at the optimum working temperature. Moreover, 0.16 wt% Pt doped SnO2 gas sensors also present particularly low limit of detection (LOD = 0.5 ppm), superb long-term stability and prominent selectivity to 3-hydroxy-2-butanone. Such a gas sensor with high sensing performance foresees its tremendous application prospects for accurate and efficient detection of foodborne pathogens for the food security and public health.
Highlights
Bacterial foodborne pathogens are widely spread and cause millions of cases of human illness every year around the world (Carlson et al, 2018)
We present a low-cost and easy-to-use Pt doped SnO2 mesoporous hollow nanospheres based gas sensor for selective and rapid determination of 3-hydroxy2-butanone biomarker
The 0.16 wt% Pt doped SnO2 mesoporous hollow nanospheres sensor display the highest sensitivity, reaching 48.69 (Rair/Rgas) toward 10 ppm 3-hydroxy-2-butanone at 250◦C, while that of gas sensor assembled with pure SnO2 hollow nanospheres is only about 14.37 (Rair/Rgas)
Summary
Bacterial foodborne pathogens are widely spread and cause millions of cases of human illness every year around the world (Carlson et al, 2018). The 0.16 wt% Pt doped SnO2 mesoporous hollow nanospheres sensor display the highest sensitivity, reaching 48.69 (Rair/Rgas) toward 10 ppm 3-hydroxy-2-butanone at 250◦C, while that of gas sensor assembled with pure SnO2 hollow nanospheres is only about 14.37 (Rair/Rgas) This kind of gas sensor based on 0.16 wt% Pt sensitized metal oxide semiconductor presents fast response/recovery time (11/20 s, respectively), low limit of detection (LOD = 0.5 ppm), excellent selectivity and long-term stability, showing greater advantages for rapid and ultrasensitive detection of L. monocytogenes in food, environment, clinical, and communal samples
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