Hybrid nanostructured thin-films by PLD for enhanced field emission performance for radiation micro-nano dosimetry applications
Journal of Alloys and Compounds
UNESCO-UNISA AFNET in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa, PO Box 392, Pretoria, South Africa; Nanosciences African Network (NANOAFNET), Materials Research Department, IThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, Western-Cape, South Africa; MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand; PGand Research Dept of Physics, AM Jain College Affiliated to University of Madras, Chennai, India; Materials Science Group (MSG), Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam, India; Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam, India; Sree Balaji Medical College and Hospital (SBMCH), Bharath University, Chrompet Chennai, India
We report the observation of hybrid nanostructured thin-films such as diamond-like carbon (DLC) signature on the ZnO epitaxial thin-films grown onto the device silicon/quartz substrate by reactive pulsed laser deposition (r-PLD) under the argon-oxygen (Ar|O<inf>2</inf>) ambient at 573 K. Undoped and Carbon (C) doped epitaxial ZnO thin-film layer formation is revealed by the accelerator based ion-beam analysis (IBA) technique of resonant Rutherford backscattering spectrometry (RRBS), glancing-incidence X-ray diffraction (GIXRD) pattern, micro-Raman spectroscopy (μ-RS) and field-emission (F-E) studies. The RRBS and GIXRD results show the deposition of epitaxial thin-films containing C into ZnO. The μ-RS technique is a standard nondestructive tool (NDT) for the characterization of crystalline, nano-crystalline, and amorphous carbons (a-C). As grown ZnO and C-doped ZnO thin-films μ-RS result reveal the doping effect of C-impurities that appear in the form of DLC evident from Raman peaks at 1357 and 1575 cm-1 along with a wurtzite structure peak at 438 cm-1 with E<inf>2</inf>(h) phonon of ZnO. The electron transport F-E result shows the hybrid thin-films has high conductivity than the un-doped film. Fabricated hybrid nanostructured thin-films materials could be very useful for the emerging applications of micro-nano dosimetry. © 2015 Elsevier B.V.
Amorphous carbon; Argon lasers; Carbon; Carbon films; Characterization; Crystalline materials; Deposition; Diamond like carbon films; Dosimetry; Electron transport properties; Field emission; Films; Hybrid materials; Ion beams; Laser materials processing; Metallic films; Nanocrystalline materials; Nondestructive examination; Optical films; Pulsed laser deposition; Pulsed lasers; Raman spectroscopy; Rutherford backscattering spectroscopy; Semiconductor doping; Thin films; X ray diffraction; Zinc oxide; Zinc sulfide; Diamond like carbon; Glancing incidence x-ray diffractions; Laser process; Micro Raman Spectroscopy; Nanostructured thin film; Reactive pulsed laser deposition; Rutherford back-scattering spectrometry; ZnO thin film; Epitaxial growth