Recent approaches toward creation of hot spots for SERS detection

Shiohara, Amane; Wang, Yusong; Liz‐Marzán, Luis M.

doi:10.1016/j.jphotochemrev.2014.09.001

Cited by 261 publications

(182 citation statements)

References 175 publications

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“…9,43 Therefore, high SERS signals are expected for Raman-active molecules trapped at such strong localized EM fields. 44 We used 4-MBA as Raman reporter molecule, which provides high SERS signal under 785 nm excitation and is known to strongly bind to the Au surface. In this case, the presence of 4-MBA is particularly useful, as it has been not only been reported to prevent Au NS reshaping through thiol binding, 45,46 but additionally the negative charges at the carboxylic groups oppose particle aggregation.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Gold Nanostar-Coated Polystyrene Beads as Multifunctional Nanoprobes for SERS Bioimaging

et al. 2016

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Hybrid colloidal nanocomposites comprising polystyrene beads and plasmonic gold nanostars are reported as multifunctional optical nanoprobes. Such self-assembled structures are excellent Raman enhancers for bioapplications as they feature plasmon modes in the near-infrared "first biological transparency window". In this proof of concept study, we used 4-mercaptobenzoic acid as a Raman-active molecule to optimize the density of gold nanostars on polystyrene beads, improving SERS performance and thereby allowing in vitro cell culture imaging. Interestingly, intermediate gold nanostar loadings were found to yield higher SERS response, which was confirmed by electromagnetic modeling. These engineered hybrid nanostructures notably improve the possibilities of using gold nanostars as SERS tags. Additionally, when fluorescently labeled polystyrene beads are used as colloidal carriers, the composite particles can be applied as promising tools for multimodal bioimaging.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Gold Nanostar-Coated Polystyrene Beads as Multifunctional Nanoprobes for SERS Bioimaging

et al. 2016

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“…Strong SERS effects obtained using nanoplasmonic structures or NPs allows the detection of molecules at extremely low concentrations, down to a single molecule level [17,18]. One way to reach a high FE is to create structures with well-known "hot spots" [18][19][20][21][22]. These socalled hot spots are created at interparticle gaps near 1-3 nm.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of two-photon photoluminescence and SERS for low-coverage gold films

Novikov¹,

Beermann²,

Frydendahl³

et al. 2016

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“…[1][2][3][4][5][6][7][8] A number of methods have been reported for the synthesis of AuNS, through either seedless or seed-mediated approaches, using capping molecules such as poly( N -vinylpyrrolidone) (PVP) or cetyltrimethylammonium bromide (CTAB), but also under surfactant-free conditions. [ 2,7,[9][10][11] Whereas PVPcapped AuNS can be synthesized with tailored dimensions and optical properties, [ 2,12 ] and used for ultrasensitive SERS detection, [ 13 ] the SERS signal is affected by hindered analyte chemisorption due to the adsorbed polymer, which can be DOI: 10.1002/smll.201500703…”

Section: Introductionmentioning

confidence: 99%

Stabilization and Encapsulation of Gold Nanostars Mediated by Dithiols

Wang

Serrano

Sentosun

et al. 2015

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Surface chemistry plays a pivotal role in regulating the morphology of nanoparticles, maintaining colloidal stability, and mediating the interaction with target analytes toward practical applications such as surface-enhanced Raman scattering (SERS)-based sensing and imaging. The use of a binary ligand mixture composed of 1,4-benzenedithiol (BDT) and hexadecyltrimethylammonium chloride (CTAC) to provide gold nanostars with long-term stability is reported. This is despite BDT being a bifunctional ligand, which usually leads to bridging and loss of colloidal stability. It is found however that neither BDT nor CTAC alone are able to provide sufficient colloidal and chemical stability. BDT-coated Au nanostars are additionally used as seeds to direct the encapsulation with a gold outer shell, leading to the formation of unusual nanostructures including semishell-coated gold nanostars, which are characterized by high-resolution electron microscopy and electron tomography. Finally, BDT is exploited as a probe to reveal the enhanced local electric fields in the different nanostructures, showing that the semishell configuration provides significantly high SERS signals as compared to other core-shell configurations obtained during seeded growth, including full shells.

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Recent approaches toward creation of hot spots for SERS detection

Cited by 261 publications

References 175 publications

Gold Nanostar-Coated Polystyrene Beads as Multifunctional Nanoprobes for SERS Bioimaging

Gold Nanostar-Coated Polystyrene Beads as Multifunctional Nanoprobes for SERS Bioimaging

Enhancement of two-photon photoluminescence and SERS for low-coverage gold films

Stabilization and Encapsulation of Gold Nanostars Mediated by Dithiols

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