title: Lubricity of gold nanocrystals on graphene measured using quartz crystal microbalance.
abstract: In order to test recently predicted ballistic nanofriction (ultra-low drag and enhanced lubricity) of gold nanocrystals on graphite at high surface speeds, we use the quartz microbalance technique to measure the impact of deposition of gold nanocrystals on graphene. We analyze our measurements of changes in frequency and dissipation induced by nanocrystals using a framework developed for friction of adatoms on various surfaces. We find the lubricity of gold nanocrystals on graphene to be even higher than that predicted for the ballistic nanofriction, confirming the enhanced lubricity predicted at high surface speeds. Our complementary molecular dynamics simulations indicate that such high lubricity is due to the interaction strength between gold nanocrystals and graphene being lower than previously assumed for gold nanocrystals and graphite.
authors.affiliation: Department of Physics and NanoScience Technology Center, University of Central Florida, Orlando, FL 32816, USA.
authors.forename: M S
authors.initials: MS
authors.lastname: Lodge
authors.affiliation: School of Engineering, University of California Merced, Merced, CA 95343, USA.
authors.forename: C
authors.initials: C
authors.lastname: Tang
authors.affiliation: Department of Physics and NanoScience Technology Center, University of Central Florida, Orlando, FL 32816, USA.
authors.forename: B T
authors.initials: BT
authors.lastname: Blue
authors.affiliation: Department of Physics and California NanoSystems Institute, University of California, Los Angeles, California 90095, USA.
authors.forename: W A
authors.initials: WA
authors.lastname: Hubbard
authors.affiliation: School of Engineering, University of California Merced, Merced, CA 95343, USA.
authors.forename: A
authors.initials: A
authors.lastname: Martini
authors.affiliation: Department of Physics and NanoScience Technology Center, University of Central Florida, Orlando, FL 32816, USA.
authors.forename: B D
authors.initials: BD
authors.lastname: Dawson
authors.affiliation: Department of Physics and NanoScience Technology Center, University of Central Florida, Orlando, FL 32816, USA.
authors.forename: M
authors.initials: M
authors.lastname: Ishigami