ELECTROCHEMICAL PREPARATION AND ANALYTICAL APPLICATIONS OF ULTRATHIN OVEROXIDIZED POLYPYRROLE FILMS
ELECTROCHEMICAL PREPARATION AND ANALYTICAL APPLICATIONS OF ULTRATHIN OVEROXIDIZED POLYPYRROLE FILMS
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DOI：
10.1021/ac00087a009
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发表时间：
1994-08-01
影响因子：
7.4
通讯作者：
BRAJTERTOTH, A
中科院分区：
文献类型：
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作者：
HSUEH, CC;BRAJTERTOTH, A
超薄过氧化聚吡咯薄膜已被涂覆在不同的衬底上（石墨和铂）。薄膜对阴离子表现出极好的选择性，对阳离子表现出极好的选择性。采用两种方法在电极上涂覆薄膜。在碳电极上，采用重复聚合和过氧化法制备无针孔薄膜。在Pt电极上，吸附的吡咯单层被过度氧化，形成对阴离子具有超选择性的超薄膜。吡咯的衍生物，吡咯-2-羧酸，也被用来形成薄膜。讨论并比较了这些薄膜的选择性。论证了超薄膜的实际应用。薄膜包覆的超微电极可抑制抗坏血酸电流，而多巴胺电流仅受轻微影响。
Ultrathin overoxidized polypyrrole films have been coated on different substrates (graphite and Pt). The thin films exhibit permselectivity against anions and excellent selectivity toward cations. Two approaches were used to coat the thin films on electrodes. On carbon electrodes, repeated polymerization and overoxidation was used to produce a pinhole-free thin film. On Pt electrodes, an adsorbed pyrrole monolayer was overoxidized to form an ultrathin film permselective against anions. A derivative of pyrrole, pyrrole-2-carboxylic acid, was also used to form thin films. The permselectivity of those thin films is discussed and compared. The practical use of the ultrathin films is demonstrated. The thin film coated ultramicroelectrodes are used to suppress the current of ascorbic acid while the current of dopamine is only slightly affected.