Joseph Tracy

Professor

University Faculty Scholar
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Many kinds of nanoscale materials have size- and shape-tunable physical properties arising from their reduced dimensions and high surface area to volume ratio. We prepare colloidal magnetic, metallic, and semiconductor nanoparticles using a “bottom-up” approach starting from molecular precursors. Surface functionalization allows for integration with other kinds of materials, such as polymers and biological systems. Applying magnetic fields to suspensions of magnetic nanoparticles drives their assembly into chains, altering their magnetic and mechanical properties. The surface plasmon resonance of noble metal nanoparticles is sensitive to interparticle coupling and is useful for photothermal heating. Semiconductor quantum dots have high fluorescence quantum yields and are not susceptible to photobleaching.

Dr. Tracy’s research interests include the synthesis, characterization, and self-assembly of colloidal magnetic, metallic, and semiconductor nanoparticles, and their applications in composite materials, medicine, and catalysis.

Education

Ph.D. 2005

Physical Chemistry

Massachusetts Institute of Technology

B.S. 2000

Chemistry

University of California, Santa Barbara

Publications

Quantification of Interface-Dependent Plasmon Quality Factors Using Single-Beam Nonlinear Optical Interferometry
Zhao, T., Steves, M. A., Chapman, B. S., Tracy, J. B., & Knappenberger, K. L. (2018), Analytical Chemistry, 10. https://doi.org/10.1021/acs.analchem.8b04101
Sequential Actuation of Shape-Memory Polymers through Wavelength-Selective Photothermal Heating of Gold Nanospheres and Nanorods
Mishra, S. R., & Tracy, J. B. (2018), ACS Applied Nano Materials, 6. https://doi.org/10.1021/acsanm.8b00394
Understanding and Controlling the Morphology of Silica Shells on Gold Nanorods
Rowe, L. R., Chapman, B. S., & Tracy, J. B. (2018), Chemistry of Materials, 9. https://doi.org/10.1021/acs.chemmater.8b00794
Chained Iron Microparticles for Directionally Controlled Actuation of Soft Robots
Schmauch, M. M., Mishra, S. R., Evans, B. A., Velev, O. D., & Tracy, J. B. (2017), ACS Applied Materials & Interfaces, 9(13), 11895–11901. https://doi.org/10.1021/acsami.7b01209
Direct monitoring of pulmonary disease treatment biomarkers using plasmonic gold nanorods with diffusion-sensitive OCT
Blackmon, R. L., Kreda, S. M., Sears, P. R., Chapman, B. S., Hill, D. B., Tracy, J. B., … Oldenburg, A. L. (2017), Nanoscale, 9(15), 4907–4917. https://doi.org/10.1039/c7nr00376e
Enhanced Electrochemical Lithium-Ion Charge Storage of Iron Oxide Nanosheets
Niu, S., McFeron, R., Godı́nez-Salomón, F., Chapman, B. S., Damin, C. A., Tracy, J. B., … Rhodes, C. P. (2017), Chemistry of Materials, 29(18), 7794–7807. https://doi.org/10.1021/acs.chemmater.7b02315
Heteroaggregation Approach for Depositing Magnetite Nanoparticles onto Silica-Overcoated Gold Nanorods
Chapman, B. S., Wu, W.-C., Li, Q., Holten-Andersen, N., & Tracy, J. B. (2017), Chemistry of Materials, 29(24), 10362–10368. https://doi.org/10.1021/acs.chemmater.7b03481
Microwave Enhancement of Autocatalytic Growth of Nanometals
Ashley, B., Vakil, P. N., Lynch, B. B., Dyer, C. M., Tracy, J. B., Owens, J., & Strouse, G. F. (2017), ACS Nano, 11(10), 9957–9967. https://doi.org/10.1021/acsnano.7b04040
Nanoscale steady-state temperature gradients within polymer nanocomposites undergoing continuous-wave photothermal heating from gold nanorods
Maity, S., Wu, W.-C., Tracy, J. B., Clarke, L. I., & Bochinski, J. R. (2017), Nanoscale, 9(32), 11605–11618. https://doi.org/10.1039/c7nr04613h
Size and Composition Control of {CoNi} Nanoparticles and Their Conversion into Phosphides
Marusak, K. E., Johnston-Peck, A. C., Wu, W.-C., Anderson, B. D., & Tracy, J. B. (2017). Size and Composition Control of CoNi Nanoparticles and Their Conversion into Phosphides. Chemistry of Materials, 29(7), 2739–2747. https://doi.org/10.1021/acs.chemmater.6b04335,

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