Dipole assisted photogated switch in spiropyran grafted polyaniline nanowires

Yosef Bardavid, Ilya Goykhman, Daijiro Nozaki, Gianaurelio Cuniberti, Shlomo Yitzchaik*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


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.

Original languageAmerican English
Pages (from-to)3123-3128
Number of pages6
JournalJournal of Physical Chemistry C
Issue number7
StatePublished - 24 Feb 2011


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