Functionalization of glassy carbon with diazonium salts in ionic liquids
Functionalization of glassy carbon with diazonium salts in ionic liquids
复制标题
DOI：
10.1021/la703714a
复制
发表时间：
2008-06-17
期刊：
影响因子：
3.9
通讯作者：
Szunerits, Sabine
中科院分区：
文献类型：
--
作者：
Actis, Paolo;Caulliez, Guilain;Szunerits, Sabine
研究了离子液体中对溴苯（4-BBDT）和4-（4 ′-硝基苯偶氮）苯重氮四氟硼酸盐（4-NAB）对玻碳电极的化学功能化作用。该反应在室温下在空气中进行，没有任何外部电偏压，在疏水性（1-丁基-3-甲基咪唑六氟磷酸盐）或亲水性（1-丁基-3-甲基咪唑甲基硫酸盐）离子液体中。使用X-射线光电子能谱（XPS），拉曼光谱，和电化学测量所得的表面进行了表征。电化学还原的末端硝基基团允许的表面覆盖率和形成的胺封端的碳表面的测定。将结果与在1%十二烷基硫酸钠（SDS）与相同重氮盐存在下在水溶液中化学改性的玻璃碳进行比较。此外，结合电化学测量的拉曼光谱允许区分-NO2还原为-NH 2基团和-N=N-还原为-NH-NH-键。
The paper reports on the chemical functionalization of glassy carbon electrodes with 4-bromobenzene (4-BBDT) and 4-(4'-nitrophenylazo)benzene diazonium tetrafluoroborate (4-NAB) salts in ionic liquids. The reaction was carried out at room temperature in air without any external electrical bias in either hydrophobic (1-butyl-3-methylimidazolium hexafluorophosphate) or hydrophilic (1-butyl-3-methylimidazolium methyl sulfate) ionic liquids. The resulting surfaces were characterized using X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and electrochemical measurements. Electrochemical reduction of the terminal nitro groups allowed the determination of surface coverage and formation of an amine-terminated carbon surfaces. The results were compared to glassy carbon chemically modified in an aqueous solution in the presence of 1% sodium dodecyl sulfate (SDS) with the same diazonium salt. Furthermore, Raman spectroscopy coupled with electrochemical measurements allowed to distinguish between the reduction of -NO2 to -NH2 group and the -N=N- to -NH-NH- bond.