Sedimentation classification of silver colloids for surface-enhanced Raman scattering

Sheng, Rong Sheng.; Zhu, Ling; Morris, Michael D.

doi:10.1021/ac00297a030

Cited by 80 publications

(34 citation statements)

References 17 publications

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“…Several types of metal surfaces have been used in SERS applications: e.g. sols, [28] electrodes, [29,30] evaporated [31] and chemically deposited [32,33] films, compacted powders, [34,35] metallic nanoparticle arrays, [36] and nanofabricated substrates. [37] Although some enhancement in SERS is due to chemical contribution [24,38] (electronic interaction between the metal and the adsorbate), the main reason why SERS produces extraordinary enhancements is surface plasmons -the electromagnetic property of nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Near‐IR surface‐enhanced Raman spectrum of lignin

Agarwal

Reiner

2009

J Raman Spectroscopy

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Compacted powders of commercially available nano-and microparticles of silver were used to successfully induce the surfaceenhanced Raman scattering (SERS) effect in spruce milled-wood lignin (MWL). For the two silver particle sizes used in this investigation, the spectra were mostly similar. Some general characteristics of the lignin SERS spectrum are described. The SERS technique was found to be sensitive for detecting lignin. Significant spectral changes were present between the SERS and normal Raman spectra of MWL. The SERS spectrum was assigned on the basis of literature-reported vibrational assignments of lignin and its models. Based on significant changes in Raman features, we propose that the lignin is strongly adsorbed on silver.To determine whether SERS of lignin can be obtained directly from wood without its isolation, Wiley-milled spruce wood (WMW) adsorbed on silver was studied. The results indicated that not only the surface-enhancement effect was successfully induced in the WMW, but that its spectrum was similar to MWL SERS. Moreover, for WMW, no signals from the carbohydrate components were observed, and therefore, lignin was detected selectively. This nano-and microparticle-based molecularly specific method is expected to make a significant contribution in identifying and investigating lignin in various lignin-containing materials.

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Section: Introductionmentioning

confidence: 99%

Near‐IR surface‐enhanced Raman spectrum of lignin

Agarwal

Reiner

2009

J Raman Spectroscopy

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“…Numerous chemical species have been investigated, such as: organic compounds [17,[20][21][22][23][24][25][26][27][28], acids and bases [18,29,30], dyes [31][32][33][34], porphyrin-related compounds and biomolecules [9,19,[35][36][37][38]. Hildebrandt and Spiro studied Cu(II) chlorin e 6 adsorbed on Ag and Au colloids using SERRS to understand its adsorption and assign vibrational modes [9].…”

Section: Introductionmentioning

confidence: 99%

SERRS and visible extinction spectroscopy of copper chlorophyllin on silver colloids as a function of pH

House¹,

Schnitzer²

2008

Journal of Colloid and Interface Science

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“…41% 6 . The variation of the measured SERS intensity as a function of the age of the Ag colloid also represents a possible limitation to its application in analysis 6,12,13 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of Novel Ag on TiO₂ Films for Surface-Enhanced Raman Scattering

et al. 2004

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Novel Ag on TiO 2 films are generated by semiconductor photocatalysis and characterised by UV/Vis spectroscopy, SEM, AFM as well as assessed for SERS activity. The nature and thickness of the photodeposited Ag, and thus the degree of SERS activity, is controlled by the time of exposure of the TiO 2 film to UV light. All such films exhibit the optical characteristic (λmax ≅ 390 nm) of small (<20nm) Ag particles, although this feature becomes less prominent the thicker the film. The films comprise quite large (>40nm) Ag islands that grow and merge with increasing levels of Ag photodeposition.Tested with a benzotriazole dye probe, the films are SERS active; exhibiting a similar activity as that of 6nm thick vapour-deposited films. The Ag/TiO 2 films exhibit a lower residual standard deviation (ca. 25%) compared with Ag vapour-deposited films (ca. 45%), which is, however, still unacceptable for quantitative work. The sample-to-sample variance could be reduced significantly (<7%) by spinning the film during the SERS measurement. The Ag/TiO 2 films are mechanically robust and resistant to removal and damage by scratching, unlike the Ag vapour-deposited films. The Ag/TiO 2 films also exhibit no obvious loss of SERS activity when stored in the dark under otherwise ambient conditions. The possible extension of this simple, effective, method of producing Ag films for SERS, to metals other than Ag, and to semiconductors other than TiO 2 , is briefly discussed.

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Sedimentation classification of silver colloids for surface-enhanced Raman scattering

Cited by 80 publications

References 17 publications

Near‐IR surface‐enhanced Raman spectrum of lignin

Near‐IR surface‐enhanced Raman spectrum of lignin

SERRS and visible extinction spectroscopy of copper chlorophyllin on silver colloids as a function of pH

Characterization of Novel Ag on TiO₂ Films for Surface-Enhanced Raman Scattering

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Sedimentation classification of silver colloids for surface-enhanced Raman scattering

Cited by 80 publications

References 17 publications

Near‐IR surface‐enhanced Raman spectrum of lignin

Near‐IR surface‐enhanced Raman spectrum of lignin

SERRS and visible extinction spectroscopy of copper chlorophyllin on silver colloids as a function of pH

Characterization of Novel Ag on TiO2 Films for Surface-Enhanced Raman Scattering

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Characterization of Novel Ag on TiO₂ Films for Surface-Enhanced Raman Scattering