Light-Induced Ostwald Ripening of Organic Nanodots to Rods

详细信息    查看全文

• 作者：Sankarapillai Mahesh ; Anesh Gopal ; Rajasekaran Thirumalai ; Ayyappanpillai Ajayaghosh
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：May 2, 2012
• 年：2012
• 卷：134
• 期：17
• 页码：7227-7230
• 全文大小：322K
• 年卷期：v.134,no.17(May 2, 2012)
• ISSN：1520-5126

文摘

Ostwald ripening allows the synthesis of 1D nanorods of metal and semiconductor nanoparticles. However, this phenomenon is unsuccessful with organic 蟺-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鈥?4%) trans鈥揷is isomerization of the azobenzene moiety and the consequent dipole鈥揹ipole interaction in a nonpolar solvent is believed to be the driving force for the ripening of the nanodots to rods.