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View Article and Find Full Text PDFDesired modifications of surfaces at the nanoscale may be achieved using energetic ion beams. In the present work, a complete study of self-assembled ripple pattern fabrication on Si and Ge by 100 keV Ar ion beam bombardment is discussed. The irradiation was performed in the ion fluence range of ≈3 × 10 to 9 × 10 ions/cm and at an incident angle of θ ≈ 60° with respect to the surface normal.
View Article and Find Full Text PDFThe present work reports on a simple chemical vapor deposition (CVD) technique that employs alkali halide (NaCl) to synthesize high-quality few-layer MoS by reducing growth temperature from 850 to 650 °C, and its ion irradiation study for band gap modification. The Raman peak position difference of A to E of ≈24.5 cm for the synthesized MoS corresponds to a few layers (<5 monolayers) of MoS on the substrate, as also confirmed by atomic force microscopy (AFM).
View Article and Find Full Text PDFAim: The response of ionization chamber changes when used at beam quality Q which is different from beam quality Q (usually Co) that was used at the time of its calibration. Hence, one needs to apply beam quality correction factor (k) during dosimetric measurements. However, k data are unavailable for novel ion chambers in the literature.
View Article and Find Full Text PDFThe present study aims to see the enhancement in thermoelectric properties of bismuth telluride (BiTe) annealed at different temperatures (573 and 773 K) through silver (Ag) nano-inclusions (0, 2, 5, 10, 15 and 20 wt %). Transmission electron microscopy (TEM) images of Ag incorporated in BiTe annealed at 573 K shows tubular, pentagonal, trigonal, circular and hexagonal nanoparticles with sizes of 6-25 nm (for 5 wt % Ag ) and 7-30 nm (for 20 wt % Ag). Ag incorporated in BiTe annealed at 773 K shows mainly hexagonally shaped structures with particle sizes of 2-20 nm and 40-80 nm (for 5 wt % Ag) and 10-60 nm (for 20 wt % Ag).
View Article and Find Full Text PDFSci Rep
June 2017
Tailoring the surface properties by varying the chemistry and roughness could be of interest for self-cleaning applications. We demonstrate the transformation of hydrophobic ZnO Nano rod (NR) array into superhydrophobic nature by changing the local chemical state and without altering the surface roughness by swift heavy ion (SHI) irradiation. The aligned ZnO NR arrays were irradiated using 150 MeV Ag ions with different fluences from 5E10 to 3E12 ions/cm.
View Article and Find Full Text PDFWe have investigated the formation of nanoripples on the surface of germanium, Ge(100), due to the effect of 100-keV Ar (+) ion irradiation. The irradiation was carried out at different incidence angles from 0° to 75° in steps of 15° with respect to the surface normal with a fixed ion fluence of approximately 3 × 10(17) ions/cm(2). Atomic force micrographs show an increase in surface roughness from 0.
View Article and Find Full Text PDFThe development of new fabrication techniques of plasmonic nanocomposites with specific properties is an ongoing issue in the plasmonic and nanophotonics community. In this paper we report detailed investigations on the modifications of the microstructural and plasmonic properties of metal-titania nanocomposite films induced by swift heavy ions. Au-TiO2 and Ag-TiO2 nanocomposite thin films with varying metal volume fractions were deposited by co-sputtering and were subsequently irradiated by 100 MeV Ag(8+) ions at various ion fluences.
View Article and Find Full Text PDFNanoscale Res Lett
September 2014
Unlabelled: Studies on interaction of graphene with radiation are important because of nanolithographic processes in graphene-based electronic devices and for space applications. Since the electronic properties of graphene are highly sensitive to the defects and number of layers in graphene sample, it is desirable to develop tools to engineer these two parameters. We report swift heavy ion (SHI) irradiation-induced annealing and purification effects in graphene films, similar to that observed in our studies on fullerenes and carbon nanotubes (CNTs).
View Article and Find Full Text PDFPresent work reports the elongation of spherical Ni nanoparticles (NPs) parallel to each other, due to bombardment with 120 MeV Au+9 ions at a fluence of 5 × 1013 ions/cm2. The Ni NPs embedded in silica matrix have been prepared by atom beam sputtering technique and subsequent annealing. The elongation of Ni NPs due to interaction with Au+9 ions as investigated by cross-sectional transmission electron microscopy (TEM) shows a strong dependence on initial Ni particle size and is explained on the basis of thermal spike model.
View Article and Find Full Text PDFIn the present study, we report the synthesis of ZnO nanostructures using the Vapor-Liquid-Solid growth with different metal catalyst by electron beam evaporation method. As grown samples were characterized by means of Field emission scanning electron microscopy (FESEM), Raman spectroscopy and photoluminescence spectroscopy. FESEM characterization showed the formation of different type of nanostructure depending on the metal catalyst.
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