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University of South C arolina. Silicon C arbide Laboratory. EE RESEARCH - Dr. MVS Chandrashekhar-Epitaxial Graphene for Clean Energy. Emissions Sensing , Monitoring & Controls Using SiC and Graphene. Electrochemistry of Epitaxial Graphene -Advanced functionality & Catalysis

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University of South C arolina

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University of south c arolina

University of SouthCarolina

Silicon Carbide Laboratory

EE RESEARCH - Dr. MVS Chandrashekhar-Epitaxial Graphene for Clean Energy

Emissions Sensing, Monitoring & Controls

Using SiC and Graphene

Electrochemistry of Epitaxial Graphene

-Advanced functionality & Catalysis

-Hydrogen storage, CO2 remediation

If I was an electron?

Nanoelectronics and plasmonics for

Computing & power using Graphene and SiC

“Weightless” behavior of matter

& Other Exotic Physics


University of south c arolina

University of SouthCarolina

Silicon Carbide Laboratory

Graphene

Graphane

Si-face`

RMS: 1.04nm

RMS: 1.00nm

RMS: 0.57nm

C-face

RMS: 1.62nm

RMS: 2.83nm

EE RESEARCH - Dr. MVS Chandrashekhar-Epitaxial Graphene for Clean Energy

Energy Applications of Epitaxial Graphene

Electrochemistry using epitaxially grown EG

on SiC substrates to produce advanced graphene

Compounds for electronic and optical applications

  • TUNABLE Bandgap 0-3.5eV! Post-CMOS

  • Study H2 storage-SiC substrate changes chemistry

  • Study other electrochemical reactions

Conductivity, work function and reflectivity of graphene

change in response to combustion emissions NO2, CO

  • Potential for single molecule sensitivity

  • Commercializable material platform-SiC substrates

  • Dramatically different physics than traditional materials


University of south c arolina

University of SouthCarolina

Silicon Carbide Laboratory

EE RESEARCH - Dr. MVS Chandrashekhar-Epitaxial Graphene for Clean Energy

Plasmons & Polaritons in Epitaxial Graphene on SiC for Electrically Actuated Advanced Nanophotonics

Backgate to actuate

between plasmon waveguide & detector modes

  • Scientific/Technical Impact:

  • Fundamental insight into how plasmons can be converted into an electrical current and vice-versa

    • Structure & Composition both matter.

  • EG/SiCmetamaterials approach overcomes diffraction limit of light by>10x.

  • First systematic experimental investigation of polaritons in EG/SiC, a high impact material system

  • Enable new paradigms in light generation.

  • Make practical compact plasmonic devices that currently require bulky spectrometers.

Key Insight/Innovation

  • Potential Applications:

  • >THz speed, compact computing

  • Compact plasmonic sensors

    • Bioagents, chemical agents, infrared

    • Ionizing radiation

  • Infrared and terahertz light sources

    • sensing & imaging for munitions


University of south c arolina

University of SouthCarolina

Silicon Carbide Laboratory

~2ML thick graphene

EE RESEARCH - Dr. MVS Chandrashekhar-Epitaxial Graphene for Clean Energy

Plasmonic Effects in Epitaxial Graphene

Ideal gaphene has constant conductivity per ML

i.e. reflectivity is only dependent on

thickness outside restrahlen band

Bare SiC substrate

With adsorption of emissions gases for constant thickness

reflectivity changes ~20% for 10ppm NO2

-Nonideality! Surface charged impurity scattering!

-Enables probing of the nanoscaleopto-physics of EG

Fit to theory gives

Thickness of EG

Electron scattering time

Carrier concentration in EG

Polariton in graphene

λ0= electromagnetic excitation wavelength

λSPP= surface plasmon polariton wavelength

λSPP< λ0 opens a new area of nanoscaled optoelectronics

overcomes diffraction limit


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