Journal
NANOSCALE
Volume 14, Issue 2, Pages 482-491Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nr06729j
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Funding
- National Natural Science Foundation of China [52072184]
- Fundamental Research Funds for the Central Universities, Nankai University [63201179]
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This study introduces a newly emerged strategy for indirect monitoring of Listeria monocytogenes (LM) using a gas sensor that can detect the bacterial metabolite 3-hydroxy-2-butanone (3H-2B). The developed highly selective and sensitive 3H-2B sensors, composed of zinc oxide nanorods decorated with cobaltosic oxide nanoparticles (ZnO NRs/Co3O4 NPs), exhibit ultrahigh sensitivity and excellent stability, enabling detection as low as 10 ppb 3H-2B. The outstanding sensing performance is attributed to the modulated electron depletion layer and abundant gas diffusion pathways, showing potential for real-time detection of 3H-2B biomarker.
Indirect monitoring of Listeria monocytogenes (LM) via a gas sensor that can detect the bacterial metabolite 3-hydroxy-2-butanone (3H-2B) is a newly emerged strategy. However, such sensors are required simultaneously endow with outstanding selectivity, high sensitivity, and ppb-level detection limit, which remains technologically challenging. Herein, we have developed highly selective and sensitive 3H-2B sensors that consist of zinc oxide nanorods decorated with cobaltosic oxide nanoparticles (ZnO NRs/Co3O4 NPs), which have been synthesized by combined optimized hydrothermal and annealing process. Specifically, the ZnO NRs/Co3O4 NPs exhibit ultrahigh sensitivity to 5 ppm 3H-2B (R-a/R-g = 550 at 260 degrees C). The sensor prototypes enable detection as low as 10 ppb 3H-2B, show excellent long-term stability, and present remarkable selectivity through interfering selectivity survey and principal component analysis (PCA). Such outstanding sensing performance is attributed to the modulated electron depletion layer by n-p heterojunctions and abundant gas diffusion pathways via the radial architecture, which was verified via electrochemical impedance spectroscopy test, Mott-Schottky measurement, and ultraviolet-visible absorption analysis. Our highly selective and sensitive ZnO NRs/Co3O4 NPs have the potential in the real-time detection of 3H-2B biomarker.
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