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New Transparent Metal‐like Bilayer Composite Films with Highly Conducting Layers of θ‐(BET‐TTF) 2 Br·3H 2 O Nanocrystals
Author(s) -
MasTorrent M.,
Laukhina E.,
Rovira C.,
Veciana J.,
Tkacheva V.,
Zorina L.,
Khasanov S.
Publication year - 2001
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/1616-3028(200108)11:4<299::aid-adfm299>3.0.co;2-n
Subject(s) - materials science , bilayer , nanocrystalline material , nanocrystal , bet theory , metal , composite number , conductivity , layer (electronics) , chemical engineering , nanotechnology , composite material , metallurgy , chemistry , membrane , genetics , adsorption , engineering , biology
A flexible low‐density metallic material, which is extremely transparent, was obtained using as active component the highly conducting molecular metal θ‐(BET‐TTF) 2 Br·3H 2 O, BET‐TTF = bis(ethylenethio)tetrathiafulvalene. This material is a bilayer (BL) film that was prepared by treating a polycarbonate film containing 2 wt.‐% of molecularly dispersed BET‐TTF with vapor of a Br 2 /CH 2 Cl 2 solution. Optimum conditions for the preparation of very transparent metallic materials were established. The X‐ray diffraction patterns indicate that the conducting layer of the BL films is formed by well a * oriented θ‐(BET‐TTF) 2 Br·3H 2 O nanocrystals, which are clearly observed in the SEM images. Conductivity measurements confirm that the nanocrystalline layers have the same transport properties as those of the single crystals, displaying metal‐like behavior down to He temperature and the highest room temperature conductivity (120 Ω –1 cm –1 ) reported so far for this kind of film.