Effect of electron beam irradiation on the structure and optical properties of nickel oxide nanocubes

Abstract

This work reports the effect of electron beam (EB) irradiation on the structure and optical properties of nanocrystalline nickel oxide (NiO) cubes. NiO nanocubes were synthesized by the chemical precipitation method. The characterization was carried out by employing analytical techniques like X-ray diffraction, transmission electron microscopy, UV-visible and photoluminescence (PL) spectroscopy. The present investigation found that nonstoichiometry, defects and particle size variation caused by EB irradiation have a great influence on optical band gap, blue shift and band modification of absorption and PL spectra. Moreover, EB irradiation can result enhanced optical absorption performance and photo-activity in NiO nanocubes for optoelectronics and photo-catalytic applications. The study of International Commission on Illumination chromaticity diagram indicates that NiO can be developed as a suitable phosphor material for the application in near ultraviolet excited colour LEDs.

Heat Treatment Effect on the Phase and Morphology of NiO-BCZY Prepared by an Evaporation and Decomposition of Solution and Suspension Method

“…The third peak may also be related to decomposition of nickel carbonate to nickel oxide as reported by Sheena et al (2014). The last peak indicated the formation of oxide species of Ni.…”

Effect of ion irradiation on nanoscale TiS2systems with suppressed Titania phase

“…From the Tauc's plot (shown inset) the bandgap of the unirradiated sample (S2) was found to be 2.85 eV and the value was observed to be decrease with increase in the ion fluence. The value of the bandgaps are found to be 2.34 eV, 1.97 eV and 1.79 eV for the samples S3, S4 and S5 respectively, The decrease in the band gap of the irradiated sample may be due to the increase in the crystallite size of the samples [21]. It can be easily understood that with decrease in the band gap the transfer of electrons from the valence band to conduction band can easily take place.…”

Characterization of NiO/CoPc nanocomposite material synthesized by solvent evaporation route

“…The broad band centred at 3430 cm −1 is assigned to O-H stretching vibrations and the band at 1625 cm −1 is attributed to H-O-H bending vibration mode [19,20]. Figure 6b shows FTIR spectrum of the nanocomposite in the range 1500-700 cm −1 .…”