Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"diamond-like carbon"”.
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Electrodeposition of Diamond-like Carbon Films
Electrodeposition of diamond-like carbon (DLC) films was studied on different substrates using two different electrochemical methods. The first electrochemical method using a three-electrode system was studied to successfully deposit hydrogenated DLC films on Nickel, Copper and Brass substrates. …
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Evaluation of diamond-like carbon films for lubrication in space
… solid lubricant for space applications. However, diamond-like carbon coatings have been increasingly studied as potential candidates for preparation of wear resistant materials with low friction in vacuum conditions. This thesis describes in-vacuum investigations made on a variety of formulations …
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Nanostructured diamond-like carbon by dual pulsed laser ablation-pulsed gas feeding
Diamond-like carbon films is a metastable form of carbon containing mixture of sp3 and sp2 hybridization. In the previous decades Diamond-like carbon has been studying widely due to its unique properties resembling those of diamond. These properties exhibit the high hardness, high wear resistance, …
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A molecular dynamics study of the tribological properties of diamond like carbon
Diamond like carbon (DLC) is an attractive choice as a coating for mechanical components, because of its excellent wear resistance and very low coefficient of friction . We use molecular dynamics (MD) simulations with a reactive force field (ReaxFF) to study the friction and wear between DLC …
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Improvement of Homogeneity and Adhesion of Diamond-Like Carbon Films on Copper Substrates
Electrodeposition method is used to deposit diamond-like carbon (DLC) films on copper substrates via anodic oxidation at low temperature. These films are characterized using Raman spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy. Homogeneity of these films is …
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Investigation of Structure and Properties of Low Temperature Deposited Diamond-Like Carbon Films
… is a novel method for fabrication of diamond-like carbon (DLC) films on metal substrates. In this work, DLC was electrochemically deposited on different substrates based on an anodic oxidation cyclization of acetylene in liquid ammonia. Successfully anodic deposition was carried out …
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Towards a universal ultra-thin fluorinated diamond-like carbon coating for nanoimprint lithography imprinters
… The plasma deposition of a layer of fluorinated diamond-like carbon (F-DLC) has proven to be a successful anti-adhesion layer but in the past has required an entire diamond-like carbon (DLC) substrate. The requirement that the imprinter be made of DLC limits the imprinter processing and can limit …
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Experimental modelling of surface roughness and dynamic friction coefficient of diamond like carbon coated shafts
Companies that coat their products with DLC often have strict surface roughness and friction coefficient goals. This research investigates the surface roughness and friction coefficient properties of uncoated and DLC coated specimens in an effort to satisfy two particular requirements of the …
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Design and characterization of diamond-like carbon coated kinematic contacts for improved coupling precision and wear resistance
… to tens-of-nanometers. This paper introduces diamond-like carbon (DLC) coatings as a means to improve the repeatability of kinematic couplings. Coatings with the help of lubricants have been used in the past to improve the repeatability of kinematic couplings, but DLC coatings offer the …
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Study of PECVD Films Containing Flourine and Carbon and Diamond Like Carbon Films for Ultra Low Dielectric Constant Interlayer Dielectric Applications
… stable at 400C were deposited using tetrafluorocarbon and disilane (5% by volume in Helium) as precursors. The bulk dielectric constant (k) of the film was optimized from 2.0 / 2.2 to 1.8 / 1.91 as-deposited and after heat treatment. Films, with highly promising k-values but discarded for …
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Ultrasound Mediated Synthesis of Catalytic and Polymeric Materials
Polymer to diamond-like carbon. Synthesis of a carbon-based network polymer with an sp3 hybridized backbone which upon pyrolysis should yield a diamond-like carbon film. The rational design of an appropriate organic monomer and its polymerization to a network polymer whose weakest bond is between …
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Si-DLC coatings optimized for low wear and low friction applications.
Diamond-like carbon (DLC) has excellent properties for the use as tribological coating such as high hardness, high wear resistance and a low friction coefficient. Nanolayer systems of hydrogenated diamond-like carbon (a-C:H) and silicon doped hydrogenated diamond-like carbon (Si-DLC or a-C:H:Si) …
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Fabrication and characterization of advanced ALGaN/GaN high-electron-mobility transistors
… Chapter 4 explores the integration of a diamond-like carbon (DLC) stress liner with high intrinsic compressive stress on AlGaN/GaN MOS-HEMTs to further improve device performance. Chapter 5 reports high voltage AlGaN/GaN-on-silicon and on-sapphire MOS-HEMTs using a CMOS compatible …
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Characterization of Amorphous Carbon Films for Mask Protection during Ion Beam Bombardment
… problem, we refine a process to coat masks with diamond-like carbon (DLC) to protect them from ion bombardment. This continues the work of Wasson, Hudek, Nounu, and Abichandani, who pioneered deposition techniques to create amorphous carbon films with low initial compressive stress, which remains …
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Thin Films for the Transport of Polarized Ultracold Neutrons for Fundamental Symmetry Study
… are applied, whereas once the UCN are polarized, diamond-like carbon (DLC) films are employed. This dissertation covers the application, process developments, and characterization of these coatings. In addition a study concerning the surface finish resulting from the mechanical polishing and …
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Ion Implantation and Characterization of High Temperature and High Performance Polymers
… islands. The structure of the island looks like a "Calabash" that has a soft conducting inner-part (graphite-like-carbon) created by the electronic energy disposition and wrapped by a hard non-conducting shell (diamond-like-carbon) produced by the nuclear energy deposition process. We found …
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Synthesis and Characterization of Ag and Cu doped DLC Thin Films for Anti-microbial Applications
Diamond-like carbon (DLC) thin films have garnered significant interest for enhancing the lifespan of biomedical implants due to their excellent mechanical and tribological properties. However, high internal stresses and poor adhesion to metallic substrates limit their application. Metal doping, …
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Molecularly thin rheological and contact interfaces
… avoiding solid contact so as to protect the diamond-like carbon coating, and thus reduce wear and potential catastrophic failures. Another part of the thesis is the work on nano-tribological behavior of Hafnium-Diboride thin films. Dense, hard nanocrystalline films of HfBN and multilayer ones …
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Polarized Ultracold Neutrons: their transport in diamond guides and potential to search for physics beyond the standard model
… development of a pulsed laser deposition, diamond-like carbon coating system and materials studies of the resulting coatings. After the initial studies of the guide coating, meter"long sections of guide are tested with UCN to determine their depolarization and transport properties. The …
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Synthesis and characterisation of DLC and diamond films for gas sensing applications
Over the last decade diamond like carbon (DLC) and diamond films have been extensively studied. These studies were only focused on the synthesis and characterization of this material. DLC films have some unique properties as a semiconductor such as a high elastic modulus, high mechanical hardness, …
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