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Citation: Gao Li-Zhen, Zhang Xing-Tang, Dai Shu-Xi, Li Yun-Cai, Huang Ya-Bin, Du Zu-Liang, Li Tie-Jin. Preparation of PyDDP-modified ld Nanoparticles and Mechanism for Red-shift in the Surface Plasma Resonance Absorption[J]. Acta Physico-Chimica Sinica, ;2004, 20(06): 647-650. doi: 10.3866/PKU.WHXB20040619 shu

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

1.
Key Laboratory of Special Functional Materials of Henan Province, Henan University, Kaifeng　475001; Photochemistry Laboratory of Jilin University, Changchun　130021

Received Date: 21 November 2003
Available Online: 15 June 2004

ld 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 ld 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 ld 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.
- Red shift;Surface plasma resonance;Dipole,　O,O’-Dioctadecane dithiophosphate (PyDDP)
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