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Titolo:
Flow analysis-based surface-enhanced Raman spectroscopy employing exchangeable microbeads as SERS-active surfaces
Autore:
Lendl, B; Ehmoser, H; Frank, J; Schindler, R;
Indirizzi:
Vienna Univ Technol, Inst Analyt Chem, A-1060 Vienna, Austria Vienna Univ Technol Vienna Austria A-1060 t Chem, A-1060 Vienna, Austria
Titolo Testata:
APPLIED SPECTROSCOPY
fascicolo: 7, volume: 54, anno: 2000,
pagine: 1012 - 1018
SICI:
0003-7028(200007)54:7<1012:FASRSE>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
INJECTION ANALYSIS; SILVER ELECTRODE; LIQUID-CHROMATOGRAPHY; DETECTION SYSTEM; STREAMS; SPECTROMETRY; SCATTERING; ADSORPTION; CELL;
Keywords:
SERS; flow injection; renewable surfaces; Ag-sols; nicotinic acid;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Lendl, B Vienna Univ Technol, Inst Analyt Chem, Getreidemarkt 9-151, A-1060 Vienna,Austria Vienna Univ Technol Getreidemarkt 9-151 Vienna Austria A-1060 ia
Citazione:
B. Lendl et al., "Flow analysis-based surface-enhanced Raman spectroscopy employing exchangeable microbeads as SERS-active surfaces", APPL SPECTR, 54(7), 2000, pp. 1012-1018

Abstract

This paper reports on a new fully automated approach for highly sensitive and robust surface-enhanced Raman spectroscopic (SERS) detection using flowsystems. An aqueous solution of silver nitrate was reduced by the additionof sodium borohydride and the thus formed silver sols adsorbed on Sephadexanion exchanger microbeads (dry bead size: 50-120 mu m) present in the reaction mixture. In this way microbeads carrying a SERS-active layer were generated that could be easily pumped in the how system without facing problems due to Ag-sol adsorption on the Teflon(R) tubing. After online generationof the SERS-active microbeads, the analyte (test analyte: nicotinic acid) was added, and the homogeneous SERS-microbead-analyte suspension pumped into a specially designed dow cell where the beads were retained and the SERS spectra measured with a Fourier transform (FT)-Raman instrument with a laser wavelength of 1064 nm. Afterwards the SERS microbeads were discarded by flow reversal and new, freshly prepared SERS microbeads together with the analyte could be introduced automatically into the flow system. The developedmethod is characterized by complete computer control of all operation steps, high sensitivity of the SERS measurement, high precision, and long-term stability. The concentration dependence of the SERS signals was investigated over a range from 5.10(-6) M to 0.1 M nicotinic acid. The signal intensities increased until 1 mM, after which no further rise in the SERS intensities was found. Typical precision achieved was 8% throughout the whole calibration range.

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Documento generato il 07/04/20 alle ore 22:43:56