金纳米粒子自球形向棒状的转变和生长的光化学法研究  

Study on the Transformation from Spherical to Rodlike Gold Nano- particle and Its Self-organization Growth by Photochemical Method

作　　者：杨生春[1] 董守安[1] 唐春[1] 李品将[1] 

机构地区：[1]昆明贵金属研究所,昆明650221

出　　处：《化学学报》2005年第10期873-879,i001,共8页Acta Chimica Sinica

基　　金：云南省自然科学基金重点(No.2000E0008Z)资助项目.

摘　　要：在含有HAuCl4和十六烷基三甲基氯化铵(CTMAC)的DMF-H2O-丙酮介质中,以CTMAC形成的胶束为模板,丙酮为光敏剂,光化学还原法制备了不同长径比的棒状金纳米粒子.通过改变DMF∶H2O(V/V)的比例来改变溶液的极性,增加胶束聚集数,实现了自球形胶束向棒状的转变,从而得到以金纳米棒占优势的金胶体溶液.研究了HAuCl4和CTMAC的浓度以及照射时间对金纳米棒生长的影响,在最佳实验条件下,获得了直径在20～22nm,长为0.5～3μm的金纳米棒,讨论了光化学反应和金纳米粒子在形成的棒状胶束中的自组装生长机理.Gold nanorods with different aspect ratios were synthesized by the photochemical reduction method in H2O-DMF-acetone medium containing HAuCl4 and cetyltrimethyl ammonium chloride (CTMAC), by means of forming CTMAC micelle as template and acetone as photosensitizer. The transformation from spherical to rodlike micelle was realized by changing the ratio of DMF : H2O (V/V) to turn the polarity of the medium and increasing micelle aggregation number, as a result, a colloidal solution predominated by rodlike gold nanoparticles was obtained. The influence of the concentration of HAuCl4 and CTMAC as well as irradiation time on the growth of nanoparticle self-organization was investigated. Under optimal conditions, gold nanorods with a diameter of 20 to 22 nm and a length of 0.5 to 3 mu m were synthesized. The mechanisms of the photochemical reaction and gold nanoparticle self-organization in rodshaped micelle were discussed in detail.

关 键 词：金纳米粒子 棒状 光化学法 球形 十六烷基三甲基氯化铵 最佳实验条件 化学还原法 胶束聚集数 CTMAC 光化学反应 纳米棒 胶体溶液 照射时间 生长机理 光敏剂 长径比 H2O DMF 自组装 丙酮 C形 

分 类 号：TB383[一般工业技术—材料科学与工程]