Light-Induced Ostwald Ripening of Organic Nanodots to Rods

Ostwald ripening allows the synthesis of 1D nanorods of metal and semiconductor nanoparticles. However, this phenomenon is unsuccessful with organic π-systems due to their spontaneous self-assembly to elongated fibers or tapes. Here we demonstrate the uses of light as a versatile tool to control the...

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Bibliographic Details
Published inJournal of the American Chemical Society Vol. 134; no. 17; pp. 7227 - 7230
Main Authors Mahesh, Sankarapillai, Gopal, Anesh, Thirumalai, Rajasekaran, Ajayaghosh, Ayyappanpillai
Format Journal Article
LanguageEnglish
Published WASHINGTON American Chemical Society 02.05.2012
Amer Chemical Soc
Subjects
Chemistry
Chemistry, Multidisciplinary
isomerization
nanorods
Ostwald ripening
Physical Sciences
quantum dots
Science & Technology
solvents
ORGANIZATION
POLYMERS
MANIPULATION
CDTE NANOPARTICLES
ASSEMBLIES
PARTICLES
AZOBENZENE
OLIGO(P-PHENYLENEETHYNYLENE)S
CHIRALITY
AGGREGATION
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Summary:Ostwald ripening allows the synthesis of 1D nanorods of metal and semiconductor nanoparticles. However, this phenomenon is unsuccessful with organic π-systems due to their spontaneous self-assembly to elongated fibers or tapes. Here we demonstrate the uses of light as a versatile tool to control the ripening of amorphous organic nanodots (ca. 15 nm) of an azobenzene-derived molecular assembly to micrometer-sized supramolecular rods. A surface-confined dipole variation associated with a low-yield (13–14%) trans–cis isomerization of the azobenzene moiety and the consequent dipole–dipole interaction in a nonpolar solvent is believed to be the driving force for the ripening of the nanodots to rods.
Bibliography:ObjectType-Article-1
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ISSN:0002-7863
1520-5126
1520-5126
DOI:10.1021/ja301002g