Real-time optofluidic surface-enhanced Raman spectroscopy based on a graphene oxide/gold nanorod nanocomposite

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dc.contributor.authorVianna P.G.
dc.contributor.authorGrasseschi D.
dc.contributor.authorDomingues S.H.
dc.contributor.authorDe Matos C.J.S.
dc.date.accessioned2024-03-12T23:56:53Z
dc.date.available2024-03-12T23:56:53Z
dc.date.issued2018
dc.description.abstract© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.We demonstrate a glass microcapillary fiber as an optofluidic platform for surface enhanced Raman spectroscopy (SERS), the inner walls of which are coated with a graphene oxide (GO)/gold nanorod (AuNR) nanocomposite. A simple thermal method is used for the coating, allowing for the continuous deposition of the nanocomposite without surface functionalization. We show that the AuNRs can be directly and nondestructively identified on the GO inside the capillaries via identification of the Au-Br SERS peak, as Br- ions from the AuNR synthesis remain on their surface. The coated microcapillary platform is, then, used as a stable SERS substrate for the detection of Rhodamine 6G (R6G) and Rhodamine 640 (RH640) at concentrations down to 10−7 and 10−9 M, respectively. As the required sample volumes are as low as a few hundred nanoliters, down to ~75 femtograms of analyte can be detected. The fiber also allows for the detection of the molecules at acquisition times as low as 0.05 s, indicating the platform’s suitability for real-time sensing.
dc.description.firstpage22698
dc.description.issuenumber18
dc.description.lastpage22708
dc.description.volume26
dc.identifier.doi10.1364/OE.26.022698
dc.identifier.issn1094-4087
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/35475
dc.relation.ispartofOptics Express
dc.rightsAcesso Aberto
dc.titleReal-time optofluidic surface-enhanced Raman spectroscopy based on a graphene oxide/gold nanorod nanocomposite
dc.typeArtigo
local.scopus.citations11
local.scopus.eid2-s2.0-85052701531
local.scopus.subjectAcquisition time
local.scopus.subjectContinuous deposition
local.scopus.subjectMicro-capillaries
local.scopus.subjectReal time sensing
local.scopus.subjectSERS substrate
local.scopus.subjectSurface enhanced Raman spectroscopy
local.scopus.subjectSurface Functionalization
local.scopus.subjectThermal methods
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85052701531&origin=inward
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