کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1255428 | 971423 | 2009 | 5 صفحه PDF | دانلود رایگان |
Highly active, stable and affordable surface enhanced Raman scattering (SERS) substrates were obtained by electrolyzing a mixture of AgNO3 (4 × 10−4 mol/L) and Na3C6H5O7·H2O (6 × 10−5 mol/L) for 1, 2, 3 and 4 h at 7 V. With crystal violet (CV) as a test molecule, a portable Raman spectrometer with 785 nm laser excitation was employed to carry out the SERS detection. Colloidal Ag nanoparticles prepared by electrolyzing for 3 h with the particle size of (65 ± 17) nm is a perfect SERS substrate for the ultratrace detection of CV, which displayed an enhancement factor of ca. 1.3 × 108 and the detection limit of CV is down to ca. 10−15 mol/L (ca. 10−4 ppb) with 10−1 mol/L KBr as aggregating agent. Thus, this SERS substrate will provide a hopeful foreground in ultratrace detection. Meanwhile, it will provide a possibility to bring Raman analysis out of the laboratory to process in situ, real-time detection and identification.
Journal: Chinese Chemical Letters - Volume 20, Issue 6, June 2009, Pages 711–715