Molecular-Level Insulation: An Approach to Controlling Interfacial Charge Transfer

POSTER

Abstract

In this presentation, we report a novel approach to the attachment of molecular dyes to nanocrystalline TiO$_{2 }$electrodes. New azo dye rotaxane was synthesized by encapsulating an organic dye inside cyclodextrin, and it is shown to exhibit strong binding to the metal oxide electrode. The encapsulation results in a well-defined spatial separation of the organic dye from the electrode surface, allowing the photogeneration of a long-lived charge separated state. Herein we demonstrate that such cyclodextrin threaded sensitizer dye rotaxanes can be used to functionalise nanocrystalline TiO$_{2}$, resulting in a long-lived photogenerated charge separation.

Authors

  • Jong Seung Park

  • Mohan Srinivasarao

    • Georgia Institute of Technology
    • School of Polymer, Textile and Fiber Engineering and School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA
    • School of Polymer, Textile and Fiber Engineering, School of Chemistry and Biochemistry, Center for Advanced Research in Optical Microscopy (CAROM)
    • Georgia Institute of Technology, Atlanta, GA 30332
    • School of Polymer, Fiber and Textile Engineering; School of Chemistry and Biochemistry
    • School of Polymer, Textiles and Fiber engineering and School of Chemistry and Biochemistry,Georgia Institute of Technology
    • School of Polymer, Textile and Fiber Engineering and School of Chemistry and Biochemistry

  • Saif A. Haque

  • James R. Durrant

    • Centre for Electronic Materials and Devices, Department of Chemistry, Imperial College of Science Technology and Medicine, London SW7 2AZ, U.K.