Joseph Tracy

Professor

University Faculty Scholar
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  • Engineering Building I (EB1) 3074D
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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

Understanding and Controlling the Morphology of Silica Shells on Gold Nanorods
Rowe, L. R., Chapman, B. S., & Tracy, J. B. (2018), CHEMISTRY OF MATERIALS, 30(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.
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.
Enhanced electrochemical lithium-ion charge storage of iron oxide nanosheets
Niu, S., McFeron, R., Godinez-Salomon, F., Chapman, B. S., Damin, C. A., Tracy, J. B., … Rhodes, C. P. (2017), Chemistry of Materials, 29(18), 7794–7807.
Heteroaggregation approach for depositing magnetite nanoparticles onto silica-overcoated gold nanorods
Chapman, B. S., Wu, W. C., Lo, Q. C., Holten-Andersen, N., & Tracy, J. B. (2017), Chemistry of Materials, 29(24), 10362–10368.
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.
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), Chemistry of Materials, 29(7), 2739–2747.
Diffusion-sensitive optical coherence tomography for real-time monitoring of mucus thinning treatments
Blackmon, R. L., Kreda, S. M., Sears, P. R., Ostrowski, L. E., Hill, D. B., Chapman, B. S., … Oldenburg, A. L. (2016), In Optical coherence tomography and coherence domain optical methods in biomedicine xx (Vol. 9697).
Imaging extracellular matrix remodeling in vitro by diffusion-sensitive optical coherence tomography
Blackmon, R. L., Sandhu, R., Chapman, B. S., Casbas-Hernandez, P., Tracy, J. B., Troester, M. A., & Oldenburg, A. L. (2016), Biophysical Journal, 110(8), 1858–1868.
Selective and directional actuation of elastomer films using chained magnetic nanoparticles
Mishra, S. R., Dickey, M. D., Velev, O. D., & Tracy, J. B. (2016), Nanoscale, 8(3), 1309–1313. https://doi.org/10.1039/c5nr07410j
Silica overcoating of CdSe/CdS Core/shell quantum dot nanorods with controlled morphologies
Anderson, B. D., Wu, W. C., & Tracy, J. B. (2016), Chemistry of Materials, 28(14), 4945–4952.
Large-scale silica overcoating of gold nanorods with tunable shell thicknesses
Wu, W. C., & Tracy, J. B. (2015), Chemistry of Materials, 27(8), 2888–2894.
Photochemical synthesis of size-tailored hexagonal ZnS quantum dots
Gonzalez, C. M., Wu, W. C., Tracy, J. B., & Martin, B. (2015), Chemical Communications, 51(15), 3087–3090.
Thermal stability of gold nanoparticles embedded within metal oxide frameworks fabricated by hybrid modifications onto sacrificial textile templates
Padbury, R. P., Halbur, J. C., Krommenhoek, P. J., Tracy, J. B., & Jur, J. S. (2015), Langmuir, 31(3), 1135–1141.
A dual wavelength-activatable gold nanorod complex for synergistic cancer treatment
Pacardo, D. B., Neupane, B., Rikard, S. M., Lu, Y., Mo, R., Mishra, S. R., … Gu, Z. (2015), Nanoscale, 7(28), 12096–12103. https://doi.org/10.1039/c5nr01568e
Aerosynthesis: Growth of vertically-aligned carbon nanofibres with air DC plasma
Kodumagulla, A., Varanasi, V., Pearce, R. C., Wu, W. C., Hensley, D. K., Tracy, J. B., … Melechko, A. V. (2014), Nanomaterials and Nanotechnology, 4.
Control of branching in Ni3C1-x nanoparticles and their conversion into Ni12P5 Nanoparticles
Sarac, M. F., Wu, W. C., & Tracy, J. B. (2014), Chemistry of Materials, 26(10), 3057–3064.
Nanoparticle conversion chemistry: Kirkendall effect, galvanic exchange, and anion exchange
Anderson, B. D., & Tracy, J. B. (2014), Nanoscale, 6(21), 12195–12216.
Probing biological nanotopology via diffusion of weakly constrained plasmonic nanorods with optical coherence tomography
Chhetri, R. K., Blackmon, R. L., Wu, W. C., Hill, D. B., Button, B., Casbas-Hernandez, P., … Oldenburg, A. L. (2014), Proceedings of the National Academy of Sciences of the United States of America, 111(41), E4289–4297.
Spatial temperature mapping within polymer nanocomposites undergoing ultrafast photothermal heating via gold nanorods
Maity, S., Wu, W. C., Xu, C., Tracy, J. B., Gundogdu, K., Bochinski, J. R., & Clarke, L. I. (2014), Nanoscale, 6(24), 15236–15247.
Airbrushed nickel nanoparticles for large-area growth of vertically aligned carbon nanofibers on metal (Al, Cu, Ti) surfaces
Sarac, M. F., Anderson, B. D., Pearce, R. C., Railsback, J. G., Oni, A. A., White, R. M., … Tracy, J. B. (2013), ACS Applied Materials & Interfaces, 5(18), 8955–8960.
Anisotropic thermal processing of polymer nanocomposites via the photothermal effect of gold nanorods
