Joseph Tracy
Professor
University Faculty Scholar
- 919-513-2623
- jbtracy@ncsu.edu
- Engineering Building I (EB1) 3074D
- Visit My Website
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
Physical Chemistry
Massachusetts Institute of Technology
Chemistry
University of California, Santa Barbara
Publications
- 3D-Printed Silicone Soft Architectures with Programmed Magneto-Capillary Reconfiguration
- Roh, S., Okello, L. B., Golbasi, N., Hankwitz, J. P., Liu, J. A.-C., Tracy, J. B., & Velev, O. D. (2019), ADVANCED MATERIALS TECHNOLOGIES, 4(4). https://doi.org/10.1002/admt.201800528
- 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., Jr. (2018), Analytical Chemistry, 10(22), 13702–13707. 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(18), 6249–6258. 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., Godínez-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