The diameter-dependent Young's modulus, E, and quality factor, Q, of GaN nanowires were measured using electromechanical resonance analysis in a transmission electron microscope. E is close to the theoretical bulk value ( approximately 300 GPa) for a large diameter nanowire (d=84 nm) but is significantly smaller for smaller diameters. At room temperature, Q is as high as 2,800 for d=84 nm, sign...

Martensitic transformation usually creates hierarchical internal structures beyond mere change of the atomic crystal structure. Multi-stage nucleation is thus required, where nucleation (level-1) of the underlying atomic crystal lattice does not have to be immediately followed by the nucleation of higher-order superstructures (level-2 and above), such as polysynthetic laths. Using in situ trans...

Recent measurements have indicated that the elastic behaviour of silicon nanocantilevers and nanowires is size-dependent. Several theoretical models have been proposed to explain this phenomenon, mainly focused on surface stress effects. However, discrepancies are found between experiments and theories, indicating that there could be other influences in addition to surface effects. One of the i...

The polymer polyvinylidene difluoride (PVDF) has unique piezoelectric properties favorable for Micro-Electro-Mechanical Systems (MEMS) and Nano-Electro-Mechanical Systems (NEMS) applications. In the present research, we conducted nanometer-length scale characterization of this material using several high-resolution techniques. Specifically, we used an atomic force microscope (AFM) to study the ...

Administration (EIA) provides analyses used to assess proposed energy and environmental policies and to make energy forecast for the Annual Energy Outlook (AEO). The tool used by EIA for these mid to long term forecasts is the National Energy Modeling System (NEMS), a large-scale model of energy supply, demand, prices, and technologies. One component of NEMS is the Petroleum Marketing Module (P...

Abstract A comprehensive review is presented on the advances achieved in past years fundamental and applied materials science of diamond films engineering to integrate them into new generations microelectromechanical system (MEMS) nanoelectromechanical systems (NEMS). Specifically, focuses describing performed develop thin film synthesis processes characterization chemical, mechanical, tribolog...

Mechanical properties of a nanomechanical resonator significantly impact the performance resonant Nano-electromechanical system (NEMS) device. We study mechanical suspended membranes fabricated out low-pressure chemical vapor deposited silicon nitride thin films. doubly-clamped with thickness less than 50 nm and length varying from 5 to 60 μm. The elastic modulus stress in were measured using A...

The fields of micro- and nanomechanics are strongly interconnected with the development micro-electro-mechanical (MEMS) nano-electro-mechanical (NEMS) devices, their fabrication applications. This article highlights biomimetic concept designing new nanodevices for advanced materials sensing

We report the observation of self-oscillations in a bottom-up nanoelectromechanical system (NEMS) during field emission driven by a constant applied voltage. An electromechanical model is explored that explains the phenomenon and that can be directly used to develop integrated devices. In this first study, we have already achieved approximately 50% dc/ac (direct to alternating current) conversi...