Partial charge transfer of poly(vinylferrocene)-coated latex particles adsorbed on pyrolytic graphite electrode
Partial charge transfer of poly(vinylferrocene)-coated latex particles adsorbed on pyrolytic graphite electrode
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DOI：
10.1016/s1388-2481(03)00112-7
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发表时间：
2003-06
影响因子：
5.4
通讯作者：
Cuiling Xu;Jingyuan Chen;K. Aoki
中科院分区：
文献类型：
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作者：
Cuiling Xu;Jingyuan Chen;K. Aoki
作为大颗粒电极反应的模型，通过与苯磺酸盐和苯乙烯的共聚反应，合成了固定在聚苯乙烯乳胶粒上的乙烯基二茂铁。它们几乎是单分散的球体，直径为1.2μm，每个球体含有3.1×107个二茂铁单元。吸附在热解石墨电极(PGE)上的颗粒在NaBF4水溶液中对二茂铁单元具有氧化还原活性。没有磺酸基的粒子没有电活性，因此电活性需要二茂铁单元周围的离子微环境。从二茂铁单元的法拉第电荷估算，每个颗粒的电活性中心约占整个固定化二茂铁单元的8%。提出了部分电荷转移的模型，即粒子被吸附在PGE粗糙表面的空穴中。
As a model of an electrode reaction of a big particle, vinylferrocene immobilized on polystyrene latex particles were synthesized by copolymerization with styrene sulfonate and styrene. They had almost mono-dispersed spheres with 1.2 μm in diameter, and each had 3.1×107ferrocene units. The particles adsorbed on pyrolytic graphite electrode (PGE) showed the redox activity for the ferrocene unit in NaBF4aqueous solution. Particles without the sulfonate group had no electroactivity, and hence the electroactivity needs ionic micro-environment around the ferrocene unit. From the faradaic charge of the ferrocene unit, the electroactive sites per particle were estimated to be about 8% of the whole immobilized ferrocene units. A model of this partial charge transfer was proposed, in which the particles are adsorbed in hollows of the rough surface of the PGE.