A study of 8 MeV e-beam on localized defect states in ZnO nanostructures and its role on photoluminescence and third harmonic generation

Antony, Albin; Poornesh, P.; Kityk, I.V.; Myronchuk, G.L.; Sanjeev, Ganesh; Petwal, Vikash Chandra; Verma, Vijay Pal; Dwivedi, Jishnu

doi:10.1016/j.jlumin.2018.11.043

Cited by 29 publications

(18 citation statements)

References 63 publications

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“…ZnO has attracted the attention of many researchers for many years due to some of its properties such as wide band gap (3.30eV), high exciton binding energy (60MeV) at room temperature, stable hexagonal wurtzite structure with space group P63mc [1,2]. These features have made it desirable for several applications including photocatalysis [3], surface acoustic wave devices [4], photodetectors [5], gas sensors [6], light-emitting diodes [7,8], and solar cells [9].…”

Section: Introductionmentioning

confidence: 99%

Highly c-axis Oriented ZnO Thin Films by Sol-gel Method

Kutlu¹,

Erdogan²,

Sedefoğlu³

et al. 2021

Preprint

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This study reports the effect of annealing temperature on the structural, morphological, and optical properties of ZnO (Zinc Oxide) thin films deposited on a glass substrate by the sol-gel spin coating method. Those properties of ZnO were examined with UV-Vis, Fourier transform infrared (FTIR) and Raman spectroscopy, Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), and X-ray diffraction (XRD), before and after annealing. XRD results revealed that all the samples had a highly c-axis oriented wurtzite structure. A 1 (LO) mode in Raman spectra also confirmed the highly oriented ZnO films. Optical measurement indicated that transmittance of the films was above %85, and the optical band gap slightly decreased with the increasing annealing temperature from 350 to 550 °C. Morphological analysis displayed that increasing annealing temperature improved surface morphology and enlarged the grain size from 2-3 nm for as-deposited samples to 150 nm for annealed at 550 °C.

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Section: Introductionmentioning

confidence: 99%

Highly c-axis Oriented ZnO Thin Films by Sol-gel Method

Kutlu¹,

Erdogan²,

Sedefoğlu³

et al. 2021

Preprint

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“…Raman spectroscopy is a nondestructive tool that has been widely used for studying phonon dynamics, structure, and the phases of different materials, including nanostructured materials. [1][2][3][4][5][6][7][8] In the first-order Raman scattering process, when long-range order exists over length scales comparable with the wavelength of the incident photons, only phonons with small wave vectors (i.e., those near the Brillouin-zone center) contribute to the Raman signal, producing Stokes lines with approximately Lorentzian shape and narrow full width at half maximum (FWHM). [9,10] In the case of nanomaterials, where long-range order is reduced to submicron or nanometric dimensions, the wave vector selection rule is relaxed, allowing phonons further away from the Brillouin-zone center to contribute to the Raman signal.…”

Section: Introductionmentioning

confidence: 99%

“…[9,10,[12][13][14] Confinement effects have been observed in structurally modified single crystals and polycrystals. [5,6,[15][16][17] Ionizing radiation, for example, can produce disorder in a crystal through the introduction of defects such as ion tracks, voids, phase precipitates, and dislocations. [18,19] When disorder is introduced, the correlation length of the phonons is reduced as the wave vector selection rule is relaxed.…”

Section: Introductionmentioning

confidence: 99%

Raman characterization of phonon confinement and strain effects from latent ion tracks in α‐quartz

Toro

Crespillo

Olivares

et al. 2021

J Raman Spectroscopy

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This study reports phonon confinement and strain effects in the Raman spectrum of ion-irradiated and subsequently etched α-quartz. Y-and Z-cut α-quartz single crystals were irradiated at room temperature with 20-MeV Ni 6+ and 40-MeV I 7+ ions. Latent ion tracks were produced with areal densities ranging from the isolated track regime to the overlapping track regime (nominal fluences of 1 Â 10 9 , 1 Â 10 10 , and 1 Â 10 11 ions cm À2 ). Nanowell structures were revealed after vapor etching with hydrofluoric acid (HF) aqueous solutions. A phonon confinement model was invoked to explain the observed changes in the shape of the strong Raman peak located around 463 cm À1 .

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“…Moreover, high energies of electrons or gamma rays (more than 1-5 MeV) lead to the formation of electronic cascades in the structure, which can lead to a significant change in the electron density of nanostructures, which leads to ordering of the structure and a change in the orientation of texture planes. At the same time, when irradiated with electronic and gamma radiation, the probability of an increase in the geometric dimensions of nanostructures is extremely small, which indicates the great promise of these types of radiation for directional modification and reduction of the disequilibrium of structural parameters in nanomaterials [16][17][18][19][20]. The absence of oxidation processes as a result of phase transformations upon irradiation with electrons or gamma rays opens up wide possibilities for using these types of radiation for the directed modification of iron-nickel or iron-containing nanostructures, for which oxidation processes are accompanied by phase transformations and changes in properties [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Structural Changes and Catalytic Properties of FeNi Nanostructures as a Result of Exposure to Gamma Radiation

et al. 2020

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The paper presents the results of changes in the structural characteristics, and the degree of texturing of FeNi nanostructures close in composition to permalloy compounds as a result of directed modification by gamma radiation with an energy of 1.35 MeV and doses from 100 to 500 kGy. The choices of energy and radiation doses were due to the need to modify the structural properties, which consisted of annealing the point defects that occurred during the synthesis along the entire length of the nanotubes. The initial FeNi nanostructures were polycrystalline nanotubes of anisotropic crystallite orientation, obtained by electrochemical deposition. The study found that exposure to gamma rays led to fewer defects in the structure, and reorientation of crystallites, and at doses above 300 kGy, the presence of one selected texture direction (111) in the structure. During tests of the corrosion resistance of synthesized and modified nanostructures in a PBS solution at various temperatures, it was found that exposure to gamma rays led to a significant decrease in the rate of degradation of nanotubes and an increase in the potential life of up to 20 days. It was established that at the first stage of testing, the degradation of nanostructures is accompanied by the formation of oxide inclusions, which subsequently lead to the formation of pitting corrosion and subsequent partial or complete destruction of the nanostructures. It is shown that gamma radiation is promising not only for targeted modification of nanostructures and increasing resistance to degradation, but also for increasing the rate of catalytic reactions of the PNA-PPD type.

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A study of 8 MeV e-beam on localized defect states in ZnO nanostructures and its role on photoluminescence and third harmonic generation

Cited by 29 publications

References 63 publications

Highly c-axis Oriented ZnO Thin Films by Sol-gel Method

Highly c-axis Oriented ZnO Thin Films by Sol-gel Method

Raman characterization of phonon confinement and strain effects from latent ion tracks in α‐quartz

Investigation of the Structural Changes and Catalytic Properties of FeNi Nanostructures as a Result of Exposure to Gamma Radiation

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A study of 8 MeV e-beam on localized defect states in ZnO nanostructures and its role on photoluminescence and third harmonic generation

Cited by 29 publications

References 63 publications

Highly c-axis Oriented ZnO Thin Films by Sol-gel Method

Highly c-axis Oriented ZnO Thin Films by Sol-gel Method

Raman characterization of phonon confinement and strain effects from latent ion tracks in α‐quartz

Investigation of the Structural Changes and Catalytic Properties of FeNi Nanostructures as a Result of Exposure to Gamma Radiation

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A study of 8 MeV e-beam on localized defect states in ZnO nanostructures and its role on photoluminescence and third harmonic generation