Surface pressure induced charge transfer between fullerene and tetrathiafulvalene derivative in Langmuir-Blodgett films

Takayoshi Nakamura, Hideto Miyata, Keisuke Wakahara, Tomoyuki Akutagawa, Tatsuo Hasegawa, Hiroyuki Hasegawa, Shinro Mashiko, Christian A. Christensen, Jan Becher

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Structures and electronic states of a 1:1 mixture of bis-tetrathiafulvalene annulated macrocycle (1) and C 60 in Langmuir films at the air-water interface and Langmuir-Blodgett (LB) films on solid substrates were examined. Compression of the Langmuir films induced for the first time a phase transition from a weakly interacting state without charge transfer (CT) to a neutral CT state. The scanning force microscope images of LB films transferred onto mica by a single withdrawal showed quite different spatial patterns depending on the CT states. When deposited at around 1 mNm -1, a domain structure with 3 nm height was obtained, which corresponded to the state without CT interaction. Contrastingly, once the CT interaction was induced by applying surface pressure, a network structure was observed with a height of 6 nm. The CT band, whose transition moment was almost parallel to the substrate surface, was observed at 11.5 × 10 3 cm -1 in the polarized UV-VISNIR spectra of the films deposited at 9 mNnr -1. The phase transition was irreversible, although the surface pressure-area isotherm showed a reversible behavior below 9 mNm -1. The morphology and electronic state of the film was controllable merely by changing the surface pressure at the air-water interface.

Original languageEnglish
Pages (from-to)1833-1837
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume6
Issue number6
DOIs
Publication statusPublished - 2006 Jun 1
Externally publishedYes

Keywords

  • AFM
  • Charge Transfer Transition
  • Fullerene
  • Langmuir-Blodgett Film
  • Nanowire

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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