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Surface activity of thermally evaporated amorphous chalcogenide films of Ge 2 Sb 2 Te 5 has been investigated. Silver (Ag) is readily deposited on such films from appropriate aqueous ionic solution and Ag diffuses into the films upon irradiation with energetic photons. The composition of Ge 2 Sb 2 Te 5 thin films and the amount of Ag photo-diffused has...
The samples of polycarbonate were implanted to 100keV Ar + ions at fluences ranging from 1×10 15 to 2×10 16 ions/cm 2 . The effect of ion implantation on DC conductivity and optical behaviour of this polymer has been investigated. The observed changes have been correlated with the induced structural changes in the implanted layer using Raman spectroscopy. The increase...
In the present work, we have studied the nano/micro-patterning of the surface of NiO thin films on different substrates (SiO 2 , Si and Al) using 100 MeV Ag ions at LN 2 temperature and at an incidence angle of 75 ° with the beam axis. The surface morphology of the irradiated surface is observed by Atomic force microscopy (AFM). AFM images of ion beam irradiated samples show...
In this paper, aluminium macro powders in the size range between 300 and 500μm are processed by thermal plasma processing. A 40kW DC non-transferred DC plasma spray torch was used to get the macro powders. The morphology and the size of the powders are discussed and the results are reported. The powders produced are doughnut shaped. The size ranges between 300 and 500μm. The macro particle size is...
The present paper reports the d.c. conductivity measurements at high electric fields in vacuum-evaporated thin films of amorphous Se 80 Te 20 , Se 75 Te 20 Ge 5 and Se 75 Te 20 Sb 5 systems. Current-voltage (I-V) characteristics have been measured at various fixed temperatures. In all the samples, at low...
Surface modification and characterization are being undertaken increasingly using the MeV heavy ion beams. Interpretation of such data requires reliable and precise values of stopping powers involved. Sufficient data exists above 2.5 MeV/n but less information is available at lower energies. The present series of experiments report the results of stopping power measurements for various ion species...
Diamond like carbon (DLC) films have been produced using dc glow discharge decomposition of acetylene. Information on hydrogen content and its bonding in the films has been obtained using elastic recoil detection analysis, infrared spectroscopy and mass resolved thermal effusion measurements. DLC films having high hardness show a low hydrogen content and higher thermal stability.
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