Micropatterned Polyvinyl Butyral Membrane for Acid−Base Diodes

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• 作者：Lszl Roszol ; Thuy Lawson ; Viktria Koncz ; Zoltn Noszticzius ; Maria Wittmann ; Tams Sarkadi ; Pl Koppa
• 刊名：Journal of Physical Chemistry B
• 出版年：2010
• 出版时间：November 4, 2010
• 年：2010
• 卷：114
• 期：43
• 页码：13718-13725
• 全文大小：271K
• 年卷期：v.114,no.43(November 4, 2010)
• ISSN：1520-5207

文摘

Until now, polyvinyl alcohol (PVA) gel cylinders have been used in electrolyte diodes as a connecting element between the acidic and alkaline reservoirs. In this paper, a new connecting element is reported: a breath figure templated polyvinyl butyral (PVB) membrane prepared with dip-coating from a dichloromethane solution of the polymer in a humid atmosphere. The procedure gives a 1.5−2 μm thick membrane with a hexagonal pattern, the average characteristic length of which is 1 μm. After an acidic etching, it was found to be a good connecting element. The voltage−current characteristics and dynamic properties of PVA and PVB were measured and compared. The PVB membrane has a faster response to voltage changes than the PVA gel, but in both cases, there was a slow drift in the current that prevented it from reaching a steady state. Reproducible characteristics can be obtained, however, after the current reaches a well-defined quasi-steady state.