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Ionic-Ligand-Mediated Electrochemical Charging of Anionic Gold Nanoparticle Films and Anionic−Cationic Gold Nanoparticle Bilayers

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Shannon W. Boettcher^†, Martin Schierhorn^†, Nicholas C. Strandwitz^‡, Mark C. Lonergan^§ and Galen D. Stucky*^†^‡

Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, Materials Department, University of California, Santa Barbara, California 93106, and Department of Chemistry, The Materials Science Institute, University of Oregon, Eugene, Oregon 97403

J. Phys. Chem. C, 2010, 114 (9), pp 4168–4178

DOI: 10.1021/jp910308s

Publication Date (Web): February 15, 2010

* To whom correspondence should be addressed. E-mail: stucky@chem.ucsb.edu., †

Department of Chemistry and Biochemistry, University of California.

, ‡

Materials Department, University of California.

, §

University of Oregon.

Section:

Electrochemistry

Abstract

Gold nanoparticles 2 nm in diameter were synthesized with, on average, between 0 and 5.4 anionic thiols per particle. An electrochemical quartz-crystal microbalance was used to monitor the motion of ions and electrons during redox cycling (charging) of thin films of these nanoparticles. When the electrochemistry was performed using a polyanion electrolyte too large to penetrate the nanoparticle film, the degree of oxidation that was possible was found to be dictated by the average number of anionic ligands on the particle surface available for charge compensation. These anionic nanoparticle thin films were combined with previously reported/synthesized cationic nanoparticles into solution-processed nanoparticle film bilayers. We demonstrate using these bilayers that the control over charge compensation kinetics afforded by the use of a polyelectrolyte supporting electrolyte in conjunction with ionic surface functionalization allows for the selective charging of one layer of nanoparticles over the other and for the realization of structures consisting of oxidized and reduced nanoparticles in direct contact.

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Redox Charging of Nanoparticle Thin Films in Ionic Liquids
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- Redox Charging of Nanoparticle Thin Films in Ionic Liquids
  Wanzhen Li and Bin Su
  The Journal of Physical Chemistry C2010 114 (42), 18103-18108
  Thin films consisting of alkanethiolate protected gold nanoparticles (MPCs) immersed in room temperature ionic liquids (ILs) were investigated by electrochemistry. The anion-dependent oxidative charging of MPC films was observed in imidazolium based ILs, ...
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