Photoregulation of mass transport through a photoresponsive azobenzene-modified nanoporous membrane
Photoregulation of mass transport through a photoresponsive azobenzene-modified nanoporous membrane
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DOI：
10.1021/nl0350783
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发表时间：
2004-04-01
期刊：
影响因子：
10.8
通讯作者：
Brinker, CJ
中科院分区：
文献类型：
--
作者：
Liu, NG;Dunphy, DR;Brinker, CJ
由偶氮苯配体修饰的单一尺寸孔隙组成的光响应纳米多孔膜，通过蒸发诱导自组装过程在ITO工作电极上制备。利用计时电流法测定，它们表现出两种基于二茂铁的分子探针通过膜到电极表面的尺寸选择性光调控质量传输。所测量的氧化电流随着紫外光和可见光的交替照射而增加和减少，这与偶氮苯配体的光异构化状态密切相关。这表明偶氮苯配体的光学可切换构象（反式或顺式）控制着有效孔径，并相应地控制着纳米尺度上的传输行为。
Photoresponsive nanoporous membranes, composed of monosized pores modified with azobenzene ligands, were prepared on an ITO working electrode using an evaporation-induced self-assembly procedure. They exhibited the size-selective photoregulated mass transport of two ferrocene-based molecular probes through the membrane to the electrode surface as determined using a chronoamperometry technique. The measured oxidative current increased and decreased in response to alternating UV and visible light exposure correlating strongly with the photoisomerization state of the azobenzene ligands. This indicates that the optically switchable conformation (trans or cis) of azobenzene ligands controls the effective pore size and, correspondingly, transport behavior on the nanoscale.