Impact of magnetic field on molecular alignment and electrical conductivity in phthalocyanine nanowires

Seiichi Takami, Seiichi Furumi, Yasuhiro Shirai, Yoshio Sakka, Yutaka Wakayama

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We demonstrate the effective use of a magnetic field to improve molecular alignment, and the resulting enhancement of the electrical conductivity of organic molecular nanowires. The structures of phthalocyanine nanowires, which are produced in porous alumina templates, are characterized by X-ray diffraction. Careful analyses reveal that the crystal morphologies of the phthalocyanine nanowires, e.g., domain size, columnar alignment and face-to-face spacing, are improved by using a 12 T magnetic field. This is because of the anisotropic magnetic susceptibility of the π-conjugated phthalocyanine macrocycle. Electrical measurements of individual nanowires performed with a multi-probe scanning electron microscope show that such highly ordered molecular packing results in a seventeen-fold increase in conductivity.

Original languageEnglish
Pages (from-to)8629-8633
Number of pages5
JournalJournal of Materials Chemistry
Volume22
Issue number17
DOIs
Publication statusPublished - 2012 May 7

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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