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Volume 10
Issue 8
10.3390/coatings10080751
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Article

Surface Imprinted Layer of Cypermethrin upon Au Nanoparticle as a Specific and Selective Coating for the Detection of Template Pesticide Molecules

by
Jaya Sitjar
1,
Ying-Chen Hou
1,
Jiunn-Der Liao
1,2,*,
Han Lee
1,
Hong-Zheng Xu
1,
Wei-En Fu
3 and
Guo Dung Chen
3
1
Department of Materials Science and Engineering, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan
2
Medical Device Innovation Center, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan
3
Center for Measurement Standards, Industrial Technology Research Institute, No. 321, Kuang Fu Road, Sec. 2, Hsinchu 300, Taiwan
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(8), 751; https://doi.org/10.3390/coatings10080751
Submission received: 30 June 2020 / Revised: 29 July 2020 / Accepted: 30 July 2020 / Published: 1 August 2020
(This article belongs to the Special Issue Nanofabricated Surfaces for Biomedical Applications)
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Abstract

The detection of specific pesticides on food products is essential as these substances pose health risks due to their toxicity. The use of surface-enhanced Raman spectroscopy (SERS) takes advantage of the straightforward technique to obtain fingerprint spectra of target analytes. In this study, SERS-active substrates are made using Au nanoparticles (NPs) coated with a layer of polymer and followed by imprinting with a pesticide–Cypermethrin, as a molecularly imprinted polymer (MIP). Cypermethrin was eventually removed and formed as template cavities, then denoted as Au NP/MIP, to capture the analogous molecules. The captured molecules situated in-between the areas of high electromagnetic field formed by plasmonic Au NPs result in an effect of SERS. The formation of Au NP/MIP was, respectively, studied through morphological analysis using transmission electron microscopy (TEM) and compositional analysis using X-ray photoelectron spectroscopy (XPS). Two relatively similar pesticides, Cypermethrin and Permethrin, were used as analytes. The results showed that Au NP/MIP was competent to detect both similar molecules despite the imprint being made only by Cypermethrin. Nevertheless, Au NP/MIP has a limited number of imprinted cavities that result in sensing only low concentrations of a pesticide solution. Au NP/MIP is thus a specific design for detecting analogous molecules similar to its template structure.
Keywords: surface-enhanced Raman spectroscopy; gold nanoparticles; molecularly imprinted polymer; Cypermethrin; Permethrin surface-enhanced Raman spectroscopy; gold nanoparticles; molecularly imprinted polymer; Cypermethrin; Permethrin

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MDPI and ACS Style

Sitjar, J.; Hou, Y.-C.; Liao, J.-D.; Lee, H.; Xu, H.-Z.; Fu, W.-E.; Chen, G.D. Surface Imprinted Layer of Cypermethrin upon Au Nanoparticle as a Specific and Selective Coating for the Detection of Template Pesticide Molecules. Coatings 2020, 10, 751. https://doi.org/10.3390/coatings10080751

AMA Style

Sitjar J, Hou Y-C, Liao J-D, Lee H, Xu H-Z, Fu W-E, Chen GD. Surface Imprinted Layer of Cypermethrin upon Au Nanoparticle as a Specific and Selective Coating for the Detection of Template Pesticide Molecules. Coatings. 2020; 10(8):751. https://doi.org/10.3390/coatings10080751

Chicago/Turabian Style

Sitjar, Jaya, Ying-Chen Hou, Jiunn-Der Liao, Han Lee, Hong-Zheng Xu, Wei-En Fu, and Guo Dung Chen. 2020. "Surface Imprinted Layer of Cypermethrin upon Au Nanoparticle as a Specific and Selective Coating for the Detection of Template Pesticide Molecules" Coatings 10, no. 8: 751. https://doi.org/10.3390/coatings10080751

APA Style

Sitjar, J., Hou, Y.-C., Liao, J.-D., Lee, H., Xu, H.-Z., Fu, W.-E., & Chen, G. D. (2020). Surface Imprinted Layer of Cypermethrin upon Au Nanoparticle as a Specific and Selective Coating for the Detection of Template Pesticide Molecules. Coatings, 10(8), 751. https://doi.org/10.3390/coatings10080751

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