ZnO nanoparticles have been synthesized by precipitation method from Zinc nitrate. The powder was characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, selected-area electron diffraction, UV-vis optical absorption, and photoluminescence spectroscopy analyses. XRD patterns showed that ZnO nanoparticles have hexagonal unit cell structure. SEM and TEM pictures reveal the morphology and particle size of prepared ZnO nanoparticles. The UV-vis absorption spectrum shows an absorption band at 355 nm due to ZnO nanoparticles. The photoluminescence spectrum exhibits two emission peaks one at 392 nm corresponding to band gap excitonic emission and another located at 520 nm due to the presence of singly ionized oxygen vacancies. The synthesis method has potential for application in manufacturing units due to ease processing and more economical reagents.
The paper Presents the modeling and simulation of a highly sensitive three axis Micro Electro Mechanical Systems (MEMS) based H and T shape Capacitive Accelerometer . The MEMS Capacitive Accelerometer Sensor which both capacitance and displacement are the primary sensing characteristics. The differential capacitive accelerometer produces displacement and capacitance due to applied acceleration. The main focus of the work has to improve the displacement sensitivity by changing the diaphragm dimensions with applied input acceleration from 1g to 10g.The H and T shape accelerometers has simulated with the parameterized thickness, length, width of the proof mass for better sensitivity.
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