期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 339, 期 1-3, 页码 60-67出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2009.01.018
关键词
Silver colloids; SERS spectroscopy; gamma-Radiolysis; Nanoparticles; Fungicide
资金
- Consiglio Nazionale delle Ricerche (CNR-Italy)
- Consejo Superior de Investigaciones Cientificas (CSIC-Spain)
- Direccion General de Investigacion (Ministerio de Educacion y Ciencia) [FIS2007-63065]
- Comunidad Autonoma de Madrid [S-0505/TIC/0191 MICROSERES]
This paper is concerned with the surface enhanced Raman scattering (SERS) activity of silver colloids obtained by a radiolytic method. Ag nanoparticles were successfully prepared by gamma-radiolysis of Ag+ aqueous solution containing t-BuOH or i-PrOH at room temperature without the addition of aggregating or stabilizing substances. The metal colloids were characterised by UV/vis spectroscopy and scanning electron microscopy. Many experimental conditions were tested (i.e. Ag+ concentration, dose and +OH scavenger alcohol) in order to obtain the best controlled size of nanoparticles as well as the high stability of colloidal silver with time. The use of relatively low irradiation doses and Ag+ concentrations allowed to obtain very stable suspensions of Ag nanoparticles without adding any colloid stabiliser, a source of further Spurious bands in the Raman spectra. The suitability of the gamma-irradiated colloids in SERS spectroscopy was tested by using thiram, a known fungicide. Micro-SERS and SERS spectra of good quality were achieved at very low concentration of adsorbate, without the overlapping of impurities normally present in conventional citrate colloidal suspensions of Ag nanoparticles. (C) 2009 Elsevier B.V. All rights reserved.
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