In situ electropolymerised silica-polyaniline core-shell structures: Electrode modification and enzyme biosensor enhancement
In situ electropolymerised silica-polyaniline core-shell structures: Electrode modification and enzyme biosensor enhancement
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DOI：
10.1016/j.electacta.2006.07.051
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发表时间：
2007-01-01
影响因子：
6.6
通讯作者：
Smyth, Malcolm R.
中科院分区：
文献类型：
--
作者：
Luo, Xiliang;Killard, Anthony J.;Smyth, Malcolm R.
微结构和纳米结构的电极界面具有表现出改进的性能特征的潜力。在这里，我们说明了电聚合聚苯胺膜与二氧化硅微粒在玻璃碳电极上的相互作用。结果发现，聚苯胺优先生长周围的二氧化硅颗粒，而不是在下面的电极表面。这被发现是由于苯胺单体吸附到二氧化硅表面上，然后原位电聚合。聚苯胺层的厚度可以通过调整聚合时间从几个到几十个nanometrs.In结合固定化的酶，辣根过氧化物酶（HRP），过氧化氢的电催化还原被发现在某些条件下，在没有二氧化硅颗粒的情况下生长的聚合物膜被增强。据信，这可能是由于二氧化硅-PANI核-壳粒子的特殊结构。涂有聚苯胺纳米膜的二氧化硅颗粒似乎更有效地吸附HRP，同时也增加了活性电极表面积。(c)2006爱思唯尔有限公司保留所有权利。
Micro- and nanostructured electrode interfaces have the potential to exhibit improved performance characteristics. Here, we illustrate the interaction of an electropolymerised polyaniline film with silica microparticles on glassy carbon electrodes. It was found that the polyaniline grew preferentially around the silica particles rather than on the underlying electrode surface. This was found to be due to the adsorption of aniline monomers onto the silica surface, followed by in situ electropolymerisation. The thickness of the PANI layer could be controlled through the adjustment of polymerisation time from several to many tens of nanometres.In conjunction with immobilisation of the enzyme, horseradish peroxidase (HRP), the electrocatalytic reduction of hydrogen peroxide was found to be enhanced under certain conditions over polymer films grown in the absence of silica particles. It is believed that this may be due to the special structure of the silica-PANI core-shell particles. Silica particles coated with a nanofilm of PANI appear to adsorb HRP more effectively, while also increasing the active electrode surface area. (c) 2006 Elsevier Ltd. All rights reserved.