Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-03-04
Nano Lett., 2012, 12 (1), pp 198-202
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1021/nl203305q
We present a simple micromanipulation technique to transfer suspended graphene flakes onto any substrate and to assemble them with small localized gates into mechanical resonators. The mechanical motion of the graphene is detected using an electrical, radio-frequency (RF) reflection readout scheme where the time-varying graphene capacitor reflects a RF carrier at f=5-6 GHz producing modulation sidebands at f +/- fm. A mechanical resonance frequency up to fm=178 MHz is demonstrated. We find both hardening/softening Duffing effects on different samples, and obtain a critical amplitude of ~40 pm for the onset of nonlinearity in graphene mechanical resonators. Measurements of the quality factor of the mechanical resonance as a function of DC bias voltage Vdc indicate that dissipation due to motion-induced displacement currents in graphene electrode is important at high frequencies and large Vdc.
Craighead Halrod G.
Hakonen Pertti J.
Oksanen Mika
Parpia Jeevak M.
Sillanpää Mika A.
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