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The modifications of Poly(3-Hexylthiophene) (P3HT) thin films have been investigated by irradiating with 90 MeV Ni7+ ions at different fluences (1 × 109 to 1 × 1011 ions/cm2). Thin films have been characterized by micro-Raman Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), UV-visible absorption Spectroscopy, Photoluminescence...
The effect of energy deposition in fullerene C70 (∼150 nm) thin film deposited by resistive heating method on glass, quartz and silicon substrates was investigated. The samples were irradiated with 90 MeV Ni ion beam at the fluences ranging from 1 × 1012 to 3 × 1013 ions/cm2. The pristine and Ni ion irradiated samples were examined for morphological and optical changes by Scanning Electron Microscopy...
The Rhodamine 6G (R6G) dye sample synthesized by thermal evaporation method is irradiated by 120 MeV Ag +9 ions at different fluences from 1 × 10 11 ion/cm 2 to 3 × 10 12 ion/cm 2 . These samples are characterized by X-ray diffraction (XRD), ultraviolet–visible (UV–Vis) absorption spectroscopy and photo-conductivity measurements. In XRD, it is observed that...
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...
Silver–silica (with Ag 2.8 at.% and 8.7 at.%) nanocomposite (NC) thin films doped with Er +3 (0.1–0.9 at.%) were synthesized by atom beam co-sputtering using 1.5 keV Ar atoms. Optical absorption and photoluminescence (PL) studies of pristine and annealed films were performed, together with Rutherford backscattering and secondary ion mass spectroscopy studies for elemental characterization...
Ni:SiO 2 granular films have been prepared by atom beam sputtering technique under ambient conditions. These films have been subsequently annealed at 200–600°C temperature. GAXRD and TEM analyses show the growth of Ni particles and improvement in crystallinity with increase in annealing temperature. Selected area electron diffraction and XPS analyses show the presence of a small quantity of...
We have investigated interfacial chemistry in a 100nm Ni on PTFE (polytetrafluoroethylene) bilayer system induced by 120MeV Au ions with fluences varying from 1×10 12 to 5×10 13 ions/cm 2 . In-situ quadrupole mass analysis (QMA) shows emission of Fluorine (F) and different fluorocarbons (C x F y ) such as CF, CF 3 , C 2 F 3 etc. during...
The irradiation effect in Ni 3 N/Si bilayers induced by 100MeV Au ions at fluence 1.5×10 14 ions/cm 2 was investigated at room temperature. Grazing incidence X-ray diffraction determined the formation of Ni 2 Si and Si 3 N 4 phases at the interface. The roughness of the thin film was measured by atomic force microscopy. X-ray reflectivity was used to...
Silicon oxynitride (Si x O y N z ) buried insulating layers were synthesized by dual implantation of nitrogen ( 14 N + ) and oxygen ( 16 O + ) ions sequentially into single crystal silicon in the ratio 1:1 at 150keV to ion-fluences ranging from 1×10 17 to 5×10 17 cm −2 . Heavy ion elastic recoil analysis (HI-ERDA) studies...
Silicon oxynitride (Si x O y N z ) buried insulating layers were synthesized by implantation of nitrogen ( 14 N + ) and oxygen ( 16 O + ) ions sequentially in the ratio 1:1 at 150keV to ion-fluences ranging from 1×10 17 to 5×10 17 cm −2 to prepare silicon on insulator (SOI) structures. The as implanted samples were held...
Spray pyrolysis deposited indium-tin oxide (ITO) thin films were fabricated and irradiated using Au 8+ swift heavy ions (SHI) (100MeV energy), at different fluency doses ranging between 1×10 11 ions/cm 2 and 1×10 13 ions/cm 2 . After irradiation, significant changes have been observed in surface morphology and crystallographic structure pertaining to increase...
Polyaniline thin films prepared by RF plasma polymerisation were irradiated with 92MeV Si ions for various fluences of 1×10 11 , 1×10 12 and 1×10 13 ions/cm 2 . FTIR and UV–vis–NIR measurements were carried out on the pristine and Si ion irradiated polyaniline thin films for structural evaluation and optical band gap determination. The effect of swift heavy ions on...
The track-etched polymeric membranes have higher permeability for hydrogen as well as carbon dioxide. In present work, we have deposited thin film of Ti having thickness 100–150nm on polymer membrane surface using vacuum evaporation method under 10 −6 Torr for filling the tracks by the Ti metal. The gas permeability of Ti-deposited membrane is modified because Ti has close affinity for hydrogen...
A systematic study was carried out to characterize the effects of argon atomic beam irradiation and low-energy argon ions in plasma for polystyrene (PS) surface modification. The PS samples were exposed to a 1.5keV, argon atomic beam from a fast atomic source (FAS) at different exposure times. The low-energy (1.5eV) argon plasma ions were achieved in a two-stage RF discharge and PS samples were exposed...
The polymer blends of Polymethyl Methacrylate/Polystyrene (PS/PMMA) have been irradiated with 28 Si ions of 60 MeV. The percentage transmission of light in the wavelength region of 490 nm has been studied with varying concentration of PS in blend films before and after irradiation. The transmission of light increased on irradiation which may be attributed to the chain scissions of PMMA.
Heavy ions with energies of a few tens of MeV and higher available at NSC Pelletron have applications in materials characterization and modifications. Nuclear techniques have been exploited for materials analysis by elastic recoil detection analysis (ERDA). High energy heavy ions and gaseous ionization chamber based telescope detector or Bragg curve spectrometer adds to the strength of ERD technique...
The technique of elastic recoil detection analysis was used to study hydrogen absorption by a non-evaporable getter (NEG) material st 707, an alloy of Zr, V and Fe. The depth distribution and intake of hydrogen in the samples activated at different heating temperatures showed that the hydrogen intake was optimum at about 300°C and tended to fall at higher temperatures from desorption. The maximum...
Two new organic nonlinear single crystals viz., Methyl hydroxy benzoate (MHB) and p-hydroxy Acetophenone (HAP) are irradiated with swift heavy ions Ag 100 MeV and Si 50-100 MeV, from the 15 UD pelletron at NSC Delhi. Hydrogen depth profiling was carried out by using ERDA technique. The effect of irradiation on the dielectric, nonlinear optical properties have been investigated. A dramatic increase...
The total secondary electron yields Y were measured for 100 MeV Si 7+ ions on Be, Al, Si, Ni, Ag and Au as a function of the incident angle of projectile ranging from 0° to 65°. In order to compare the angular dependence of the electron yield for Si 7+ ions using different targets, the experimental curves were fitted by the empirical relation of the form Y(θ) = Y(0)(cosθ)...
Pd/p-Si and Pd/n-Si devices were irradiated from 100 MeV gold (7+) ions for varying doses (∼ 10 11 -10 13 ions cm -2 ). The devices were characterized from I-V and C-V studies. It has been found that there is a change of conductivity type i.e. from n to p at a probed depth of ∼ 8 μm which is approximately the stopping range of the gold ions in silicon. A deep...
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