2012
DOI: 10.1039/c2nr31035j
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Highly reproducible and sensitive surface-enhanced Raman scattering from colloidal plasmonic nanoparticle via stabilization of hot spots in graphene oxide liquid crystal

Abstract: Although it is now well recognized that plasmonic gold/silver nanoparticle based aggregates having electromagnetic hot spots are responsible for high sensitivity in surface-enhanced Raman spectroscopy (SERS), the high yield and reproducible production of such nanostructures are challenging and limit their practical application. Here we show a graphene oxide (GO) based approach in generating stable electromagnetic hot spots with high yield from colloidal plasmonic nanoparticles that leads to highly reproducible… Show more

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Cited by 50 publications
(56 citation statements)
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“…This is a result of signal intensity varying unpredictably from sample to sample that prevents the method from being used for quantitative analysis. This is a well‐known issue, and large effort is made to develop methods of sample preparation to obtain reproducible SERS enhancement . In this work, the use of hydrophobic aluminum oxide surface as a substrate and a sealed chamber for drying of the colloidal drops allowed obtaining nearly uniform distribution of Ag NPs in the drops' area and avoid the coffee‐ring formation.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…This is a result of signal intensity varying unpredictably from sample to sample that prevents the method from being used for quantitative analysis. This is a well‐known issue, and large effort is made to develop methods of sample preparation to obtain reproducible SERS enhancement . In this work, the use of hydrophobic aluminum oxide surface as a substrate and a sealed chamber for drying of the colloidal drops allowed obtaining nearly uniform distribution of Ag NPs in the drops' area and avoid the coffee‐ring formation.…”
Section: Resultsmentioning
confidence: 99%
“…This is a well-known issue, and large effort is made to develop methods of sample preparation to obtain reproducible SERS enhancement. [43][44][45][46] In this work, the use of hydrophobic aluminum oxide surface as a substrate and a sealed chamber for drying of the colloidal drops allowed obtaining nearly uniform distribution of Ag NPs in the drops' area and avoid the coffee-ring formation. Despite the fact that high reproducibility was not yet achieved, this implies that strict control of sample preparation conditions could eventually lead to creation of reproducible selfassembled layers of NPs that could then be used for reproducible SERS enhancement and quantitative analysis.…”
Section: Resultsmentioning
confidence: 99%
“…And the appropriate spacing of these nanoparticles could generate super‐enhancing electromagnetic hot spots through plasma coupling effect . In addition, chemical enhancement also played an important role in SERS . When laser irradiated the metal surface of Au@PS‐OH substrate, it would induce the charge transfer between metal nanoparticle and nitrofurantoin molecule.…”
Section: Resultsmentioning
confidence: 99%
“…It is well known that Raman intensity of the molecules located near or between the metal nanoparticles can be enhanced by several orders of magnitude due to the remarkably enhanced localized electromagnetic field in the vicinity of metal nanostructures caused by localized surface plasmons resonance effect 6 . As demonstrated experimentally and theoretically, the electromagnetic field distribution is governed by the boundary conditions of the resonance; the particle size and distance are of great importance to the SERS activity 21 . In our design, graphene is employed as a fluorescence quencher, and gold nanoislands are simultaneously used to enhance the localized light intensity.…”
Section: Introductionmentioning
confidence: 99%