نتایج جستجو برای: graphitization
تعداد نتایج: 621 فیلتر نتایج به سال:
Phase change and graphitization of diamonds from the Popigai impact crater (Krasnoyarsk Territory, Siberian platform, Russia) exposed to high-pressure high-temperature (HPHT) conditions 5.5 GPa 2000–2200 °C are studied by Raman spectroscopy X-ray diffractometry (XRD). Light-color type 1, free inclusions, with 0 10 % lonsdaleite, more resistant HPHT effects than dark 2 rich in lonsdaleite graphi...
This paper investigated the wear mechanism of diamond during atomic force microscope (AFM) tip-based nanomachining Gallium Arsenide (GaAs) using molecular dynamics (MD) simulations. The elastic–plastic deformation at apex tip was observed Meanwhile, a transition from its initial cubic lattice structure sp3 hybridization to graphite sp2 revealed. Graphitization was, therefore, found be dominant ...
In the present work, we report a novel design and preparation for the mechanochemical synthesis of calcium carbide-derived carbon (CaC2-CDC) at ambient temperature. Thermodynamic calculations confirmed the possibility of calcium carbide-derived carbon formation by the reaction of calcium carbide with sulfur, iron sulfide and zinc oxide at ambient temperature. The CDCs were synthesized by the ba...
There are two current methods to process graphene electrodes over the large scale: graphitization of single crystal SiC [ 9 , 10 ] and chemical vapor deposition (CVD) on metal fi lms. [ 3 , 11 , 12 ] Specifi cally for electrodes, CVD-grown graphene has promise in producing electrodes because the fi lms have low resistance, high optical transmittance and fl exibility. [ 3 , 12 ] Several reports ...
The impressively low friction and wear of diamond in humid environments is debated to originate from either the stability of the passivated diamond surface or sliding-induced graphitization/rehybridization of carbon. We find ultralow friction and wear for ultrananocrystalline diamond surfaces even in dry environments, and observe negligible rehybridization except for a modest, submonolayer amou...
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