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Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin

Nanostructures with spikes (NSPs) have been a subject of several surface-enhanced Raman scattering (SERS) applications owing to their significant Raman signal enhancement brought about by the combined effects of interspike coupling and the accumulated induction on the tips of spikes. Thus, NSPs offe...

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Autores principales: Sitjar, Jaya, Liao, Jiunn-Der, Lee, Han, Pan, Li Peng, Liu, Bernard Haochih, Fu, Wei-en, Chen, Guo Dung
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6956212/
https://www.ncbi.nlm.nih.gov/pubmed/31835301
http://dx.doi.org/10.3390/nano9121750
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author Sitjar, Jaya
Liao, Jiunn-Der
Lee, Han
Pan, Li Peng
Liu, Bernard Haochih
Fu, Wei-en
Chen, Guo Dung
author_facet Sitjar, Jaya
Liao, Jiunn-Der
Lee, Han
Pan, Li Peng
Liu, Bernard Haochih
Fu, Wei-en
Chen, Guo Dung
author_sort Sitjar, Jaya
collection PubMed
description Nanostructures with spikes (NSPs) have been a subject of several surface-enhanced Raman scattering (SERS) applications owing to their significant Raman signal enhancement brought about by the combined effects of interspike coupling and the accumulated induction on the tips of spikes. Thus, NSPs offer great potential as a SERS-active substrate for relevant applications that require a high density of enhanced “hot spots”. In this study, Ag NSPs were synthesized in varying degrees of agglomeration and were thereafter deposited onto a transparent adhesive tape as a flexible substrate for SERS applications, specifically, in the detection of trace amounts of pesticides. These flexible substrates were referred to as Ag NSPs/tape and optimized with an enhancement factor (EF) of ca. 1.7 × 10(7). A strong resulting signal enhancement could be attributed to an optimal degree of agglomeration and, consequently, the distances among/between spikes. Long spikes on the synthesized core of Ag NSPs tend to be loosely spaced, which are suitable in detecting relatively large molecules that could access the spaces among the spikes where “hot spots” are generally formed. Since one side of the transparent tape is adhesive, the paste-and-peel off method was successful in obtaining phosmet and carbaryl residues from apple peels as reflected in the acquired SERS spectra. In situ trace detection of the pesticides at low concentrations down to 10(−7) M could be demonstrated. In situ trace detection of mixed pesticides was possible as the characteristic peaks of both pesticides were observed in equimolar mixtures of the analytes at 10(−2) to 10(−4) M. This study is, thus, premised upon applying for in situ trace detection on e.g., fruit skin.
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spelling pubmed-69562122020-01-23 Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin Sitjar, Jaya Liao, Jiunn-Der Lee, Han Pan, Li Peng Liu, Bernard Haochih Fu, Wei-en Chen, Guo Dung Nanomaterials (Basel) Article Nanostructures with spikes (NSPs) have been a subject of several surface-enhanced Raman scattering (SERS) applications owing to their significant Raman signal enhancement brought about by the combined effects of interspike coupling and the accumulated induction on the tips of spikes. Thus, NSPs offer great potential as a SERS-active substrate for relevant applications that require a high density of enhanced “hot spots”. In this study, Ag NSPs were synthesized in varying degrees of agglomeration and were thereafter deposited onto a transparent adhesive tape as a flexible substrate for SERS applications, specifically, in the detection of trace amounts of pesticides. These flexible substrates were referred to as Ag NSPs/tape and optimized with an enhancement factor (EF) of ca. 1.7 × 10(7). A strong resulting signal enhancement could be attributed to an optimal degree of agglomeration and, consequently, the distances among/between spikes. Long spikes on the synthesized core of Ag NSPs tend to be loosely spaced, which are suitable in detecting relatively large molecules that could access the spaces among the spikes where “hot spots” are generally formed. Since one side of the transparent tape is adhesive, the paste-and-peel off method was successful in obtaining phosmet and carbaryl residues from apple peels as reflected in the acquired SERS spectra. In situ trace detection of the pesticides at low concentrations down to 10(−7) M could be demonstrated. In situ trace detection of mixed pesticides was possible as the characteristic peaks of both pesticides were observed in equimolar mixtures of the analytes at 10(−2) to 10(−4) M. This study is, thus, premised upon applying for in situ trace detection on e.g., fruit skin. MDPI 2019-12-09 /pmc/articles/PMC6956212/ /pubmed/31835301 http://dx.doi.org/10.3390/nano9121750 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Sitjar, Jaya
Liao, Jiunn-Der
Lee, Han
Pan, Li Peng
Liu, Bernard Haochih
Fu, Wei-en
Chen, Guo Dung
Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin
title Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin
title_full Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin
title_fullStr Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin
title_full_unstemmed Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin
title_short Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin
title_sort ag nanostructures with spikes on adhesive tape as a flexible sers-active substrate for in situ trace detection of pesticides on fruit skin
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6956212/
https://www.ncbi.nlm.nih.gov/pubmed/31835301
http://dx.doi.org/10.3390/nano9121750
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