| Probing the responsive behavior of polyelectrolyte brushes using electrochemical impedance spectroscopy | |
| Department | 固体润滑国家重点实验室 |
Zhou F(周峰) ; Hu HY(胡海媛); Yu B(于波); Vicky L. Osborne; Wilhelm T. S. Huck; Liu WM(刘维民)
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| 2007 | |
| Source Publication | Analytical Chemistry
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| ISSN | 0003-2700 |
| Volume | 79Issue:1Pages:176-182 |
| Abstract | 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. |
| Subject Area | 材料科学与物理化学 |
| Funding Organization | the NSFC (Grants 50421502;50405040);“973” project (Grant 2007CB607600);EPSRC (Grant GR/T11555/01) |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 材料表面与界面行为研究组 ; 空间润滑材料组 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/4112 |
| Collection | 固体润滑国家重点实验室（LSL） |
| Corresponding Author | Wilhelm T. S. Huck; Liu WM(刘维民) |
| Recommended Citation GB/T 7714 | Zhou F,Hu HY,Yu B,et al. Probing the responsive behavior of polyelectrolyte brushes using electrochemical impedance spectroscopy[J]. Analytical Chemistry,2007,79(1):176-182. |
| APA | 周峰,胡海媛,于波,Vicky L. Osborne,Wilhelm T. S. Huck,&刘维民.(2007).Probing the responsive behavior of polyelectrolyte brushes using electrochemical impedance spectroscopy.Analytical Chemistry,79(1),176-182. |
| MLA | 周峰,et al."Probing the responsive behavior of polyelectrolyte brushes using electrochemical impedance spectroscopy".Analytical Chemistry 79.1(2007):176-182. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| 2007176-182.pdf（357KB） | 开放获取 | CC BY-NC-SA | View Application Full Text | |||
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