Highly porous gold supraparticles as surface-enhanced Raman spectroscopy (SERS) substrates for sensitive detection of environmental contaminants

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dc.contributor.authorKang, Sejuen
dc.contributor.authorWang, Weien
dc.contributor.authorRahman, Asifuren
dc.contributor.authorNam, Wonilen
dc.contributor.authorZhou, Weien
dc.contributor.authorVikesland, Peter J.en
dc.date.accessioned2023-02-13T16:03:02Zen
dc.date.available2023-02-13T16:03:02Zen
dc.date.issued2022-11-15en
dc.date.updated2023-02-12T12:48:38Zen
dc.description.abstractSurface-enhanced Raman spectroscopy (SERS) has great potential as an analytical technique for environmental analyses. In this study, we fabricated highly porous gold (Au) supraparticles (i.e., ∼100 μm diameter agglomerates of primary nano-sized particles) and evaluated their applicability as SERS substrates for the sensitive detection of environmental contaminants. Facile supraparticle fabrication was achieved by evaporating a droplet containing an Au and polystyrene (PS) nanoparticle mixture on a superamphiphobic nanofilament substrate. Porous Au supraparticles were obtained through the removal of the PS phase by calcination at 500 °C. The porosity of the Au supraparticles was readily adjusted by varying the volumetric ratios of Au and PS nanoparticles. Six environmental contaminants (malachite green isothiocyanate, rhodamine B, benzenethiol, atrazine, adenine, and gene segment) were successfully adsorbed to the porous Au supraparticles, and their distinct SERS spectra were obtained. The observed linear dependence of the characteristic Raman peak intensity for each environmental contaminant on its aqueous concentration reveals the quantitative SERS detection capability by porous Au supraparticles. The limit of detection (LOD) for the six environmental contaminants ranged from ∼10 nM to ∼10 μM, which depends on analyte affinity to the porous Au supraparticles and analyte intrinsic Raman cross-sections. The porous Au supraparticles enabled multiplex SERS detection and maintained comparable SERS detection sensitivity in wastewater influent. Overall, we envision that the Au supraparticles can potentially serve as practical and sensitive SERS devices for environmental analysis applications.en
dc.description.versionPublished versionen
dc.format.extentPages 32803-32812en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1039/d2ra06248hen
dc.identifier.eissn2046-2069en
dc.identifier.issn2046-2069en
dc.identifier.issue51en
dc.identifier.orcidVikesland, Peter [0000-0003-2654-5132]en
dc.identifier.orcidZhou, Wei [0000-0002-5257-3885]en
dc.identifier.otherPMC9665105en
dc.identifier.otherd2ra06248h (PII)en
dc.identifier.pmid36425178en
dc.identifier.urihttp://hdl.handle.net/10919/113817en
dc.identifier.volume12en
dc.language.isoenen
dc.publisherRoyal Society of Chemistryen
dc.relation.urihttps://www.ncbi.nlm.nih.gov/pubmed/36425178en
dc.rightsCreative Commons Attribution-NonCommercial 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/en
dc.subjectNanotechnologyen
dc.subjectBioengineeringen
dc.titleHighly porous gold supraparticles as surface-enhanced Raman spectroscopy (SERS) substrates for sensitive detection of environmental contaminantsen
dc.title.serialRSC Advancesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherJournal Articleen
dcterms.dateAccepted2022-11-09en
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Engineeringen
pubs.organisational-group/Virginia Tech/Engineering/Civil & Environmental Engineeringen
pubs.organisational-group/Virginia Tech/Engineering/Electrical and Computer Engineeringen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Engineering/COE T&R Facultyen

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