A. Dianat

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The growth of single and multilayer graphene nanoflakes on MgO and ZrO 2 at low temperatures is shown through transmission electron microscopy. The graphene nanoflakes are ubiquitously anchored at step edges on MgO ͑100͒ surfaces. Density functional theory investigations on MgO ͑100͒ indicate C 2 H 2 decomposition and carbon adsorption at step-edges. Hence,(More)
The mechanical properties of graphene nanoribbons on Ni(111) surfaces with different contact sizes are investigated by means of density functional theory. For finite contact sizes, the stress behavior of graphene nanoribbons on metal electrodes is likely to be similar to that of suspended graphene, however the critical strain is not reached due to the(More)
Here we present electrochemically grown ultrathin platinum nanowires and demonstrate that their morphology and crystalline structure can be tuned by the waveform of the alternating voltage applied to the microelectrodes. The structure of the nanowires was analyzed by scanning and transmission electron microscopy. The voltage signal, applied to grow the(More)
—In this paper a test method for capacitive Micro-Electro-Mechanical Systems (MEMS) is presented. The proposed method utilizes the principle of resonant circuits to detect structural defects of capacitive MEMS devices. It is shown that a small variation of MEMS capacitance due to a defect alters the resonance frequency considerably. It is also shown that(More)
This thesis consist of two parts, post-Newtonian modes of relativistic systems and the stability curve of r-modes of neutron stars. In part I, we use the post-Newtonian (pn) order of Liouville's equation to study the normal modes of oscillation of a spherically symmetric relativistic system. Perturbations that are neutral in Newtonian approximation develop(More)
The segregation behavior of the bimetallic alloys PtPd and CoCr in the case of bare surfaces and in the presence of an oxygen ad-layer has been studied by means of first-principles modeling based on density-functional theory (DFT). For both systems, change of the d-band filling due to charge transfer between the alloy components, resulting in a shift of the(More)
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