阳离子表面活性剂对液相银纳米微粒吸收光谱的影响  

Effect of Cation Surfactants on Absorption Spectra of Silver Nanoparticle in Liquid Phase

作　　者：袁伟恩[1] 蒋治良[1] 潘宏程[1] 康彩艳[1] 

机构地区：[1]广西师范大学资源与环境学系,广西桂林541004

出　　处：《光谱学与光谱分析》2005年第6期920-922,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(20365001);广西自然科学基金资助项目

摘　　要：粒径为2 0nm的黄色银纳米微粒在4 0 0nm处有一吸收峰,当加入阳离子表面活性剂(CS)的浓度较低时,A4 0 0nm 减小,波长大于4 0 0nm以上的吸收增大且体系的吸收峰发生红;当CS浓度较高时,波长大于4 0 0nm以上的吸收减小,而在4 0 0nm处的吸收增大,体系的吸收峰发生蓝移。研究表明这是由于CS与带负电荷的银纳米存在较强的疏水和静电作用而导致银纳米微粒形貌的改变所致。Yellow Ag nanoparticles, with diameter of 20 nm, exhibit a resonance absorption peak at 400 rim. After adding some cation surfactants (CS), the absorbance at 400 nm becomes weak, (namely, there exists hypochromic effect), but the absorbance at wavelengths longer than 400 nm is enhanced and shows a red shift. When adding concentration of CS, the absorbance at wavelengths longer than 400 run becomes weak again, the peak at 400 rim is enhanced (namely, there exists hyperchromic effect) and the absorption peaks show a blue shift. The results showed that this is caused by the strong hydrophobic force and electrostatic force between the CS and silver nanoparticls, which results in a change in the silver nanoparticle shape.

关 键 词：银纳米微粒 表面活性剂 减色 增色作用 

分 类 号：O657.6[理学—分析化学]