AVS 60th International Symposium and Exhibition
    In Situ Spectroscopy and Microscopy Focus Topic Thursday Sessions
       Session IS-ThP

Paper IS-ThP2
In Situ Electrostatic and Thermal Manipulation of Suspended Graphene Membranes

Thursday, October 31, 2013, 6:00 pm, Room Hall B

Session: In Situ Microscopy and Spectroscopy Poster session
Presenter: K. Myhro, University of California, Riverside
Authors: W. Bao, University of California, Riverside
K. Myhro, University of California, Riverside
Z. Zhao, University of California, Riverside
Z. Chen, University of California, Riverside
W. Jang, University of California, Riverside
L. Jing, University of California, Riverside
F. Miao, University of California, Riverside
H. Zhang, University of California, Riverside
C. Dames, University of California, Riverside
C.N. Lau, University of California, Riverside
Correspondent: Click to Email
Graphene is nature’s thinnest elastic membrane, and its morphology has important impacts on its electrical, mechanical, and electromechanical properties. Here we report manipulation of the morphology of suspended graphene via electrostatic and thermal control. By measuring the out-of-plane deflection as a function of applied gate voltage and number of layers, we show that graphene adopts a parabolic profile at large gate voltages with inhomogeneous distribution of charge density and strain. Unclamped graphene sheets slide into the trench under tension; for doubly clamped devices, the results are well-accounted for by membrane deflection with effective Young’s modulus E = 1.1 TPa. Upon cooling to 100 K, we observe buckling-induced ripples in the central portion and large upward buckling of the free edges, which arises from graphene’s large negative thermal expansion coefficient.