Covalent modification of carbon surfaces by aryl radicals generated from the electrochemical reduction of diazonium salts
Covalent modification of carbon surfaces by aryl radicals generated from the electrochemical reduction of diazonium salts
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DOI：
10.1021/ja963354s
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发表时间：
1997-01-08
影响因子：
15
通讯作者：
Saveant, JM
中科院分区：
文献类型：
--
作者：
Allongue, P;Delamar, M;Saveant, JM
在碳电极（玻璃碳、高取向热解石墨）上的各种芳族重氮盐的电化学还原导致相应芳族基团的共价连接。这样沉积在玻璃碳表面上的膜需要机械磨损才能去除。循环伏安法，X射线光电子能谱，偏振调制红外反射吸收光谱，俄歇光谱，卢瑟福背散射光谱允许的覆盖层的表征和估计的表面覆盖。后者可以通过重氮浓度和电解时间来控制。根据循环伏安法和制备电解法获得的动力学数据，讨论了衍生化反应的机理。这种多功能的表面改性方法可以在碳-环氧复合材料领域中找到应用，这可以通过接枝的对氨基苯基与环氧氯丙烷的成功结合来证明。
Electrochemical reduction of a wide variety of aromatic diazonium salts on carbon electrodes (glassy carbon, highly oriented pyrolytic graphite) leads to the covalent attachment of the corresponding aromatic radicals. The films thus deposited on glassy carbon surfaces require mechanical abrasion to be removed. Cyclic voltammetry, X-ray photoelectron spectroscopy, polarization modulation IR reflection absorption spectroscopy, Auger spectroscopy, and Rutherford backscattering spectroscopy allow the characterization of the overlayer and an estimate of the surface coverage. The latter can be controlled through diazonium concentration and electrolysis duration. The mechanism of derivatization is discussed on the basis of the kinetic data obtained from cyclic voltammetry and preparative electrolysis. This versatile method of surface modification may find applications in the field of carbon-epoxy composites as attested by the successful binding of grafted p-aminophenyl groups with epichlorhydrin.