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Lucht, S. ; Murphy, T. ; Schmidt, Heinar ; Kronfeldt, Heinz-Detlef:
Optimized recipe for sol-gel-based SERS substrates.
In: Journal of Raman Spectroscopy.
Bd. 31
(2000)
Heft 11
.
- S. 1017-1022.
ISSN 1097-4555
DOI: https://doi.org/10.1002/1097-4555(200011)31:11<1017::AID-JRS638>3.0.CO;2-V
Abstract
The aim of this study was to develop further surface-enhanced Raman scattering (SERS) substrates appropriate for the in situ. environmental determination of chemicals in sea-water important for global environmental problems. By encapsulating silver colloids in a sol-gel-derived xerogel, SEWS-active coatings were produced with the high mechanical and chemical stability required for underwater field measurements, A flow-through system was used which simulates measurements under real how conditions. Substrates were optimized regarding sensitivity to different analytes and long-term stability by varying solvent type, pH and sol-gel precursors. The substrates were characterized by their SEWS activity and calibration functions of the Langmuir isotherm type were found for a variety of aromatic hydrocarbons. Limits of detection as low as 9 ppb for phenylacetylene and 135 ppb for biphenyl were achieved. Detailed tests on long-term stability in sea-water yielded a substrate half-life of 13 days, which resulted in a substrate lifetime of at least 5 weeks.