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| - Covalent Modification of a Glassy Carbon Surface by4-Aminobenzoic Acid and Its Application in Fabrication ofa Polyoxometalates-Consisting Monolayer and MultilayerFilms
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| - 4-Aminobenzoic acid (4-ABA) was covalently grafted on a glassy carbon electrode (GCE) by amine cationradical formation in the electrooxidation process of the amino-containing compound. X-ray photoelectronspectroscopy measurement proves the presence of 4-carboxylphenylamine monolayer on the GCE. Theredox responses of various electroactive probes were investigated on the 4-ABA-modified GCE. Electrontransfer to Fe(CN)63- in solutions of various pHs was studied by both cyclic voltammetry and electrochemicalimpedance analysis on the modified electrode. Changes in the solution pH value result in the variationof the terminal group charge state, based on which surface pKa values are estimated. The 4-ABA-modifiedGCE was used as a suitable charged substrate to fabricate polyoxometalates-consisting (POM-consisting)monolayer and multilayer films through layer-by-layer assembly based on electrostatic attraction. Cyclicvoltammetry shows the uniform growth of these three-dimensional multilayer films. Taking K10H3[Pr(SiMo7W4O39)2]·xH2O (abbreviated as Pr(SiMo7W4)2), for example, the preparation and electrochemicalbehavior of its monolayer and multilayer film had been investigated in detail. This modification strategyis proven to be a general one suitable for anchoring many kinds of POMs on the 4-ABA-modified GCE.
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