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HERO ID
1048232
Reference Type
Journal Article
Title
Photodeposited silver nanoparticles for on-column surface-enhanced Raman spectrometry detection in capillary electrophoresis
Author(s)
Přikryl, J; Klepárník, K; Foret, F
Year
2012
Is Peer Reviewed?
Yes
Journal
Journal of Chromatography A
ISSN:
0021-9673
EISSN:
1873-3778
Volume
1226
Page Numbers
43-47
Language
English
PMID
21831388
DOI
10.1016/j.chroma.2011.07.045
Web of Science Id
WOS:000301307200007
Abstract
A new, simple photo-deposition method of silver nanoparticles induced by laser inside a fused-silica capillary is described and tested. Silver nanoparticles are immobilized using Ar-ion laser beam of a wavelength of 488 nm and power of 3.6 mW for 60 min. The photodeposited compact spot of a size of ∼10 μm is temporary and spatially stable and resistant to a hydrodynamic flow. The deposit has very good properties for surface-enhanced Raman scattering and serves well for detection in capillary electrophoresis. The advantage of this approach is that neither the silver nanoparticles nor the chemicals for their preparation are components of the background electrolyte during the electrophoretic separation. Thus, the substrate formation and separation of analytes are two independent processes and can be performed under their optimum conditions. The zone broadening due to the sorption of analytes on the immobilized nanoparticles can be significantly reduced by an addition of 20% solution of methanol. The efficiency of capillary electrophoresis and detection selectivity of surface-enhanced Raman scattering induced by He-Ne laser at 632.8 nm is demonstrated by the 3D electropherograms of rhodamines 123 and B as model samples. The limits of detection of about 49 and 150 fmol (1 and 2 μM) have been reached for rhodamine B and 123, respectively.
Keywords
SERS; Capillary electrophoresis; Photodeposition; Metal nanoparticle
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Methanol (Non-Cancer)
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