Abstract

Near-infrared surface-enhanced Raman scattering (NIR SERS) was detected with high sensitivity for two model compounds, crystal violet and the DNA base adenine, adsorbed on silver and gold colloidal particles in aqueous solutions. The NIR SERS spectra were measured with a fiber-optic probe with the use of a Ti:sapphire laser at 850 nm as the excitation source and a charge-coupled device (CCD) as the detection system. In a step to achieve the optimal electromagnetic SERS-enhancement conditions, silver and gold sols were modified to shift their extinction spectra more to the NIR region. Surface enhancement factors for both crystal violet and adenine were estimated to be on the order of 10 6 and 10 8 for gold and silver, respectively. A larger enhancement factor was observed for adenine with NIR excitation than with visible excitation. The benefits of NIR SERS and its potential applications are discussed.

Keywords

Raman scatteringCrystal violetMaterials scienceRaman spectroscopyAnalytical Chemistry (journal)Crystal (programming language)Near-infrared spectroscopyChemistryOptics

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Publication Info

Year
1994
Type
article
Volume
48
Issue
8
Pages
951-955
Citations
107
Access
Closed

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Katrin Kneipp, Ramachandra R. Dasari, Yang Wang (1994). Near-Infrared Surface-Enhanced Raman Scattering (NIR SERS) on Colloidal Silver and Gold. Applied Spectroscopy , 48 (8) , 951-955. https://doi.org/10.1366/0003702944029776

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DOI
10.1366/0003702944029776