Woodruff School of Mechanical Engineering

Seminar

Title:

Hot n Flaky: Thermal Properties of Layered Atomic Structures

Speaker:

Dr. Christopher Muratore

Affiliation:

Department of Chemical and Materials Engineering, University of Dayton, Dayton, OH 45469

When:

Thursday, November 7, 2013 at 1:00:00 PM

Where:

Love Building, Room 109

Host:

Zhuomin Zhang
zhuomin.zhang@me.gatech.edu
4043854225

Abstract

Structure-property relationships for graphene are generally appreciated in terms of the decades-old understanding of its three dimensional (3D) analog, graphite. As 2D alternatives to graphene such as MoS2 and other compounds are studied for energy conversion and electronic device applications, our desire for increased understanding demands investigation of structure-property relationships. In this work, we explore thermal properties of MoS2 and layered compounds with different average atomic masses but equivalent microstructures. Thermal conductivity values of thin films were compared to bulk crystals, revealing expected trends with mass, but a more than 10 fold reduction in thin film thermal conductivity. Phonon scattering lengths at domain boundaries based on computationally derived group velocities were consistent with the observed film microstructure, accounting for the reduction. We also explore thermal anisotropy in MoS2 films. Measurement results are correlated with MD simulations of thermal transport for perfect and defective MoS2 crystals, demonstrating the importance of thermal boundary scattering.


Biography

Christopher Muratore received his Ph.D. in Materials Science from the Colorado School of Mines in 2002. Upon completion of his degree, he was an ASEE Postdoctoral Research Fellow in the Plasma Physics Division at the Naval Research Laboratory. He was recognized for his efforts in identifying and controlling plasma-surface interactions for etching and deposition processes at NRL by the American Vacuum Society with the Bunshah Award in 2004. He joined the Air Force Research Laboratory in 2004, where his research was focused on development of smart thin film nanocomposite materials demonstrating temperature-adaptive properties. Christopher later became Technical Lead of the Thermal Interfaces Group Branch at the Air Force Research Laboratory. His group focused on the role of surfaces and interfaces on heat transfer. He joined the University of Dayton Chemical and Materials Engineering Department in December 2012.