Hybrid composites of monodisperse pi-conjugated rodlike organic compounds and semiconductor quantum particles.
Composite materials of quantum particles (Q-particles) arranged in layers within crystalline powders of pi-conjugated, rodlike dicarboxylic acids are reported. The synthesis of the composites, either as three-dimensional crystals or as thin films at the air-water interface, comprises a two-step process: 1) The preparation of the Cd salts 6 (Cd), 8 (Cd) or Pb salts 6 (Pb), 8 (Pb) of the oligo(p-phenyleneethynylene)dicarboxylic acids 6 (H), 8 (H), in which the metal ions are arranged in ribbons and are separated by the long axis of the organic molecules, as demonstrated by X-ray powder diffraction analysis of the solids and grazing incidence X-ray diffraction analysis of the films on water. 2) Topotactic solid/gas reaction of these salts with H(2)S to convert the metal ions into Q-particles of CdS or PbS embedded in the organic matrix that consists of the acids 6 (H) and 8 (H). These hybrid materials have been characterized by X-ray photoelectron spectroscopy and transmission electron microscopy.
Hensel
Volker
V
Department of Materials and Interfaces, The Weizmann Institute of Science, 76100 Rehovot. Israel.
Godt
Adelheid
A
Popovitz-Biro
Ronit
R
Cohen
Hagai
H
Jensen
Torben R
TR
Kjaer
Kristian
K
Weissbuch
Isabelle
I
Lifshitz
Efrat
E
Lahav
Meir
M