SERS Study of Rotational Isomerization of Cysteamine Induced by Magnetic Pulling Force
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- 作者：Takeyoshi Goto ; Hitoshi Watarai
- 刊名：Langmuir
- 出版年：2010
- 出版时间：April 6, 2010
- 年：2010
- 卷：26
- 期：7
- 页码：4848-4853
- 全文大小：841K
- 年卷期：v.26,no.7(April 6, 2010)
- ISSN：1520-5827
文摘
The effects of unidirectional pulling forces on covalently bridged cysteamine between superparamagnetic particles and Ag nanoparticles (NPs) were studied with SERS spectroscopy. With an increase in the pulling force from 0 to 100 pN per magnetic particle, the ν(C−S)Trans/ν(C−S)Gauche intensity ratio was increased from 0.6 to 1.08, the Raman frequency of ν(C−S)Trans was shifted from 716 to 719 cm−1, and the Raman bands associated with the amide groups were diminished. From these observations, it was concluded that the magnetic forces induced the extension of distance between the magnetic particle surface and the Ag NP surface and the rotational isomerization equilibrium of SC−CN was shifted from the gauche to the trans conformation with the longer molecular length.