| 光谱学与光谱分析 |
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| AgBr Colloids Prepared by Electrolysis and Their SERS Activity Research |
| SI Min-zhen1,FANG Yan2,DONG Gang1,ZHANG Peng-xiang3 |
1. Department of Physics and Electronic Science, Chuxiong Teacher’s College, Chuxiong 675000, China
2. Beijing Key Lab of Nano-photonics and Nano-Structure(NPNS), Department of Physics, Capital Normal University, Beijing100037, China
3. IAMPE Kunming University of Science and Technology, Kunming 651000, China |
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Abstract Ivory-white AgBr colloids were prepared by means of electrolysis. Two silver rods 1.0 cm in diameter and 10.0 cm long were respectively used as the negative and positive electrodes，the aqueous solution of hexadecyl trimethyl ammonium bromide was used as the electrolyte, and a 7 V direct current was applied on the silver rods for three hours. The obtained AgBr colloids were characterized by UV-Vis spectroscopy, transmission electron microscopy, and SERS using a 514.5 nm laser line on Renishaw 2000 Raman spectrometer. These particles are about nanometer size and their shapes are as spherical or elliptic, with a slight degree of particle aggregation. The UV-Vis spectra exhibit a large plasmon resonance band at about 292.5 nm, similar to that reported in the literature. The AgBr colloids were very stable at room temperature for months. In order to test if these AgBr colloids can be used for SERS research, methyl orange, Sudan red and pyridine were used. It was found that AgBr colloids have SERS activity to these three molicules. For methyl orange, the intense Raman peaks are at 1 123, 1 146, 1 392, 1 448 and 1 594 cm-1；for Sudan red, the intense Raman peaks are at 1 141, 1 179, 1 433 and 1 590 cm-1；and for pyridine, the intense Raman peaks are at 1 003, 1 034 and 1 121 cm-1. It is noticeable that SERS of methyl orange was observed on AgBr colloids, but not on the gray and yellow silver colloids prepared by traditional means. The possible reason was explained. One major advantage of this means is the absence of the spectral interference such as citrate, BH-4 arising from reaction products of the colloids formation process. On AgBr colloids, one can get some molecular SERS impossible to get on the gray and yellow silver colloids.
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Received: 2006-07-10
Accepted: 2006-11-20
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Corresponding Authors:
SI Min-zhen
E-mail: siminzhen@cxtc.edu.cn
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