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A New Approach to Well‐Ordered Quantum Dots
Author(s) -
Schmid Günter,
Beyer Norbert
Publication year - 2000
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(200005)2000:5<835::aid-ejic835>3.0.co;2-n
Subject(s) - chemistry , monolayer , transmission electron microscopy , dichloromethane , crystallography , molecule , cluster (spacecraft) , amphiphile , phase (matter) , polymer , self assembly , electron diffraction , nanotechnology , diffraction , solvent , copolymer , organic chemistry , materials science , biochemistry , physics , computer science , optics , programming language
Extended ordered monolayers of ligand stabilized Au 55 clusters are formed at the phase boundary between water and dichloromethane. The water phase, containing amphiphilic molecules like per‐6‐deoxy‐6‐thio‐α‐cyclodextrin (1) or poly(vinylpyrrolidone) (2) , is covered by a thin film of a solution of [Au 55 (PPh 3 ) 12 Cl 6 ] in dichloromethane. The interaction of the cluster molecules with the thiol functions of 1 or the polymer chains of 2 form perfect cluster orders of hexagonal and cubic structure. The monolayers can be transferred onto solid substrates by a simple dipping process. The use of carbon coated copper grids allows the investigation of the monolayers by transmission electron microscopy (TEM). Electron diffraction experiments under a microscope prove the hexagonal and cubic arrangements. The reason for the formation of the one or the other modification is still unknown.