کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
596139 1454033 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fabrication of Ag nanoparticles by γ-irradiation: Application to surface-enhanced Raman spectroscopy of fungicides
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Fabrication of Ag nanoparticles by γ-irradiation: Application to surface-enhanced Raman spectroscopy of fungicides
چکیده انگلیسی

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 γ-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 γ-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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 339, Issues 1–3, 1 May 2009, Pages 60–67
نویسندگان
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