Surface Characterization of Glassy Carbon Electrodes Anodized in 1-Alkanols by Their Wettability and Capacitance

概要

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The surface conditions of glassy carbon (GC) electrodes anodized in n-C_nH_<2n+1>OH (2=2,4,6,8 : electrodes 1-4), HO(CH_2)_nOH (n=2-5 : electrodes 5-8), and HO(CH_2CH_2O)_2CH_2CH_2OR (R=H, Me : electrodes 9 and 10) were explored by measuring the wettability and capacitance as well as the voltammetric response to Fe(CN)^<3->_6;wetting properties were evaluated by the contact angle formed by a drop of water; the ratio between the values of capacitance obtained before and after the anodic modification was used instead of the capacitance itself. The data have revealed that LiClO_4 is recommended rather than conc. H_2SO_4 as a supporting electrolyte to fix 1-alkanol molecules more effectively to GC electrode surfaces in the anodic modification. The surface conditions of electrodes 1-10 have reflected the indentities of the modifer remarkably : electrodes 1-4 have surfaces with hydrophobicity and thickness correlated to the length of carbon chains of the modifiers; on the other hand, the surfaces of electrodes 5-10 are hydrophilic, which seemed to allow each of the modified electrodes, except for electrode 8,to have a double layer with a thickness similar to a bare GC electrode. The suppression in the electrode reaction of Fe(CN)^<3->_6 was stronger at electrodes 6 and 8 than at electodes 5 and 7,which can be explained by the invocation of an"odd-even" effect.
公益社団法人日本薬学会の論文
1996-12-15