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Reversible Gelation of II–VI Nanocrystals: The Nature of Interparticle Bonding and the Origin of Nanocrystal Photochemical Instability
Author(s) -
Pala Irina R.,
Arachchige Indika U.,
Georgiev Daniel G.,
Brock Stephanie L.
Publication year - 2010
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201000034
Subject(s) - tetramethylammonium hydroxide , nanocrystal , hydroxide , tetramethylammonium , photochemistry , dispersion (optics) , chemical engineering , instability , chemical bond , bond cleavage , materials science , cleavage (geology) , chemistry , inorganic chemistry , nanotechnology , organic chemistry , catalysis , ion , physics , engineering , fracture (geology) , optics , composite material , mechanics
Programmable assembly and disassembly : Chemical and spectroscopic studies show that SeSe bond formation is responsible for the oxidation‐induced aggregation of thiolate‐capped CdSe nanocrystals to gels. Treatment with reducing agents leads to SeSe bond cleavage and dispersion of the gel. This process can be cycled, resulting in successively smaller particles (see picture; MUA = 11‐mercaptoundecanoic acid, TMAH = tetramethylammonium hydroxide).