Maity, S., Kozek, K. A., Wu, W. C., Tracy, J. B., Bochinski, J. R., & Clarke, L. I. (2013), Particle & Particle Systems Characterization, 30(2), 193–202.
Composition-mediated order-disorder transformation in FePt nanoparticles
Johnston-Peck, A. C., Cullen, D. A., & Tracy, J. B. (2013), Particle & Particle Systems Characterization, 30(8), 678–682.
Large-scale synthesis of gold nanorods through continuous secondary growth
Kozek, K. A., Kozek, K. M., Wu, W. C., Mishra, S. R., & Tracy, J. B. (2013), Chemistry of Materials, 25(22), 4537–4544.
Magnetic field-directed self-assembly of magnetic nanoparticle chains in bulk polymers
Krommenhoek, P. J., & Tracy, J. B. (2013), Particle & Particle Systems Characterization, 30(9), 759–763.
Magnetic field-directed self-assembly of magnetic nanoparticles
Tracy, J. B., & Crawford, T. M. (2013), MRS Bulletin, 38(11), 915–920.
Motility-, autocorrelation-, and polarization-sensitive optical coherence tomography discriminates cells and gold nanorods within 3D tissue cultures
Oldenburg, A. L., Chhetri, R. K., Cooper, J. M., Wu, W. C., Troester, M. A., & Tracy, J. B. (2013), Optics Letters, 38(15), 2923–2926.
Nanostructural transformations during the reduction of hollow and porous nickel oxide nanoparticles
Medford, J. A., Johnston-Peck, A. C., & Tracy, J. B. (2013), Nanoscale, 5(1), 155–159.
Transfer of vertically aligned carbon nanofibers to polydimethylsiloxane (PDMS) while maintaining their alignment and impalefection functionality
Pearce, R. C., Railsback, J. G., Anderson, B. D., Sarac, M. F., McKnight, T. E., Tracy, J. B., & Melechko, A. V. (2013), ACS Applied Materials & Interfaces, 5(3), 878–882.
Bulky Adamantanethiolate and Cyclohexanethiolate Ligands Favor Smaller Gold Nanoparticles with Altered Discrete Sizes
Krommenhoek, P. J., Wang, J. W., Hentz, N., Johnston-Peck, A. C., Kozek, K. A., Kalyuzhny, G., & Tracy, J. B. (2012), ACS Nano, 6(6), 4903–4911.
Laterally patterned magnetic nanoparticles
Jie, Y. N., Niskala, J. R., Johnston-Peck, A. C., Krommenhoek, P. J., Tracy, J. B., Fan, H. Q., & You, W. (2012), Journal of Materials Chemistry, 22(5), 1962–1968.
Phase transformation of alumina-coated FePt nanoparticles
Johnston-Peck, A. C., & Tracy, J. B. (2012), Journal of Applied Physics, 111(7).
Coating alumina on catalytic iron oxide nanoparticles for synthesizing vertically aligned carbon nanotube arrays
Wang, X., Krommenhoek, P. J., Bradford, P. D., Gong, B., Tracy, J. B., Parsons, G. N., … Zhu, Y. T. (2011), ACS Applied Materials & Interfaces, 3(11), 4180–4184. https://doi.org/10.1021/am201082m
Effects of ligand monolayers on catalytic nickel nanoparticles for synthesizing vertically aligned carbon nanofibers
Sarac, M. F., Wilson, R. M., Johnston-Peck, A. C., Wang, J. W., Pearce, R., Klein, K. L., … Tracy, J. B. (2011), ACS Applied Materials & Interfaces, 3(4), 936–940.
Formation and grain analysis of spin-cast magnetic nanoparticle monolayers
Johnston-Peck, A. C., Wang, J. W., & Tracy, J. B. (2011), Langmuir, 27(8), 5040–5046.
Imaging three-dimensional rotational diffusion of plasmon resonant gold nanorods using polarization-sensitive optical coherence tomography
Chhetri, R. K., Kozek, K. A., Johnston-Peck, A. C., Tracy, J. B., & Oldenburg, A. L. (2011), Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, 83(4).
Sinter-free phase conversion and scanning transmission electron microscopy of FePt nanoparticle monolayers
Johnston-Peck, A. C., Scarel, G., Wang, J. W., Parsons, G. N., & Tracy, J. B. (2011), Nanoscale, 3(10), 4142–4149.
Synthesis of Au(Core)/Ag(Shell) nanoparticles and their conversion to AuAg alloy nanoparticles
Shore, M. S., Wang, J. W., Johnston-Peck, A. C., Oldenburg, A. L., & Tracy, J. B. (2011), Small (Weinheim An Der Bergstrasse, Germany), 7(2), 230–234.
Size-dependent nanoscale Kirkendall effect during the oxidation of nickel nanoparticles
Railsback, J. G., Johnston-Peck, A. C., Wang, J. W., & Tracy, J. B. (2010), ACS Nano, 4(4), 1913–1920.
Nickel phosphide nanoparticles with hollow, solid, and amorphous structures
Wang, J. W., Johnston-Peck, A. C., & Tracy, J. B. (2009), Chemistry of Materials, 21(19), 4462–4467. https://doi.org/10.1021/cm901073k
Synthesis and structural and magnetic characterization of Ni(Core)/NiO(Shell) nanoparticles
Johnston-Peck, A. C., Wang, J. W., & Tracy, J. B. (2009), ACS Nano, 3(5), 1077–1084. https://doi.org/10.1021/nn900019x

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