Spectroscopic identification of S-Au interaction in cysteine capped gold nanoparticles
Spectroscopic identification of S-Au interaction in cysteine capped gold nanoparticles
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DOI：
10.1016/j.saa.2005.04.048
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发表时间：
2006-01-01
影响因子：
4.4
通讯作者：
Kim, HY
中科院分区：
文献类型：
--
作者：
Aryal, S;Remant, BKC;Kim, HY
本研究利用硼氢化物还原法合成了平均粒径为12 nm的半胱氨酸修饰的金纳米粒子，并利用光谱法研究了S-Au相互作用。我们采用紫外-可见光谱、拉曼光谱、核磁共振光谱和红外光谱研究了巯基与金纳米粒子在水溶液中的相互作用。紫外-可见光谱中金等离子体共振的位移表明半胱氨酸对金纳米粒子的稳定作用。红外和拉曼光谱中S-H伸缩的消失以及靠近金属中心的质子的NMR信号的移动支持了半胱氨酸封端的金纳米颗粒中S-Au相互作用的存在。TEM图像显示与游离胶体金纳米颗粒相比，半胱氨酸封端的金纳米颗粒为不同的球形实体。(c)2005 Elsevier B. V.保留所有权利。
This study deals with the synthesis of cysteine capped gold nanoparticles with an average size of 12 nm by borohydride reduction and spectroscopic identification of S-Au interaction. We have studied the interaction of thiol with gold nanoparticles in aqueous medium by employing UV-vis, Raman, NMR, and FT-IR spectroscopy. The shifting of gold plasmon resonance in the UV-vis spectra shows the stabilization of gold nanoparticles by cysteine. The disappearance of S-H stretching in both the IR and Raman spectra and the shifting of the NMR signals of the protons in close proximity to the metal center supported the existence of the S-Au interaction in cysteine capped gold nanoparticles. The TEM images shows cysteine capped gold nanoparticles as distinct and spherical entities as compared to free colloidal gold nanoparticles. (c) 2005 Elsevier B.V. All rights reserved.