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 language | English |
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Pages (from-to) | 1833-1837 |
Number of pages | 5 |
Journal | Journal of Nanoscience and Nanotechnology |
Volume | 6 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2006 Jun 1 |
Externally published | Yes |
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