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Effect of Metallic Interfacial Layers on the Properties of Diamond-Like Carbon Thin Films
Neeraj Dwivedi,Sushil Kumar,Sreekumar C,Saurabh Dayal,C. M. S. Rauthan,O.S. Panwar 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.2
Diamond like carbon (DLC) thin films with metallic interfacial layers of aluminum and nickel-chromium (Al and Ni-Cr) were grown using a low cost hybrid technique involving a resistive heating thermal evapo-rator and radio frequency plasma enhanced chemical vapor deposition techniques. Stress, hardness, elastic modulus, bonding, phase, and electrical conductivity of these films were investigated. Introduction of interfacial Al and Ni-Cr layers in DLC led to drastic improvement of its conductivity along with a signifi-cant reduction in residual stress but with some reduction of hardness and the elastic modulus. The struc-tural and surface properties of thin films were studied using X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy techniques.
Precursor synthesis and microwave processing of nickel ferrite nanoparticles
V.K.Sankaranarayanan,C.Sreekumar 한국물리학회 2003 Current Applied Physics Vol.3 No.2, 3
Nickel based ferrites have several applications in microwave components as dense polycrystalline compacts. In this study we haveprepared nickel ferrite nanoparticles by a self-ignition reaction directly from a citrate precursor. XRD patterns and FTIR spectraconrm the formation of single phase nickel ferrite. The sample couples readily with microwaves at ambient temperatures and theresidual carbon present in the self-ignited sample could be removed in a few minutes by microwave treatment. The samples,takes place.. 2002 Elsevier Science B.V. All rights reserved.
Structural and Nano-Mechanical Properties of Nanostructured Diamond-Like Carbon Thin Films
Saurabh Dayal,Sushil Kumar,Neeraj Dwivedi,Sreekumar Chockalingam,C. M. S. Rauthan,O.S. Panwar 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.3
The effect of self bias on structural and nano-mechanical properties of nanostructured diamond-like carbon (ns-DLC) thin films is explored. These films are grown at different negative self biases ranging from −100 V to −200 V using radio frequency (13.56 MHz) plasma enhanced chemical vapor deposition technique. The generation of nanostructured morphology at room temperature in these films is confirmed by scanning electron microscopy, whereas change in microstructure produced by varying the self biases is confirmed by Raman analysis. These ns-DLC films exhibit very high hardness, which varied from 16 GPa to 31 GPa. With the help of load versus displacement curves, various other important nano-mechanical parameters such as elastic modulus, elastic recovery etc are also estimated. The nano-mechanical properties are further correlated with the Raman and SEM analyses. Owing to their versatile nano-mechanical properties, these ns-DLC films may find application as hard and protective coatings.