Electrochemical doping of ionically functionalized inorganic nanoparticle assemblies

COLL 447

Shannon W. Boettcher, sboettcher@chem.ucsb.edu1, Sebastian Berg2, and Galen D. Stucky1. (1) Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, CA 93106, (2) Department of Chemistry, University of Muenster, Muenster, Germany
Electronic materials compatible with low-temperature solution-processes such as printing or spraying could revolutionize the electronics industry. Ligand-stabilized inorganic nanoparticles are a promising class of such materials that have been used to fabricate many prototype devices. However, the difficulties associated with introducing stable electronic dopants with precise concentration profiles into such materials have limited their utility for use in many core device structures. We describe a general method to control the electronic dopant type (“n” or “p”) and density in ligand-stabilized nanoparticle thin films by the covalent binding of “surface dopants” (ligands with ionic functionality) coupled with electrochemical charge transfer. To demonstrate this concept, gold nanoparticles with controlled numbers of cationic and anionic ligands have been synthesized and the doping process has been studied in-situ using an electrochemical quartz crystal microbalance. Efforts to fabricate/characterize stable pn junctions between charged cationic and anionic particles will also be discussed.
 

Electrochemistry-Enabled Nano S&T
9:00 AM-11:20 AM, Thursday, April 10, 2008 Morial Convention Center -- Rm. 229, Oral

Division of Colloid & Surface Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008