Dipole Assisted Photogated Switch in Spiropyran Grafted Polyaniline Nanowires

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• 作者：Yosef Bardavid ; Ilya Goykhman ; Daijiro Nozaki ; Gianaurelio Cuniberti ; Shlomo Yitzchaik
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：February 24, 2011
• 年：2011
• 卷：115
• 期：7
• 页码：3123-3128
• 全文大小：899K
• 年卷期：v.115,no.7(February 24, 2011)
• ISSN：1932-7455

文摘

In this work we show dipole-assisted photogated switching by covalent grafting of photoactive molecules to conducting polymers. Photochromic spiropyran molecules were covalently attached to polyaniline (PANI) nanowires via N-alkylation reaction to the quinoic part of PANI. Upon irradiation with ultraviolet light spiropyran transformed to a large dipole containing molecule, merocyanine form. We show that this transformation leads to a substantial (ca. 2 orders of magnitude) increase in conductance of the photochromic PANI nanowires, which were evident by an increase in field-effect mobility and calculated band gap narrowing of the system. Finally, this transformation was found to be fully reversible with no significant photofatigue.