Flexible and Reusable Ag Coated TiO<sub>2</sub> Nanotube Arrays for Highly Sensitive SERS Detection of Formaldehyde

Tong Zhu; Hang Wang; Libin Zang; Sila Jin; Shuang Guo; Eungyeong Park; Zhu Mao; Young  Mee Jung

doi:10.3390/molecules25051199

Molecules (Mar 2020)

Flexible and Reusable Ag Coated TiO<sub>2</sub> Nanotube Arrays for Highly Sensitive SERS Detection of Formaldehyde

Tong Zhu,
Hang Wang,
Libin Zang,
Sila Jin,
Shuang Guo,
Eungyeong Park,
Zhu Mao,
Young Mee Jung

Affiliations

Tong Zhu: School of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, China
Hang Wang: School of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, China
Libin Zang: Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
Sila Jin: Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
Shuang Guo: Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
Eungyeong Park: Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
Zhu Mao: School of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, China
Young Mee Jung: Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea

DOI: https://doi.org/10.3390/molecules25051199
Journal volume & issue: Vol. 25, no. 5
p. 1199

Abstract

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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.

Published in Molecules

ISSN: 1420-3049 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Organic chemistry
Website: http://www.mdpi.com/journal/molecules

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