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Nano-indentation of Graphene Sheet using Molecular Dynamic Simulation

Nano-indentation of Graphene Sheet using Molecular Dynamic Simulation. Roy Downs University of Arkansas Faculty Mentor: Joe Rencis Graduate Student Mentor: Sachin Terdalkar. Graphene Sheet. Monolayer Structure of Carbon Atoms Hexagonal Shape Lattice Characteristics Very Strong

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Nano-indentation of Graphene Sheet using Molecular Dynamic Simulation

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  1. Nano-indentation of Graphene Sheet using Molecular Dynamic Simulation Roy Downs University of Arkansas Faculty Mentor: Joe Rencis Graduate Student Mentor: Sachin Terdalkar

  2. Graphene Sheet • Monolayer Structure of Carbon Atoms • Hexagonal Shape Lattice • Characteristics • Very Strong • Highly Conductive • High Opacity http://en.wikipedia.org/wiki/File:Graphene_xyz.jpg

  3. Potential Applications • Nano-scale Electronics • Ultracapacitors • Pressure Sensors • Nano Resonators Graphene Transistor [Freitag, M., Nature Nanotechnology 2008]

  4. Experimental Measurement of Mechanical Properties • Mechanical Properties: Project Focus • Young’s Modulus (measured E=1.0 TPa) • Intrinsic Strength (measured sint=130 GPa) Graphene Sheet Silicon Substrate Silicon Substrate Graphene Sheet Graphene on Silicon Substrate Atomic Force Microscope (AFM) http://www.sciencemag.org/ http://www3.physik.uni-greifswald.de/method/afm/eafm.htm

  5. Load – Indentation Curve d Graphene Sheet & AFM Indenter http://www.physorg.com/news135959004.html http://www.sciencemag.org/

  6. Molecular Dynamics Simulation • Atoms are assumed lumped point masses • Interaction through Inter-atomic Potential • Atomic position from numerical integration of equations of motion http://en.wikipedia.org/wiki/File:Argon_dimer_potential_and_Lennard-Jones.png F = ma

  7. Goals • Using MD Simulations • Generate load-indentation curve • Determine Young’s Modulus • Calculate Intrinsic Strength • Determine Interaction Between Si Substrate and Graphene Sheet Using MD Simulations http://www.physorg.com/news135959004.html Silicon Substrate Graphene Sheet http://www.sciencemag.org/

  8. Questions?

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