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We report experimental investigation of resonant responses of molybdenum disulfide (MoS2) nanomechanical resonators at different temperatures. We observe strong temperature hysteresis in measurements. By examining devices with different geometries under different air pressures, we determine that surface adsorption plays an important role in the observed temperature hysteresis. This opens new possibilities...
We report on experimental study and calibration of temperature coefficient of frequency (TCf) and laser heating effect in two-dimensional (2D) resonators, and through which, a new method for determining thermal expansion coefficient (α) in 2D crystals. We measure the resonance characteristics of the ‘drumhead’ nanomechanical resonators based on molybdenum disulfide (MoS2) using sensitive laser interferometry...
This digest paper reports on the first high-frequency nanomechanical resonators based on molybdenum disulfide (MoS2) crystalline flakes freely-suspended on microtrenches (∼13µm wide and 14µm deep) fabricated on flexible substrate, with bendability and stretchability. Through investigations of the device resonances via optical excitation and detection by ultrasensitive laser interferometry, we first...
This digest paper describes experimental demonstration of high-frequency silicon carbide (SiC) microdisk resonators operating in aquatic environments, including water and water solutions of H2O2 and NH4OH. We demonstrate, for the first time, that center-clamped circular SiC microdisks can preserve multiple robust flexural-mode resonances in water. We have observed strong multimode responses in the...
This digest paper describes an experimental exploration of parametric resonance and amplification effects in a ‘dog-bone’-shaped bulk-mode resonator, enabled by CMOS-MEMS technology, by employing electrical excitation and optical detection. In the initially very stiff bulk-mode resonators where efficient parametric pumping is challenging, we have achieved linear resonance signal amplification with...
We report on the experimental calibration of the temperature coefficient of frequency (TCf) in single crystal 6H-silicon carbide (SiC) microdisk resonators based on a smartcut technology. We vary the temperature (T) from −32ºC to 125ºC while monitoring the undriven thermomechanical multimode resonances of the devices using sensitive optical motion detection. Both torsional mode and flexural mode resonances...
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