Self-assembly of L-cysteine-copper(II)/copper(I) multilayer thin films on gold.
Self-assembled multilayer thin films have been prepared on Au substrate by alternate surface derivatization with L-cysteine hydrochloride and cupric perchlorate. The layer-by-layer structure at each step of multilayer formation was investigated by X-ray photoelectron spectroscopy. The measurements indicate that there are two structure modes in the multilayers. One is that Cu(2+) sandwiches between two amino acid groups. The other one is that Cu(+) is bonded through disulfide and thiolate. This process is also confirmed by cyclic voltammetry of Cu ion at different self-assembled multilayers. Steps further on will lead to repeated multilayer films.
Zhang
Wen-Wei
WW
Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, Nanjing University, No. 22 Hankou Road, Nanjing 210093, People's Republic of China.
Lu
Chang-Sheng
CS
Zou
Yang
Y
Xie
Jing-Li
JL
Ren
Xiao-Ming
XM
Zhu
Hui-Zhen
HZ
Meng
Qing-Jin
QJ