Chemical interactions between silver nanoparticles and thiols: a comparison of mercaptohexanol against cysteine  

作　　者：TOH Her Shuang BATCHELOR-MCAULEY Christopher TSCHULIK Kristina COMPTON Richard G 

机构地区：[1]Department of Chemistry,Physical and Theoretical Chemistry Laboratory,University of Oxford,South Parks Road,Oxford OX1 3QZ,UK

出　　处：《Science China Chemistry》2014年第9期1199-1210,共12页中国科学（化学英文版）

基　　金：supported by the National Research Foundation Singapore under its National Research Foundation(NRF)Environmental and Water Technologies(EWT)PhD Scholarship Programme and administered by the Environment and Water Industry Programme Office(EWI);supported by a Marie Curie Intra European Fellowship;funding from the European Union’s Seventh Framework Programme(FP/2007-2013)/ERC Grant Agreement n.[320403]

摘　　要：The interaction between citrate capped silver nanoparticles and two different thiols, mercaptohexanol （MH） and cysteine, was investigated. The thiols interacted with silver nanoparticles in a significantly contrasting manner. With MH, a sparingly soluble silver（1） thiolate complex AgSRm （Rm = -（CH2）6OH） was formed on the silver nanoparticle surface. Cyclic voltammograms and UV-vis spectra were used to infer that the AgSRm complex on the nanoparticle surface undergoes a phase transition to give a mixture of AgSRm and Ag2S-like complexes. In contrast, when silver nanoparticles were exposed to cysteine, the citrate cap- ping agent on the silver nanoparticles was replaced by cysteine to give cysteine capped nanoparticles. As cysteine capped nanoparticles form, the electrochemical data displayed a decrease in oxidative peak charge but the UV-vis spectra showed a constant signal. Therefore, cysteine capped nanoparticles were suggested to have either inactivated the silver surface or else pro- moted detachment from the electrode surface.The interaction between citrate capped silver nanoparticles and two different thiols, mercaptohexanol(MH) and cysteine, was investigated. The thiols interacted with silver nanoparticles in a significantly contrasting manner. With MH, a sparingly soluble silver(I) thiolate complex AgSRm(Rm = –(CH2)6OH) was formed on the silver nanoparticle surface. Cyclic voltammograms and UV-vis spectra were used to infer that the AgSRm complex on the nanoparticle surface undergoes a phase transition to give a mixture of AgSRm and Ag2S-like complexes. In contrast, when silver nanoparticles were exposed to cysteine, the citrate capping agent on the silver nanoparticles was replaced by cysteine to give cysteine capped nanoparticles. As cysteine capped nanoparticles form, the electrochemical data displayed a decrease in oxidative peak charge but the UV-vis spectra showed a constant signal. Therefore, cysteine capped nanoparticles were suggested to have either inactivated the silver surface or else promoted detachment from the electrode surface.

关 键 词：SILVER nanoparticles interaction THIOL 

分 类 号：O614.122[理学—无机化学] Q517[理学—化学]