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Issue 5, 2012
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Simultaneous UV/Vis spectroscopy and surface enhanced Raman scattering of nanoparticle formation and aggregation in levitated droplets

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Abstract

The formation and growth of hydroxylamine reduced silver nanoparticles were investigated by simultaneous Raman and UV/Vis spectroscopy coupled to an acoustic levitator as a sample holder. Based on the UV/Vis spectra, a two step particle formation mechanism with fast initial formation and adjacent coalescence can be proposed for the reduction of silver nitrate with hydroxylamine. The presence of the analyte adenine during particle formation resulted in differences in the adenine SERS signature compared to experiments, where adenine was added after particle synthesis. It was possible to monitor the adenine and sodium chloride induced aggregation of the nanoparticles and its dynamics based on both the extinction spectra and the SERS data. Correlating the information from the extinction spectra with the SERS intensity, the maximum SERS signals were observed at maximum extinction of the aggregated nanoparticle solution at the Raman excitation wavelength.

Graphical abstract: Simultaneous UV/Vis spectroscopy and surface enhanced Raman scattering of nanoparticle formation and aggregation in levitated droplets

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Publication details

The article was received on 01 Nov 2011, accepted on 05 Mar 2012 and first published on 30 Mar 2012


Article type: Paper
DOI: 10.1039/C2AY05744A
Citation: Anal. Methods, 2012,4, 1252-1258
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    Simultaneous UV/Vis spectroscopy and surface enhanced Raman scattering of nanoparticle formation and aggregation in levitated droplets

    J. Schenk, L. Tröbs, F. Emmerling, J. Kneipp, U. Panne and M. Albrecht, Anal. Methods, 2012, 4, 1252
    DOI: 10.1039/C2AY05744A

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