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Preparation and Property of a Negatively Charged Colloidal Nano-silver
Si Minzhena,Wu Rongguob,Zhang Pengxiangc
Author NameAffiliation
Si Minzhena Department ofPhysics, Chuxiong Teacher′s College, Chuxiong 675000 
Wu Rongguob Chuxiong Environmental Monitoring Station, Chuxiong 675000 
Zhang Pengxiangc 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,武荣国,张鹏翔
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
分类号: