Tetard Research Group

Research

The motivation of our research is to boost the nanoscale toolbox to explore fundamental phenomena in dynamic complex systems.

The team currently focuses on three major thrusts:

  • Nanoscale subsurface imaging

    We are interested in pushing the limits of nanoscale metrology to attain quantitative subsurface imaging with sub-10nm lateral and depth resolution. In addition we are looking to understand the physical information contained in the images (i.e., density, stiffness, etc).

    Accomplishments to date

    • Demonstrated that it is possible to combine acoustic and Atomic Force Microscopy to probe nanoscale features underneath the surface nondestructively
    • Showed 3D reconstruction is possible using this approach (similar to confocal imaging)
    • Established some connections between MSAFM signals and mechanical properties of the samples

    Recent Work

    • Detect minute mechanical variations in polymers
    • Establish some connections between material properties, MSAFM modes and image contrasts

    Related Publications

    • P. Vitry, E. Bourillot, C. Plassard, Y. Lacroute, E. Calkins, L. Tetard, E.Lesniewska, Mode Synthesizing Atomic Force Microscopy for 3D reconstruction of embedded low density dielectric nanostructure, NanoResearch, 2015. DOI: 10.1007/s12274-015-0728-8
    • P. Vitry, C. Plassard, E. Bourillot, Y. Lacroute, L.Tetard and E. Lesniewska, Advances in quantitative nanoscale subsurface imaging by mode-synthesizing atomic force microscopy, Applied Physics Letters, 105 (5), 053110, 2014.
    • M. Ewald, L. Tetard, C. Elie-Caille, L. Nicod, A. Passian, E. Bourillot, E. Lesniewska. From surface to intracellular non-invasive nanoscale study of living cell impairments, Nanotechnology, 25, 295101, 2014.
    • L. Tetard, A. Passian, S. Eslami, N. Jalili, R. H. Farahi, T. Thundat. Virtual resonance and frequency difference generation by van der Waals interaction, Physics Review Letters, 106, 180801, 2011.
    • L. Tetard, A. Passian, T. Thundat. New modes for subsurface atomic force microscopy through nanomechanical coupling, Nature Nanotechnology, 5, 105-109, 2010.
    • L. Tetard, A. Passian, K. T. Venmar, R. M. Lynch, B. H. Voy, G. Shekhawat, V. P. Dravid, T. Thundat. Imaging nanoparticles in cells by nanomechanical holography, Nature Nanotechnology, 3, 501-505, 2008.
  • Light-matter interactions at the nanoscale

    We are interested in identifying materials’ unique chemical fingerprints and mapping their chemical properties with nanoscale lateral resolution to study the sub-micron structures of complex materials, or the properties of single molecules

    Accomplishments to date

    • Demonstrated that it is possible to use the nanomechanical probes synthesized by MSAFM to sensitively detect the material’s response to infrared illumination

    Recent work

    • The approach, called “Hybrid Photonic-Nanomechanical Force Microscopy (HPFM) “, is introduced in a new publication in Nature Nanotechnology
    • Y. Ding wins 2nd place at the UCF Graduate Research Forum poster competition and is awarded the Austin L. Grogan Memorial Scholarship for her work entitled “Light-matter interaction at the nanoscale using multi-frequency atomic force microscopy”, in preparation

    Recent publications

    • L. Tetard, A. Passian, R. H. Farahi, T. Thundat, B. H. Davison, Opto-nanomechanical spectroscopic material characterization, Nature Nanotechnology, 2015. DOI: 10.1038/NNANO.2015.168
    • L. Tetard, A. Passian, R. H. Farahi, B. H. Davison, T. Thundat. Optomechanical spectroscopy with broadband interferometric and quantum cascade laser sources, Optics Letters, 36, 3251-3253, 2011.
    • L. Tetard, A. Passian, R. H. Farahi, B. H. Davison, A. L. Lereu, T. Thundat. Optical and plasmonic spectroscopy with cantilever shaped materials, Journal of Physics D-Applied Physics, 44, 445102, 2011.
  • Dynamic processes

    We are interested in studying dynamic processes taking place in complex systems. Some examples:

    • Photo-induced transitions and their effect on material properties in systems such as solar cells
    • Nonlinear processes in complex systems
    • Evolution and fate of nanoparticle-based treatment in living systems

Our state-of-the-art platforms are currently being tailored to explore several systems of interest:

  • Polymer for energy sciences

    Polymer are ubiquitous, especially in applications requiring low cost implementation or need for flexible devices.

