Ultrathin polypeptide multilayer films for the fabrication of model liquid/liquid electrochemical interfaces

被引:69
作者
Cheng, YF [1 ]
Corn, RM [1 ]
机构
[1] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 41期
关键词
D O I
10.1021/jp9920693
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ultrathin (<20 nm) polypeptide multilayer films are assembled by the electrostatic adsorption of alternating monolayers of poly(L-lysine) and poly(L-glutamic acid) onto carboxylic acid terminated alkanethiol-modified gold surfaces. These polypeptide multilayer films are hydrophilic, can bind electroactive anions such as ferri/ferrocyanide, and are stable when immersed in organic solvents such as 1,2-dichloroethane (1,2-DCE). A combination of ex situ polarization-modulation Fourier transform infrared reflection-absorption spectroscopy (PM-FTIRRAS) and surface plasmon resonance (SPR) measurements is used to characterize the film deposition and the incorporation of D2O and electroactive ions. Electrochemical cycling of the polypeptide films in 1,2-DCE is used to reversibly oxidize the ferrocyanide ions in the film, and in situ PM-FTIRRAS measurements demonstrate that more than 95% of the ferrocyanide ions can be converted to ferricyanide without loss to the organic phase. These ultrathin films will be used to study both ion and electron transport across the film/1,2-DCE interface.
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页码:8726 / 8731
页数:6
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