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Active Molecular Plasmonics: Controlling Plasmon Resonances with Molecular Switches

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Yue Bing Zheng^†, Ying-Wei Yang^‡, Lasse Jensen^§, Lei Fang, Bala Krishna Juluri^†, Amar H. Flood, Paul S. Weiss^§, J. Fraser Stoddart*^‡ and Tony Jun Huang*^†

Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802, California Nanosystems Institute and Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, Departments of Chemistry and Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, Department of Chemistry, Northwestern University, Evanston, Illinois 60208, and Department of Chemistry, Indiana University, Bloomington, Indiana 47405

Nano Lett., 2009, 9 (2), pp 819–825

DOI: 10.1021/nl803539g

Publication Date (Web): January 2, 2009

* To whom correspondence should be addressed: Professor J. Fraser Stoddart, Department of Chemistry, Northwestern University, 2145 Sheridan Rd, Evanston, IL 60208-3113; tel, (+1)-847-491-3793; fax, (+1)-847-491-1009; e-mail, stoddart@northwestern.edu. Professor Tony Jun Huang, Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802-6812; tel, (+1)-814-863-4209; fax, (+1)-814-865-9974; e-mail, junhuang@psu.edu., †

Department of Engineering Science and Mechanics, The Pennsylvania State University.

, ‡

California Nanosystems Institute and Department of Chemistry and Biochemistry, University of California.

, §

Departments of Chemistry and Physics, The Pennsylvania State University.

Department of Chemistry, Northwestern University.

Department of Chemistry, Indiana University.

Section:

Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes

Abstract

A gold nanodisk array, coated with bistable, redox-controllable [2]rotaxane molecules, when exposed to chemical oxidants and reductants, undergoes switching of its plasmonic properties reversibly. By contrast, (i) bare gold nanodisks and (ii) disks coated with a redox-active, but mechanically inert, control compound do not display surface-plasmon-based switching. Along with calculations based on time-dependent density functional theory, these experimental observations suggest that the nanoscale movements within surface-bound “molecular machines” can be used as the active components in plasmonic devices.

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