    We are interested in studying the volume properties of heterogeneous systems including photo-induced and time-dependent phenomena.

  • Plant cells and tissues

    Plants are very complex and intriguing systems. Despite their important role in our world, studying their properties at the subcellular level has been greatly overlooked.

    Possible impact of developing a better understanding of plant at the nanoscale:

    • select the best candidate for biofuel production
    • improve chemical treatments for biomass deconstruction
    • predict the effect of treatments such as pesticides or nanoparticles on our ecosystem
    • help design better treatments for diseases for sustainable agriculture

    Accomplishments to date

    • Studies of plant wall structures, their mechanical properties and chemical traits at the nanoscale

    Recent Work

    • Investigation of the nanoscale structures in various regions of plants, including pith, xylem, phloem of stems, as well as leaves or roots
    • Study the uptake and fate of nanoparticles in plants

    Related Publications

    • L. Tetard, A. Passian, R. H. Farahi, T. Thundat, B. H. Davison, Opto-nanomechanical spectroscopic material characterization, Nature Nanotechnology, 2015. DOI: 10.1038/NNANO.2015.168
    • S. Das, L. Tetard, S. Santra, MRS Proceedings1754, mrsf14-1754-qq02-05, 2015.
    • S. Das, B.P. Wolfson, L. Tetard, J. Tharkur, J. Bazata, S. Santra, Effect of N-acetyl cysteine coated CdS: Mn/ZnS quantum dots on seed germination and seedling growth of snow pea: imaging and spectroscopic studies, Environmental Science: Nano, 2015. DOI:10.1039/C4EN00198B.
    • L. Tetard, A. Passian, S. Jung, A. J. Ragauskas, B. H. Davison. Development of New Methods in Scanning Probe Microscopy for Lignocellulosic Biomass Characterization, Industrial Biotechnology, 8, 1, 2012.
    • L. Tetard, A. Passian, R. H. Farahi, B. H. Davison, S. Jung, A. J. Ragauskas, A. L. Lereu, T. Thundat. Nanometrology of delignified Populus using mode synthesizing atomic force microscopy, Nanotechnology, 22, 465702, 2011.
    • L. Tetard, A. Passian, T. Thundat. New modes for subsurface atomic force microscopy through nanomechanical coupling, Nature Nanotechnology, 5, 105-109, 2010.
    • L. Tetard, A. Passian, R. H. Farahi, U. C. Kalluri, B. H. Davison, and T. Thundat. Spectroscopy and atomic force microscopy of biomass, Ultramicroscopy, 110, 701-707, 2010.
  • 2D materials

    Engineering the properties and functionalities of 2D materials constitute a very exciting challenge in the world of materials today.

    Applications of interest:

    • Optoelectronic devices
    • Sensors
    • Catalysis

    Accomplishments to date

    • Raman and PL studies of “hybrid” 2D materials
    • Nanoscale studies of the defects using advanced AFM platform

    Recent work

    • Study Raman and PL variations related to Au nanostructures-MoS2 monolayers interaction
    • Review the potential of 2D materials for supercapacitor developments

    Related publications

    • Z. Yu, L. Tetard, L. Zhai, J. Thomas, Supercapacitor Electrode Materials: nanostructures from 0 to 3 dimensions, Energy & Environmental Science, 8, 702-730, 2015. Selected for Cover Page.
    • N. Kang, H. P. Paudel, M. N. Leuenberger, L. Tetard, S. I. Khondaker, Photoluminescence Quenching in Single-Layer MoS2 via Oxygen Plasma Treatment, The Journal of Physical Chemistry C, 118 (36), 21258-21263, 2014.
    • U. Bhanu, M. R. Islam, L.Tetard and S. Khondaker, Photoluminescence quenching in gold-MoS2 hybrid nanoflakes, Scientiflc Reports, 4, 5575, 2014.
    • M. R. Islam, N. Kang, U. Bhanu, H. P. Paudel, M. Erementchouk, L. Tetard, M. N. Leuenberger, S. I. Khondaker, Tuning the electrical property via defect engineering of single layer MoS2 by oxygen plasma, Nanoscale, 6 (17), 10033-10039, 2014.

Tetard Research Group  •  Email: Laurene.Tetard@ucf.edu  •  407-882-0128
University of Central Florida  •  NanoScience Technology Center and Physics Department