Investigating Electrochemical Properties, Composition and Oxidation States of Nanoparticles and Catalysts Using Electrochemistry and XPS
EMSL Project ID
2506a
Abstract
Objectives. This USER proposal describes a study of the electrochemical properties and compositions of metal, alloy and semiconductor nanoparticles and catalysts using electrochemistry and X-ray Photoelectron Microscopy (XPS). We will be in collaboration with scientists at EMSL to use electrochemistry and XPS instrumentation to study nanometer-sized materials prepared at SUNY. The objectives are 1) to develop a fundamental understanding of the correlation of the composition of the nanoparticles with synthetic and processing parameters, 2) to determine the surface oxidation states of nanoparticles, and 3) to establish the relationship between the electrocatalytic activity and the composition after different catalytic activation treatments. Approach. Nanometer-sized particles consisting of metal or semiconductor nanocrystals cores and organic shells are intriguing for a number of reasons. First, the gradual transition of the metallic core from bulk to molecular properties leads to electronic quantization effect with interesting electrical, optical and magnetic properties. Secondly, the shell properties can be systematically manipulated to provide models of ultrafine tuning for chemical/biological sensing. There are potential technological applications in areas of microelectronics, optical devices, magnetic materials, chemical sensing and catalytic processes. We have developed several synthetic, processing and assembling routes towards chemically or catalytically active thin film materials, but an exact correlation of these properties with the composition of the nanomaterials is yet to be determined. Our approach is to use electrochemistry and XPS technique to gain fundamental insights into this correlation. Funding Agency: American Chemical Society -Petroleum Research Foundation Relevant References: 1. Novel Spherical Assembly of Gold Nanoparticles Mediated by a Tetradentate Thioether, M. M. Maye, S. C. Chun, L. Han, D, Rabinovich, C. J. Zhong, J. Amer. Chem. Soc., in press. 2. Electroactivity of Cu2+ at a Thin Film Assembly of Gold Nanoparticles Linked by 11-Mercaptoundecanoic Acid, L. B. Israel, N. Kariuki, L. Han, M. M. Maye, J. Luo, C. J. Zhong, J. Electroanal. Chemistry, 517, 69 (2001). 3. Core-Shell Assembled Nanoparticles as Catalysts, C. J. Zhong, M. M. Maye, Advanced Materials, 13, 1507 (2001). 4. Core-Shell Nanostructured Nanoparticle Films as Chemically-Sensitive Interfaces, L. Han, D. R. Daniel, M. M. Maye, C.J. Zhong, Analytical Chemistry, 73, 4441 (2001). 5. Gold-Platinum Alloy Nanoparticle Assembly as Catalyst for Methanol Electrooxidation Y. Lou, M. M. Maye, L. Han, J. Luo and C. J. Zhong, Chemical Communications, 5, 473, (2001). 6. Probing pH-Tuned Morphological Changes in Core-Shell Nanoparticle Assembly Using Atomic Force Microscopy, M. M. Maye, J. Luo, L. Han, C.J. Zhong, Nano Letters, 1, 575 (2001). 7. Quartz-Crystal Microbalance and Spectrophotometric Assessments of Inter-Core and Inter-Shell Reactivities in Nanoparticle Film Formation and Growth, L. Han, M.M. Maye, F.L. Leibowitz, N.K. Ly, C.J. Zhong, J. Materials Chemistry, 11, 1259 (2001). 8. Core-Shell Gold Nanoparticle Assembly as Novel Electrocatalyst of CO Oxidation, M. M. Maye, Y. Lou and C. J. Zhong, Langmuir, 16, 7520 (2000). 9. Manipulating core-shell reactivities for processing nanoparticle sizes and shapes, M. M. Maye and C. J. Zhong, J. Materials Chemistry, 10, 1895 (2000). 10. Imparting Biomimetic Ion-Gating Recognition Properties to Electrodes with Hydrogen-Bonding Structured Core-Shell Nanoparticle Network, W.X. Zheng, M. M. Maye, F. L. Leibowitz, C. J. Zhong, Analytical Chemistry, 72, 2190 (2000). 11. Heating-Induced Evolution of Thiolate-Encapsulated Gold Nanoparticles: A Strategy for Size and Shape Manipulations, M. M. Maye, W. X. Zheng, F. L. Leibowitz, N. K. Ly, C. J. Zhong, Langmuir, 16, 490 (2000).
Project Details
Project type
Exploratory Research
Start Date
2005-05-02
End Date
2007-07-06
Status
Closed
Released Data Link
Team
Principal Investigator
Related Publications
Wang LY, J Luo, Q Fan, M Suzuki, IS Suzuki, MH Engelhard, Y Lin, N Kim, J Wang, and C Zhong. 2005. "Monodispersed core-shell Fe3O4@Au nanoparticles ." Journal of Physical Chemistry B 109(46):21593-21601.