物理化学学报 >> 2004, Vol. 20 >> Issue (06): 647-650.doi: 10.3866/PKU.WHXB20040619

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PyDDP修饰的金纳米颗粒的制备及其吸收红移机制

高丽珍;张兴堂;戴树玺;李蕴才;黄亚彬;杜祖亮;李铁津   

  1. 河南省特种功能材料重点实验室,河南大学,开封　475001;吉林大学光化学实验室,长春　130021
  • 收稿日期:2003-11-21 修回日期:2004-02-11 发布日期:2004-06-15
  • 通讯作者: 杜祖亮 E-mail:zld@henu.edu.cn

Preparation of PyDDP-modified Gold Nanoparticles and Mechanism for Red-shift in the Surface Plasma Resonance Absorption

Gao Li-Zhen;Zhang Xing-Tang;Dai Shu-Xi;Li Yun-Cai;Huang Ya-Bin;Du Zu-Liang;Li Tie-Jin   

  1. Key Laboratory of Special Functional Materials of Henan Province, Henan University, Kaifeng　475001; Photochemistry Laboratory of Jilin University, Changchun　130021
  • Received:2003-11-21 Revised:2004-02-11 Published:2004-06-15
  • Contact: Du Zu-Liang E-mail:zld@henu.edu.cn

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摘要： 用柠檬酸三钠还原四氯化金制备了金纳米颗粒,并用双十八烷氧基二硫代磷酸吡啶盐（PyDDP）对其进行修饰. 红外吸收光谱表明PyDDP与金颗粒表面以共价键方式结合；透射电子显微镜（TEM）的结果表明, 所得到的PyDDP修饰的纳米金颗粒尺寸与修饰前基本相同; PyDDP修饰的金纳米粒子表面等离子吸收发生了较大幅度的红移.利用偶极子模型结合配位理论解释了PyDDP修饰的金纳米颗粒发生红移的机制.

关键词: 红移, 表面等离子体振荡, 偶极子, 双十八烷氧基二硫代磷酸吡啶盐（PyDDP）

Abstract: Gold nanoparticles were reduced by sodium from HAuCl4 citrate and then modified by PyDDP（O,O’-Dioctadecane dithiophosphate）. IR spectra indicated that PyDDP covalent bond with the surface of the gold nanoparticle. TEM results showed that nanoparticles modified by PyDDP had a similar size with that of the original nanoparticles. At the same time it had been found that the surface plasma resonance (SPR) absorbance of the PyDDP-modified gold nanoparticles had a large red shift. Furthermore, the Jellium model was used to analyze the characteristics of SPR；the dipole model and the IR spectrum were used to form a new dipole model. It can be used to explain the mechanism of the red shift.

Key words: Red shift, Surface plasma resonance, Dipole,　O,O’-Dioctadecane dithiophosphate (PyDDP)