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CNMS Science Program Highlight Understanding Metal-Directed Growth of Single-Crystal M-TCNQF 4 Organic Nanowires

CNMS Science Program Highlight Understanding Metal-Directed Growth of Single-Crystal M-TCNQF 4 Organic Nanowires K. Xiao, M. Yoon, A. J. Rondinone , E. A. Payzant , and D. B. Geohegan Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee.

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CNMS Science Program Highlight Understanding Metal-Directed Growth of Single-Crystal M-TCNQF 4 Organic Nanowires

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  1. CNMS Science Program Highlight Understanding Metal-Directed Growth of Single-Crystal M-TCNQF4 Organic Nanowires K. Xiao, M. Yoon,A. J. Rondinone, E. A. Payzant,and D. B. Geohegan Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee Achievement (a) • The growth processes of crystalline organic nanowires (CONs) of Ag- and Cu-TCNQF4 were revealed by in situ X-ray diffraction and first principles calculations. • (TCNQF4 = tetrafluorotetracyano-p-quinodimethane) • Strong charge transfer interactions between different metal substrates and vapor-phase TCNQF4 molecules were found necessary to effectively grow metal-TCNQF4nanowires, with new growth occurring at the tip from metal ion diffusion along channels within the 1D nanowire. (b) Challenge • Understanding the vapor-solid chemical reaction (VSCR) growth process, whereby metals are consumed and integrated into the growing nanowire. Significance Figure: (a) TCNQF4molecules bend due to strong charge transfer interactions with Cu and Ag, leading to effective growth of Cu-TCNQF4 and Ag-TCNQF4 nanowires. (b)Growth of Ag-TCNQF4 nanowires occurs at their tips, from Ag+ ions that diffuse from the Ag film through the nanowire. • Understanding the growth process of CONs by VSCR will enable the synthesis of these novel organic building blocks for solar energy harvesting and nanoelectronics.  This work was published online in the Journal of the American Chemical Society (DOI:10.1021/ja301456p) on April 16, 2012. This research was conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U. S. Department of Energy.

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