Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 333, Issue 2, Pages 725-733Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2009.02.003
Keywords
Layer-by-layer assembly; Electrochemical impedance spectroscopy; Film resistance; Charge-transfer resistance; Buildup mechanism
Categories
Funding
- National Natural Science Foundation of China [50772125]
- Science and Technology Commission of Shanghai Municipality [08JC1420700]
- National High Technology Research and Development Program (863 Program) of China
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The layer-by-layer (LbL) assembly as a simple and effective method has been extensively used to prepare polyelectrolyte films but the buildup mechanism is expected to be further clarified. In this work, the structure and formation mechanism of LbL-assembled heparin/chitosan multilayer composite films were characterized by electrochemical system, scanning electron microscope and atom force microscope. The results revealed that the film grew linearly in the first 10 bilayers based on measured linear increase of film resistance with number of layers, while the film grew exponentially in the later 10 bilayers based on measured nonlinear increase of film resistance. The charge-transfer resistance increased in an oscillatory way or a linear way at different growing stages, which was discussed with their formation mechanism and the interfacial structure on electrode. A buildup mode of the LbL film was suggested based on the structural and electrochemical characters. (C) 2009 Elsevier Inc. All rights reserved.
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