Probing the responsive behavior of polyelectrolyte brushes using electrochemical impedance spectroscopy

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	Probing the responsive behavior of polyelectrolyte brushes using electrochemical impedance spectroscopy
	Yu B(于波); Hu HY(胡海媛); Liu WM(刘维民); Zhou F(周峰)
刊名	Analytical Chemistry
	2007
卷号	79 期号:1 页码:176-182
ISSN号	0003-2700
通讯作者	Wilhelm T. S. Huck ; 刘维民
中文摘要	Cyclic voltammetry and impedance spectroscopy were employed to probe the responsive properties of polyelectrolyte brushes. Poly[(dimethylamino)ethyl methacrylate] (PDMAEMA) brushes over 100 nm thick on gold substrates were synthesized via surface-initiated atom-transfer radical polymerization and quaternized with methane iodide to obtain cationic brushes (Q-PDMAEMA). QPDMAEMA brushes respond to electrolytes by exhibiting swollen and collapsed states. Swollen brushes allow good permeability of electroactive probes, while collapsed states block electron transport. Electrolytes have different impacts on the electrochemical properties of Q-PDMAEMA. Some salts (NaNO3) cause brush collapse due to charge screening, while others such as those with more hydrophobic anions (ClO4-, PF6-, and Tf2N-) induce brush collapse because of solubility changes. The collapsed brushes exhibit intrinsically different resistance as probed with impedance. Charged screened brushes retain good permeability to electroactive probes. Strongly coordinating hydrophobic anions lead to insoluble brushes, resulting in a high resistance. These results show that electrochemical impedance spectroscopy is a powerful technique to probe the properties and structure of polyelectrolyte brushes.
学科主题	材料科学与物理化学
收录类别	SCI
资助信息	the NSFC (Grants 50421502;50405040);“973” project (Grant 2007CB607600);EPSRC (Grant GR/T11555/01)
语种	英语
WOS记录号	WOS:000243143300027
公开日期	2013-11-01
内容类型	期刊论文
源URL	[http://210.77.64.217/handle/362003/4112]
专题	兰州化学物理研究所_固体润滑国家重点实验室
通讯作者	Liu WM(刘维民)
推荐引用方式 GB/T 7714	Yu B,Hu HY,Liu WM,et al. Probing the responsive behavior of polyelectrolyte brushes using electrochemical impedance spectroscopy[J]. Analytical Chemistry,2007,79(1):176-182.
APA	于波,胡海媛,刘维民,&周峰.(2007).Probing the responsive behavior of polyelectrolyte brushes using electrochemical impedance spectroscopy.Analytical Chemistry,79(1),176-182.
MLA	于波,et al."Probing the responsive behavior of polyelectrolyte brushes using electrochemical impedance spectroscopy".Analytical Chemistry 79.1(2007):176-182.