Richard P. Van Duyne, Morrison Professor
Department of Chemistry
Northwestern University

E-mail: vanduyne@chem.northwestern.edu
Phone: 847-491-3516

BS, Rensselaer Polytechnic Institute
PhD, University of North Carolina

Alfred P. Sloan Fellow
Coblentz Memorial Prize in Molecular Spectroscopy
National Fresenius Award, Phi Lambda Upsilon
Pittsburgh Spectroscopy Award
Excellence in Surface Science Award, Surfaces of Biomaterials Foundation
Fellow, American Association for the Advancement of Science
Fellow, American Physical Society
Editorial Advisory Boards, Encyclopedia of Scientific Instrumentation, Laser Chemistry

Research Areas
The multidisciplinary research program of the Van Duyne group seeks to understand the relationships between adsorbate structure, surface structure, and the dynamics of elementary surface processes. Driving their interest in this topic is the importance of surface-confined molecules in many technologies: electrocatalysis, fuel cells, self-assembled monolayers (SAMs), heterogeneous catalysis, photochemical/electrical energy conversion, environmental photocatalysis, separation science, chemical/biological sensors, and the epitaxial growth of photonic thin-film materials.

Surface spectroscopy and microscopy are the general tools they use to probe surface structure and function. Specifically, they use surface-enhanced Raman spectroscopy (SERS) as well as other surface-enhanced spectroscopies (SES). The surface microscopies are far-field, spatially-resolved SERS, and ambient/UHV scanning tunneling microscopy (STM)/atomic force microscopy (AFM).

One current project involves study of the relationship between the nanostructure, experimentally measured on the 1-1000 nm size scale by AFM and/or STM, and the optical properties of a surface-enhanced material. Theoretical interpretation of results is based on the electromagnetic (EM) mechanism of SERS. In addition, using nanosphere lithography (NSL), they have fabricated periodic particle array (PPA) surfaces with an ordered nanostructure. The figure shows the use of NSL to fabricate surface-confined cluster arrays suitable for optical property probing with far-field microscopy.

Another project examines the structure/dynamics of surface-confined biological molecules at electrochemical interfaces. They have demonstrated that Ag film over nanosphere (AgFON) electrodes are extremely reproducible and stable and, when functionalized with mercaptocarboxylic acid SAMs, facilitate high-affinity electrostatic binding between positively charged biomolecules such as cyto chrome c (cyt c) and the surface while preventing direct contact between them.

A third research focus is the structure/dynamics of molecular adsorbates in UHV studied by the combination of SERS and temperature-programmed desorption (TPD).

Their fourth area of emphasis is the mechanism of epitaxial growth of photonic materials by pulsed laser deposition (PLD) using time-of-flight mass spectrometry (TOFMS) diagnostics. PLD has been demonstrated for the first time as an approach to the problem of epitaxial thin-film growth of strained-layer III-V semi conductor materials.

Related Publications
"Nanosphere Lithography: Size-Tunable Silver Nanoparticle and Surface Cluster Arrays" [with J. C. Hulteen, D. A. Treichel, M. T. Smith, M. L. Duval, and T. R. Jensen], J. Phys. Chem. B 103:3854-63 (1999).

"Nanosphere Lithography: Surface Plasmon Resonance Spectrum of a Periodic Array of Silver Nano particles by UV-vis Extinction Spectros copy and Electrodynamic Modeling" [with T. R. Jensen and G. C. Schatz], J. Phys. Chem. B 103:2394-2401 (1999).

"Raman Spectra and Calculated Vibrational Frequencies of Size-Selected C16, C18, and C20 Clusters" [with A. K. Ott, G. A. Rechtsteiner, C. Felix, O. Hampe, M. F. Jarrold, and K. Raghavachari], J. Chem. Phys. 109:9652-55 (1998).

"Low-Loss Liquid-Core Optical Fiber for Low-Refractive-Index Liquids: Fabrication, Characteriza-tion, and Application in Raman Spectroscopy" [with R. I. Altkorn, I. Koev, and M. Litorja], Appl. Opt. 36:8992-98 (1997).

"Surface-Enhanced Raman Spectroscopy of trans-Stilbene Adsorbed on Silver Film over Nanosphere Surfaces Modified by Platinum or Alkanethiol Depos ition" [with P. Freunscht and S. Schneider], Chem. Phys. Lett. 281:372-78 (1997)