VPD Group

Synthesis, Patterning and Microscopy of Nanostructures

(Supported by NSF-EECS, DOE-BES, NIH-CCNE, AFOSR-MURI, ANL, Industry)

Research 3
The advances in modern materials and phenomena often rely on innovations in synthesis, functional architecture, their characterization and localized measurements. There is growing and compelling evidence that spatially and dimensionally constrained materials (see link) will undoubted play a decisive role in advancing materials research in the next decades.

Our activities in this theme scan a considerable breadth, ranging from size- & shape-specific aqueous synthesis of colloidal nanostructures, to site- & shape-specific nanopatterning, to localized property measurements. Recently, we have combined site specific nanopatterning with DNA-mediated assembly of anisotropic nanoparticles to construct metasurfaces. In this approach, gold nanoparticles are assembled into ordered arrays via DNA hybridization events onto a gold film decorated with DNA-binding regions defined using electron beam lithography. This approach enables one to systematically tune three critical architectural parameters of the metasurfaces: (1) anisotropic metal nanoparticle shape and size, (2) the distance between nanoparticles and a metal surface, and (3) the symmetry and spacing of particles. Importantly, these parameters allow for the precise control over the optical properties of metasurfaces.

We are developing innovative synthesis approaches for magnetic nanostructures and site- & shape-specific nanopatterning for fabricating intricate materials architecture on arbitrary substrates, including insulating plastics and ceramics. Moreover, we are working on establishing the assembly rules for the templated DNA-mediated nanoparticle assembly. These nanostructures are being characterized extensively using advanced microscopy, spectroscopy and analytical techniques.

Representative Publications:

  1. Lin, Q.-Y., Li, Z., Brown, K. A., O'Brien, M. N., Ross, M. B., Zhou, Y., Butun, S., Chen, P.-C., Schatz, G.C. Dravid, V. P., Aydin, K., & Mirkin, C. A. Strong Coupling between Plasmonic Gap Modes and Photonic Lattice Modes in DNA-Assembled Gold Nanocube Arrays. Nano Letters, 15(7), 4699-4703. (2015).
  2. Chen, P.-C., Liu, G., Zhou, Y., Xie, Z., Brown, K. A., Chernyak, N., Hedrick, J. L., He, S., Xie, Z., Lin, Q.-Y., Dravid, V. P., O'Neill-Slawecki, S. A.,  & Mirkin, C. A. Tip-Directed Synthesis of Multimetallic Nanoparticles.  Journal of the American Chemical Society, 137(28), 9167-9173.(2015).
  3. Zhou, Y., Xie, Z., Brown, K. A., Park, D. J., Zhou, X., Chen, P.-C., Hirtz, M., Lin, Q.-Y., Dravid, V. P., Schatz, G. C., Zheng, Z., & Mirkin, C. A. Apertureless Cantilever-Free Pen Arrays for Scanning Photochemical Printing. Small, 11(8), 913-918, (2015). 
  4. Datta, K. K. R., De, M., Dravid, V. P., & Eswaramoorthy, M., “Amphiphilic aminoclay-RGO hybrids: a simple strategy to disperse a high concentration of RGO in water.” Nanoscale, 5(12), 5316-5320, (2013).
  5. Chou, S. S., De, M., Kim, J., Byun, S., Dykstra, C., Yu, J., Dravid, V. P., “Ligand Conjugation of Chemically Exfoliated MoS2”, Journal of the American Chemical Society, 135(12), 4584-4587, (2013).
  6. Chou, S. S., Kaehr, B., Kim, J., Foley, B. M., De, M., Hopkins, P. E., Huang, J. X., Dravid, V. P., “Chemically Exfoliated MoS2 as Near-Infrared Photothermal Agents”, Angewandte Chemie-International Edition, 52(15), 4160-4164, (2013).
  7. Wang, X., Myers, B. D., Yan, J., Shekhawat, G., Dravid, V., & Lee, P. S., “Manganese oxide micro-supercapacitors with ultra-high areal capacitance”, Nanoscale, 5(10), 4119-4122, (2013).

Links to Other Dravid Group Research Themes:

Spatially & Dimensionally Confined Structures and Assembly
Interfaces and Defect Phenomena in Advanced Materials
Synthesis, Patterning and Microscopy of Nanostructures
“Theranostic” Nanostructures: Combined Biomedical Imaging & Targeted Therapeutics
Integrated Nanosystems for Biochemical Sensing & Diagnostics
Novel Microscopy and Analysis