Light-induced ostwald ripening of organic nanodots to rods

Mahesh, Sankarapillai ; Gopal, Anesh ; Thirumalai, Rajasekaran ; Ajayaghosh, Ayyappanpillai (2012) Light-induced ostwald ripening of organic nanodots to rods Journal of the American Chemical Society, 134 (17). pp. 7227-7230. ISSN 0002-7863

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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.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:96139
Deposited On:05 Dec 2012 09:02
Last Modified:05 Dec 2012 09:02

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