期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 271, 期 -, 页码 311-320出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.05.089
关键词
Poly-dopamine; Hollow mesoporous silica spheres; Quartz crystal microbalance; Formaldehyde detection
资金
- National Natural Science Foundation of China [31501555, 81772007, 21734003, 31701678]
- Science and Technology Commission of Shanghai Municipality [17JC1400200, 16391903900]
- China's 1000 Young Talents Program
- Education Commission of Shanghai Municipality (Young Eastern Professorship Award)
In this study, poly-dopamine functionalized hollow mesoporous silica spheres (PDA/HMSSs) are prepared and exploited as a sensing material for formaldehyde detection in food. The materials were characterized by small-angle X-ray diffraction, scanning electron microscope, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectrometry, and nitrogen adsorption-desorption. The results show that PDA was successfully modified onto the surface of HMSSs. The PDA/HMSSs-based quartz crystal microbalance (QCM) sensors exhibited a low detection limit of 100 ppb, a remarkably rapid response (< 5 s), a short recovery (< 3 s), as well as excellent sensitivity due to available hollow space and accessibly radial channels. Based on enthalpy change (Delta H degrees= 51.97 KJ/mol) and the formation of CN bonds, studying on the sensing mechanism revealed that weak chemisorption between PDA/HMSSs and formaldehyde played a significant role in the good specificity and reliability for formaldehyde detection. Furthermore, the as-prepared sensors were directly applied in measuring formaldehyde levels in shiitake mushroom, Chinese cabbage, Litopenaeus vannamei, and broccoli, where rapid detections within 30 s were achieved with high sensitivity, reusability, and good selectivity.
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