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Preparation and Property of a Negatively Charged Colloidal Nano-silver
Si Minzhena1, Wu Rongguob2, Zhang Pengxiangc3
1.Department ofPhysics, Chuxiong Teacher′s College, Chuxiong 675000;2.Chuxiong Environmental Monitoring Station, Chuxiong 675000;3.Department of Material Science and Engineering, Kunming University of Science and Technology, Kunming 651000
Abstract:
Negatively charged colloidal nano-silver particles were successfully prepared by the colloidal chemical method. A 1.7% solution of silver nitrate (2 mL) was diluted with deionized water to 100 mL. A 1% solution of tannic acid (1 mL) was added dropwise to the solution stirring, then a 1% solution of potassium carbonate anhydrous (3~4 drops) was added to the mixed solution. Finally ,a red-brown silver sol was obtainned,which was stable at room temperature for seven months. It has been testified that the silver sol is a negatively charged colloid by experiment of electrophoresis. The sizes of particles were determined by Hitachi H-800 transmisson electron microscope. Absorption spectroscopy and SERS were used to determine of the main properties. Absorption spectroscopy was obtained with UV-1201. Raman spectra were recorded with RENISHAW MIK 1000 Raman micro-spectroscopy. The 514.5 nm line of an argon ion laser with about 3 mW was used. It has been found that the mean diameter of the particles was 11 nm; it had absorption maximum at 422 nm; Strong SERS spectra were observed when cationic molecules of fuchsin basic and methylene blue and neutral molecule of 1,10-phenanthroline were adsorbed on it respectively, but no SERS for the anionic molecule of Indolebutyric acid.
Key words:  Negatively colloidal nano- silver particles, TEM, Absorption spectroscopy,SERS
FundProject:
负电性纳米银的制备及性质研究
司民真1, 武荣国2, 张鹏翔3
1.楚雄师专物理系, 楚雄 675000;2.楚雄市环境监测站, 楚雄 675000;3.昆明理工大学材料与冶金工程学院, 昆明 651000
摘要:
制备了一种表面带负电的胶态纳米银,用透射电镜、吸收光谱、SERS谱对该纳米银进行了研究.发现纳米银的粒径分布均匀,平均粒径为11nm,吸收峰为422nm,常温下放置7个月仍具有较强的SERS活性.当阴离子型分子吲哚丁酸、阳离子型分子碱性品红、亚甲兰及中性分子邻菲罗邻分别吸附在其上时,观察到阳离子型分子碱性品红和亚甲兰及中性分子邻菲罗邻的SERS谱,而阴离子型分子吲哚丁酸则无SERS谱出现.
关键词:  负电性胶态纳米银  透射电镜  吸收谱  SERS
DOI:10.1088/1674-0068/14/4/465-468
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