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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...
Multimode resonators offer new opportunities for resonant sensing with multimodality and enhanced degrees of freedom. This digest paper presents experimental measurements of multimode resonances in ‘dog-bone’-shaped resonators made by Si CMOS-MEMS processes. We have measured >18 modes which include both out-of-plane and in-plane resonances. We compare multimode results from both photo-thermal and...
We describe the first experimental investigation of pressure-dependent resonant motions in high-frequency circular drumhead resonators based on atomically-thin molybdenum disulfide (MoS2), which demonstrate attractive performance and potential for pressure sensing. Circular bilayer and trilayer MoS2 membrane resonators with diameter of ∼1.8μm are studied in the pressure range of ∼10mTorr to ∼400Torr...
The dependence of laser beam induced current (LBIC) on the junction structure of n+-on-p HgCdTe photodiode has been numerically investigated. The simulated LBIC profiles are in good agreement with the experimental data. It is found that the peak LBIC magnitude is close to a linear relationship with both junction depth and length. In addition, the shape between two peaks becomes more flat with the...
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