Ultrasensitive Chemical Analysis by Raman Spectroscopy

Kneipp, Katrin; Kneipp, Harald; Itzkan, Irving; Dasari, Ramachandra R.; Feld, Michael S.

doi:10.1021/cr980133r

Cited by 2,134 publications

(1,770 citation statements)

References 108 publications

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“…5,21,22,56,59 The different EF for different morphologies of Os NPs was expected as the Kneipp group reported earlier that the SERS intensity changes when the particles size and morphology vary. 60 The highest EF in the case of aggregated clusters is probably due to generation of a greater number of active 'hot spots'. It was reported previously that when noble metal NPs aggregate, they provide a greater number of surface active 'hot spots' at the junction of the aggregates.…”

Section: Catalysis Study On the Reduction Of 4-na Using Os Ncsmentioning

confidence: 99%

Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Ede

Nithiyanantham

Kundu

2014

Phys. Chem. Chem. Phys.

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A new route for the formation of osmium nanoparticles (NPs) having different morphologies like aggregated clusters, chain-like networks, and small spheres are reported. The synthesis was done by utilizing a simple wet-chemical method at room temperature (RT) by the reaction of OsO 4 , cetyl trimethyl ammonium bromide (CTAB), 2,7-dihydroxynaphthalene (2,7-DHN) and NaOH under 30 min of reaction. The diameter of the individual particles in all the morphologies was B1-3 nm. The synthesized materials have been tested for catalysis and SERS studies. The catalysis study was examined taking different organic nitro compounds and the catalysis rate was found superior as compared to other reports. The surface enhanced Raman scattering (SERS) study was done taking Rose Bengal (R Be) as a probe molecule and the observed enhancement factor (EF) value was found superior or comparable to most of other noble metal NPs. The overall synthesis process was simple, less time consuming and cost-effective. The enhanced catalytic and SERS activities of the Os NCs might open up a new avenue for the application in other organic catalysis reactions, SERS based detection of environmentally important trace bio-molecules and sensors.

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Section: Catalysis Study On the Reduction Of 4-na Using Os Ncsmentioning

confidence: 99%

Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Ede

Nithiyanantham

Kundu

2014

Phys. Chem. Chem. Phys.

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“…[1][2][3] It is thought that giant local fields, leading to strongly enhanced nonlinear optical responses, can be generated in the vicinity of fractal clusters of metal nanoparticles. 4 A nonlinear optical process of current interest is two-photon absorption (TPA), wherein two quanta of light are absorbed simultaneously, which provides a means for three-dimensionally resolved excitation of materials.…”

Section: Introductionmentioning

confidence: 99%

Five Orders-of-Magnitude Enhancement of Two-Photon Absorption for Dyes on Silver Nanoparticle Fractal Clusters

et al. 2002

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Strong enhancement of the two-photon absorption of organic molecules near silver nanoparticle fractal clusters has been observed and has been exploited to yield composite materials with very strong two-photon absorption and two-photon-excited fluorescence properties. Measurements on cluster films coated with chromophoric polymer or with thiol-bound chromophores give spatially-averaged enhancements of 1000 and 20 000, respectively. Two-photon fluorescence microscopy studies show that the enhancements are spatially inhomogeneous, with peak-enhancement factors of g 10 000 (polymer/cluster) and g 160 000 (thiol chromophore/cluster), and excitation frequency dependent. These results are in accord with theoretical predictions of local-field effects due to strong localization of collective plasmon modes in fractal metal clusters, and demonstrate an approach to ultrasensitive two-photon processes.

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“…Since their discovery, SERS and TERS have extensively been experimentally and theoretically studied because of their extremely high sensitivity and wide applications in qualitative and quantitative analysis by fingerprint vibrational spectroscopy, even at the single‐molecular level 7, 8, 9, 10, 11, 12, 13, 14. In addition, due to the high throughput and low energy requirements, a novel application of plasmonics in chemical reactions gains significant attention, as reported in works on dissociation of hydrogen15, 16 and water,17, 18 photochemical19, 20, 21, 22, 23 and plasmon‐driven chemical reactions,24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 etc.…”

Section: Introductionmentioning

confidence: 99%

Propagating Surface Plasmon Polaritons: Towards Applications for Remote‐Excitation Surface Catalytic Reactions

et al. 2015

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Plasmonics is a well‐established field, exploiting the interaction of light and metals at the nanoscale; with the help of surface plasmon polaritons, remote‐excitation can also be observed by using silver or gold plasmonic waveguides. Recently, plasmonic catalysis was established as a new exciting platform for heterogeneous catalytic reactions. Recent reports present remote‐excitation surface catalytic reactions as a route to enhance the rate of chemical reactions, and offer a pathway to control surface catalytic reactions. In this review, we focus on recent advanced reports on silver plasmonic waveguide for remote‐excitation surface catalytic reactions. First, the synthesis methods and characterization techniques of sivelr nanowire plasmonic waveguides are summarized, and the properties and physical mechanisms of plasmonic waveguides are presented in detail. Then, the applications of plasmonic waveguides including remote excitation fluorescence and SERS are introduced, and we focus on the field of remote‐excitation surface catalytic reactions. Finally, forecasts are made for possible future applications for the remote‐excitation surface catalysis by plasmonic waveguides in living cells.

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Ultrasensitive Chemical Analysis by Raman Spectroscopy

Cited by 2,134 publications

References 108 publications

Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Five Orders-of-Magnitude Enhancement of Two-Photon Absorption for Dyes on Silver Nanoparticle Fractal Clusters

Propagating Surface Plasmon Polaritons: Towards Applications for Remote‐Excitation Surface Catalytic Reactions

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