Photosensitization of carbon nanotubes using dye aggregates

    Authors

    R. Tsuchikawa; H. Y. Ahn; S. Yao; K. D. Belfield;M. Ishigami

    Comments

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    Abbreviated Journal Title

    J. Phys.-Condes. Matter

    Keywords

    SCANNING-TUNNELING-MICROSCOPY; MEMORY DEVICES; SQUARAINE DYES; THIN-FILMS; FLUORESCENCE; ABSORPTION; TRANSISTOR; SURFACES; MOBILITY; BEHAVIOR; Physics, Condensed Matter

    Abstract

    Ordered assemblies of dye molecules, dye aggregates, possess significantly larger molar optical absorptivity than dye monomers. Yet, aggregates have not been utilized for photosensitizing nanoscale electronic devices. We find that single-walled carbon nanotubes, which are cleaned down to the atomic scale, template the growth of squaraine dye aggregates and these aggregates effectively photosensitize nanotubes. Templating of aggregates by nanotubes and functionalization of nanotubes with ordered molecular films are reported for the first time. The sensitivity achieved by aggregate-functionalized nanotube network devices is approximately an order of magnitude better than those of similar nanotube devices functionalized with dye monomers and photoactive polymers.

    Journal Title

    Journal of Physics-Condensed Matter

    Volume

    23

    Issue/Number

    20

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    5

    WOS Identifier

    WOS:000290212300004

    ISSN

    0953-8984

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