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CVD Diamond
摘要： Diamond has the most extreme properties in mechanical, chemical and physical domain. There are many methods to manufacture synthetic diamond. Diamond layers can be deposited on various materials by many processes. The most robust and preferred method is chemical vapour deposition. A variety of researches have been performed on CVD coatings, and a range of developments has come forth starting from initial publications to the latest results. The process parameters of different CVD techniques have been discussed with technical limitations. Flow rate, applied power, increased pressure and temperature range are important parameters for the deposition of CVD diamond.
关键词： Plasma arrangement,Hot filament,Chemical vapor deposition
更新于2025-09-23 15:23:52
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Role of microstructure and structural disorder on tribological properties of polycrystalline diamond films
摘要： Polycrystalline diamond films with systematic change in microstructure that varies from microcrystalline to nanocrystalline structure are synthesized on Si by hot filament chemical vapor deposition. The morphology and structural properties of the grown diamond films are analyzed using field emission scanning electron microscope (FESEM), atomic force microscope (AFM), X-ray diffraction and Raman spectroscopy. The average roughness and grain size of the diamond films decrease with increase in CH4 to H2 ratio from 0.5 to 3%. Also, structural disorder in these diamond films increases with decrease in grain size as evidenced from Raman spectroscopy. The coefficient of friction (CoF) is found to be very low for all the films. However, the average CoF is found to increase from 0.011 ± 0.005 to 0.03 ± 0.015 as the grain size decrease from ～1 μm down to ～20 nm. Post analysis of wear track by FESEM, AFM based nanoscale friction and Raman spectroscopy reveal that microcrystalline diamond undergoes shear induced amorphization with negligible wear rate while nanocrystalline diamond films undergo shear induced plastic deformation without amorphization. A comprehensive mechanism for the observed CoF is discussed in the framework of microstructure, structural disorder and shear induced tribo-chemical reactions at the sliding interface.
关键词： Raman spectroscopy,Tribology,Diamond,Scanning electron microscopy,Hot filament CVD,Atomic force microscopy
更新于2025-09-23 15:21:01
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Controlled Growth of Silver Nanoparticles on Indium Tin Oxide Substrates by Plasma-Assisted Hot-Filament Evaporation: Physical Properties, Composition, and Electronic Structure
摘要： High-density silver (Ag) nanoparticles of controllable size and uniformity were used to enhance conductivity and luminance efficiency in an organic light emitting diode device. As part of this experiment, Ag nanoparticles were deposited on indium tin oxide (ITO) substrates by using plasma-assisted hot-filament evaporation. These nanoparticles mainly exhibited spherical grain morphology, with average diameters ranging between 7.5 and 45.7 nm depending on substrate temperature; the size of Ag nanoparticles are known to increase with rises in substrate temperatures up to 250°C, a phenomenon attributable to thermally induced surface diffusion. With regards to the optical spectra, the characteristics of the localised surface plasmon resonance were directly affected by changes in the physical properties of the Ag nanoparticles, such as diameter and interparticle distance. The X-ray photoemission spectroscopy results revealed the formation of a shell layer of silver oxide on the Ag nanoparticles. This resulted in a significant effect on the optical and electrical properties of the Ag nanoparticles/ITO. The highest density of Ag nanoparticles deposited at 80°C were associated with the lowest sheet resistance and work function at 7.45 Ohm/square and 3.97 eV, respectively, while increases in the oxide formation significantly increased the sheet resistance and work function up to 200°C. The effects of substrate temperature on the morphology, structure, as well as optical and electrical properties of the deposited Ag nanoparticles on ITO are discussed in further detail in this report.
关键词： Substrate temperature,Silver,Surface plasmon resonance,Work function,Silver oxide,Nanoparticles,Plasma-assisted hot-filament evaporation
更新于2025-09-12 10:27:22