Cargando…
SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides
Health risks posed by the exposure to trace amounts of pesticide residue in agricultural products have gained a lot of concerns, due to their neurotoxic nature. The applications of surface-enhanced Raman Scattering (SERS) as a detection technique have consistently shown its potential as a rapid and...
Autores principales: | , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6566408/ https://www.ncbi.nlm.nih.gov/pubmed/31035555 http://dx.doi.org/10.3390/nano9050664 |
_version_ | 1783426845714153472 |
---|---|
author | Sitjar, Jaya Liao, Jiunn-Der Lee, Han Liu, Bernard Haochih Fu, Wei-en |
author_facet | Sitjar, Jaya Liao, Jiunn-Der Lee, Han Liu, Bernard Haochih Fu, Wei-en |
author_sort | Sitjar, Jaya |
collection | PubMed |
description | Health risks posed by the exposure to trace amounts of pesticide residue in agricultural products have gained a lot of concerns, due to their neurotoxic nature. The applications of surface-enhanced Raman Scattering (SERS) as a detection technique have consistently shown its potential as a rapid and sensitive means with minimal sample preparation. In this study, gold nanoparticles (Au NPs) in elliptical shapes were collected into a layer of ordered zirconia concave pores. The porous zirconia layer (pZrO(2)) was then deposited with Au NPs, denoted as Au NPs (x)/pZrO(2), where x indicates the deposition thickness of Au NPs in nm. In the concave structure of pZrO(2), Au-ZrO(2) and Au-Au interactions provide a synergistic and physical mechanism of SERS, which is anticipated to collect and amplify SERS signals and thereafter improve the enhancement factor (EF) of Au NPs/pZrO(2). By taking Rhodamine 6G (R6G) as the test molecule, EF of Au NPs/pZrO(2) might reach to 7.0 × 10(7). Au NPs (3.0)/pZrO(2) was then optimized and competent to detect pesticides, e.g., phosmet and carbaryl at very low concentrations, corresponding to the maximum residue limits of each, i.e., 0.3 ppm and 0.2 ppm, respectively. Au NPs (3.0)/pZrO(2) also showed the effectiveness of distinguishing between phosmet and carbaryl under mixed conditions. Due to the strong affinities of the phosphoric groups and sulfur in phosmet to the Au NPs (3.0)/pZrO(2), the substrate exhibited selective detection to this particular pesticide. In this study, Au NPs (3.0)/pZrO(2) has thus demonstrated trace detection of residual pesticides, due to the substrate design that intended to provide collective amplification of SERS. |
format | Online Article Text |
id | pubmed-6566408 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-65664082019-06-17 SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides Sitjar, Jaya Liao, Jiunn-Der Lee, Han Liu, Bernard Haochih Fu, Wei-en Nanomaterials (Basel) Article Health risks posed by the exposure to trace amounts of pesticide residue in agricultural products have gained a lot of concerns, due to their neurotoxic nature. The applications of surface-enhanced Raman Scattering (SERS) as a detection technique have consistently shown its potential as a rapid and sensitive means with minimal sample preparation. In this study, gold nanoparticles (Au NPs) in elliptical shapes were collected into a layer of ordered zirconia concave pores. The porous zirconia layer (pZrO(2)) was then deposited with Au NPs, denoted as Au NPs (x)/pZrO(2), where x indicates the deposition thickness of Au NPs in nm. In the concave structure of pZrO(2), Au-ZrO(2) and Au-Au interactions provide a synergistic and physical mechanism of SERS, which is anticipated to collect and amplify SERS signals and thereafter improve the enhancement factor (EF) of Au NPs/pZrO(2). By taking Rhodamine 6G (R6G) as the test molecule, EF of Au NPs/pZrO(2) might reach to 7.0 × 10(7). Au NPs (3.0)/pZrO(2) was then optimized and competent to detect pesticides, e.g., phosmet and carbaryl at very low concentrations, corresponding to the maximum residue limits of each, i.e., 0.3 ppm and 0.2 ppm, respectively. Au NPs (3.0)/pZrO(2) also showed the effectiveness of distinguishing between phosmet and carbaryl under mixed conditions. Due to the strong affinities of the phosphoric groups and sulfur in phosmet to the Au NPs (3.0)/pZrO(2), the substrate exhibited selective detection to this particular pesticide. In this study, Au NPs (3.0)/pZrO(2) has thus demonstrated trace detection of residual pesticides, due to the substrate design that intended to provide collective amplification of SERS. MDPI 2019-04-27 /pmc/articles/PMC6566408/ /pubmed/31035555 http://dx.doi.org/10.3390/nano9050664 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 Liu, Bernard Haochih Fu, Wei-en SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides |
title | SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides |
title_full | SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides |
title_fullStr | SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides |
title_full_unstemmed | SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides |
title_short | SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides |
title_sort | sers-active substrate with collective amplification design for trace analysis of pesticides |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6566408/ https://www.ncbi.nlm.nih.gov/pubmed/31035555 http://dx.doi.org/10.3390/nano9050664 |
work_keys_str_mv | AT sitjarjaya sersactivesubstratewithcollectiveamplificationdesignfortraceanalysisofpesticides AT liaojiunnder sersactivesubstratewithcollectiveamplificationdesignfortraceanalysisofpesticides AT leehan sersactivesubstratewithcollectiveamplificationdesignfortraceanalysisofpesticides AT liubernardhaochih sersactivesubstratewithcollectiveamplificationdesignfortraceanalysisofpesticides AT fuweien sersactivesubstratewithcollectiveamplificationdesignfortraceanalysisofpesticides |