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Open AccessFeature PaperArticle

Flexible and Reusable Ag Coated TiO2 Nanotube Arrays for Highly Sensitive SERS Detection of Formaldehyde

1
School of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, China
2
Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
*
Authors to whom correspondence should be addressed.
Molecules 2020, 25(5), 1199; https://doi.org/10.3390/molecules25051199
Received: 9 February 2020 / Revised: 26 February 2020 / Accepted: 3 March 2020 / Published: 6 March 2020
Quantitative analysis of formaldehyde (HCHO, FA), especially at low levels, in various environmental media is of great importance for assessing related environmental and human health risks. A highly efficient and convenient FA detection method based on surface-enhanced Raman spectroscopy (SERS) technology has been developed. This SERS-based method employs a reusable and soft silver-coated TiO2 nanotube array (TNA) material, such as an SERS substrate, which can be used as both a sensing platform and a degradation platform. The Ag-coated TNA exhibits superior detection sensitivity with high reproducibility and stability compared with other SERS substrates. The detection of FA is achieved using the well-known redox reaction of FA with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AHMT) at room temperature. The limit of detection (LOD) for FA is 1.21 × 10−7 M. In addition, the stable catalytic performance of the array allows the degradation and cleaning of the AHMT-FA products adsorbed on the array surface under ultraviolet irradiation, making this material recyclable. This SERS platform displays a real-time monitoring platform that combines the detection and degradation of FA. View Full-Text
Keywords: formaldehyde; SERS; Raman; semiconductor; TiO2 formaldehyde; SERS; Raman; semiconductor; TiO2
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MDPI and ACS Style

Zhu, T.; Wang, H.; Zang, L.; Jin, S.; Guo, S.; Park, E.; Mao, Z.; Jung, Y.M. Flexible and Reusable Ag Coated TiO2 Nanotube Arrays for Highly Sensitive SERS Detection of Formaldehyde. Molecules 2020, 25, 1199.

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