Hybrid nanostructured thin-films by PLD for enhanced field emission performance for radiation micro-nano dosimetry applications

Manikandan, E.; Kennedy, J.; Kavitha, G.; Kaviyarasu, K.; Mâaza, M.; Panigrahi, B. K.; Mudali, U. Kamachi

doi:10.1016/j.jallcom.2015.06.102

Cited by 88 publications

(22 citation statements)

References 19 publications

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“…This material is also interesting because of its simple and economical photocatalytic activity. Wide-band-gap semiconductor, ZnO exhibits interesting optoelectronic properties and spintronic applications [10,11] because of its direct band-gap and large exciton binding energy (60 meV at room temperature) that can be used for UV-blue lasers and diodes [10,12]. UV and visible band emission provides useful information about the electronic properties of ZnO.…”

Section: Introductionmentioning

confidence: 99%

Capacitive properties of zinc oxide thin films by radiofrequency magnetron sputtering

Ondo-Ndong¹,

Essone-Obame²,

Moussambi³

et al. 2018

J Theor Appl Phys

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The study focused on the production of zinc oxide (ZnO) thin films as a dielectric material for use in metal-insulator-semiconductor capacitors. The objective of this study has demonstrated the frequency dependence of conductivity and capacity. Zinc oxide (ZnO) was thin films deposited by a silicon wavelength sputtering\magnetron cathode sputtering. The capacitive properties of ZnO zinc oxide were studied at room temperature. The frequency dependence of the conductivity, capacitance and the measured current-voltage (I-V) characteristics of ZnO zinc oxide thin films were studied in the frequency range from 5 kHz to 13 MHz. It is shown that the conductivity is total. Indeed, the measurement of the conductivity in alternating regime obeys the Arrhenius equation. In addition, the measured I-V characteristics of the structures studied at 10 kHz and 10 MHz clearly revealed areas of accumulation, depletion and inversion in the plots. It has been observed that AC conductivity and capacity in the ZnO thin films (ZnO) are frequency dependent. This dependence indicates that the conduction is thermally activated and maintains the correlated barrier of the charge carrier on the localized states as a function of the experimental data. The FBAR (expand) devices with the ZnO films exhibited a pronounced resonance peak centered at 537 MHz with a k 2 coupling coefficient of 7%. It found therefore that the impedance matching of the FBAR could be easily achieved simply by controlling the resonance the resonator.

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Section: Introductionmentioning

confidence: 99%

Capacitive properties of zinc oxide thin films by radiofrequency magnetron sputtering

Ondo-Ndong¹,

Essone-Obame²,

Moussambi³

et al. 2018

J Theor Appl Phys

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“…Finally, one should notice that the vibrational modes 1D and 1G as well as 2-D of the graphene initial buffer layer which are positioned at about 1341, 1589 and 2690 cm À1 respectively are not observed. This seems indicating that the initial RGO buffer layer has been modified/reacted during the laser deposition of the DLC film [28,41]. Such a physical-chemical reactivity seems to have occurred between the DLC film and the RGO only as there are no traces of any NaCl vibrational modes.…”

Section: Resultsmentioning

confidence: 95%

“…Nevertheless, as a pre-summary, one can confirm the possibility to deposit free DLC films without a high degree of stress build up by PLD onto RGO buffer layers. This could be explained by the high kinetic energies of the impinging carbon particles ablated from the target [38,41]. The diamond quality of the coatings i.e.…”

Section: Resultsmentioning

confidence: 99%

“…The high purity graphite carbon target (f 2.7 mm,~2 mm thick, Johnsson Mathey, purity 99.9) was mounted in the vacuum system with a base pressure of the order of 1.04 Â 10 À7 mbar, and irradiated with a KrF excimer laser at normal incidence (l emission ¼ 248 nm, pulse duration ¼ 25 ns, repetition rate ¼ 10 Hz). As in the case of Ho et al [26], no hydrogen gas was added during the deposition of the DLC coatings neither in the chamber nor at the substrates interface [30,31,41]. The non heated RGO coated NaCl & or mica substrates were located at a distance of typically~10 cm from the rotating carbon target surface.…”

Section: Phasementioning

confidence: 99%

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Free standing diamond-like carbon thin films by PLD for laser based electrons/protons acceleration

Thema

Beukes

Ngom

et al. 2015

Journal of Alloys and Compounds

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“…Raman spectroscopy can frequently characterize the crystalline nature, purity and defects in the different types of carbonaceous materials. Figure 7 represents the Raman spectrum of c-CNTs, in that a high peak at 1584.21 cm −1 and another peak at 1353.60 cm −1 are observed and ascribed to the Raman G (graphitized band) and D (disordered band) band, respectively (Manikandan et al 2015). More specifically, the G-band is a feature of E 2g mode associated with the vibration of sp 2 bonded crystalline carbon, whereas the D-band corresponds to A 1g mode correlate to the disorder features due to amorphous carbon and defects in the side walls.…”

Section: Characterization Of C-cntsmentioning

confidence: 99%

Large-scale synthesis of coiled-like shaped carbon nanotubes using bi-metal catalyst

et al. 2018

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Carbon nanomaterials (CNMs), especially carbon nanotubes (CNTs) with coiled structure exhibit scientifically fascinating. They may be projected as an innovative preference to future technological materials. Coiled carbon nanotubes (c-CNTs) on a large-scale were successfully synthesized with the help of bi-metal substituted α-alumina nanoparticles catalyst via chemical vapor deposition (CVD) technique. Highly spring-like carbon nanostructures were observed by field emission scanning electron microscope (FESEM) examination. Furthermore, the obtained material has high purity, which correlates the X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDX) analysis. Raman spectroscopy reveals that the carbon multi layers are well graphitized and crystalline, even if they have defects in its structure due to coiled morphology. High-resolution transmission electron microscope (HRTEM) describes internal structure and dia of the product. Ultimately, results support the activity of bi-metal impregnated α-alumina nanoparticles catalyst to determine the high yield, graphitization and internal structure of the material. We have also studied the purified c-CNTs magnetic properties at room temperature and will be an added advantage in several applications.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Hybrid nanostructured thin-films by PLD for enhanced field emission performance for radiation micro-nano dosimetry applications

Cited by 88 publications

References 19 publications

Capacitive properties of zinc oxide thin films by radiofrequency magnetron sputtering

Capacitive properties of zinc oxide thin films by radiofrequency magnetron sputtering

Free standing diamond-like carbon thin films by PLD for laser based electrons/protons acceleration

Large-scale synthesis of coiled-like shaped carbon nanotubes using bi-metal catalyst

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