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Updated: Jan 28, 2026

Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies
Published on: November 5, 2015
GHz nanomechanical resonator in an ultraclean suspended graphene p-n junction
Minkyung Jung1, Peter Rickhaus2, Simon Zihlmann3
1Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland. minkyung.jung@dgist.ac.kr Christian.Schoenenberger@unibas.ch and DGIST Research Institute, DGIST, Daegu 42988, Korea.
Abstract:
We demonstrate high-frequency mechanical resonators in ballistic graphene p-n junctions. Fully suspended graphene devices with two bottom gates exhibit ballistic bipolar behavior after current annealing. We determine the graphene mass density and built-in tension for different current annealing steps by comparing the measured mechanical resonant response to a simplified membrane model. In a graphene membrane with high built-in tension, but still of macroscopic size with dimensions 3 × 1 μm2, a record resonance frequency of 1.17 GHz is observed after the final current annealing step. We further compare the resonance response measured in the unipolar with the one in the bipolar regime. Remarkably, the resonant signals are strongly enhanced in the bipolar regime.
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