Structural, optical and electrical properties of N-doped ZnO thin films prepared by thermal oxidation of pulsed filtered cathodic vacuum arc deposited ZnxNy films

Erdogan, N.H.; Kara, Kamuran; Ozdamar, H.; Kavak, Hamide; Esen, Ramazan; Karaağaç, Hakan

doi:10.1016/j.jallcom.2011.06.048

Cited by 14 publications

(9 citation statements)

References 38 publications

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“…3(a)) consisted of two peaks at binding energies of 530.3 and 531.8 eV, which were assigned to typical wurtzite ZnO and OH groups, respectively. [13][14][15][16][17][18] The inset shows the OH group ratios in the O 1s spectrum at escape angles of 45…”

Section: Resultsmentioning

confidence: 99%

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Effects of Thermal Pressing on ZnO Nanoparticle Layers Deposited by Drop Casting

Yoshida

Shinohara

Itohara

et al. 2016

e-J. Surf. Sci. Nanotech.

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ZnO nanoparticle (NP) layers were formed using a simple drop casting process. Applying thermal pressing clearly improved the surface morphology and electrical properties of the as-deposited ZnO NP layers as well as significantly enhanced the transistor characteristics of the NP layers. The effects of thermal pressing on the film surface properties were evaluated by X-ray photoelectron spectroscopy, Kelvin probe microscopy, and photoluminescence spectroscopy. Results suggest that thermal pressing improved the transistor characteristics by decreasing NP surface defects such as oxygen vacancies.

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Section: Resultsmentioning

confidence: 99%

“…3(b)) and is in agreement with previous reports. [13,15,[17][18][19] The proportions of chemical components including the OH group ratios did not change after thermal pressing (Figs. 3(c) and 3(d)); however, the O 1s (ZnO) and Zn 2p 3/2 peak positions shifted to higher energies by 0.15 eV.…”

Section: Resultsmentioning

confidence: 99%

Effects of Thermal Pressing on ZnO Nanoparticle Layers Deposited by Drop Casting

Yoshida

Shinohara

Itohara

et al. 2016

e-J. Surf. Sci. Nanotech.

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“…On the other hand, the increase of photoactivity in the visible range can be rationalized with the mechanism described in Figure 8b. Where plasmon resonance under visible radiation produces on the silver nanostructures a promotion of charge carriers [43][44][45][46], adding the fact that the Schottky interfacial barrier would prevent the transfer of an electron from the surface of the silver nanostructure to the semiconductor. However, it has been shown that electrons are still able to be transferred back from the Ag to the ZnO:N due to the strong collective oscillation of electrons under the plasmon excitation [47][48][49].…”

Section: Samplementioning

confidence: 99%

“…Supplementary Materials: The following are available online at http://www.mdpi.com/2079-6412/9/11/767/s1, Figure S1: (a) Photocatalytic reactor system and (b) emission spectra of the 300 W OSRAM Ultravitalux lamp, Figure For the estimation of the optical gap of ZnO, E g , we considered direct transitions, for which around E g the absorption coefficient, α, can be expressed as [46].…”

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confidence: 99%

ZnO (Ag-N) Nanorods Films Optimized for Photocatalytic Water Purification

et al. 2019

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ZnO nanorods (NRs) films, nitrogen-doped (ZnO:N), and ZnO doped with nitrogen and decorated with silver nanostructures (ZnO:N-Ag) NRs films were vertically supported on undoped and N doped ZnO seed layers by a wet chemical method. The obtained films were characterized structurally by X-ray diffraction. Morphological and elemental analysis was performed by scanning electron microscopy, including an energy dispersive X-ray spectroscopy facility and their optical properties by Ultraviolet-Visible Spectroscopy. Analysis performed in the NRs films showed that the nitrogen content in the seed layer strongly affected their structure and morphology. The mean diameter of ZnO NRs ranged from 70 to 190 nm. As the nitrogen content in the seed layer increased, the mean diameter of ZnO:N NRs increased from 132 to 250 nm and the diameter dispersion decreased. This diameter increase occurs simultaneously with the incorporation of nitrogen into the ZnO crystal lattice and the increase in the volume of the unit cell, calculated using the X-ray diffraction patterns and confirmed by a slight shift in the XRD angle. The diffractograms indicated that the NRs have a hexagonal wurtzite structure, with preferential growth direction along the c axis. The SEM images confirmed the presence of metallic silver in the form of nanoparticles dispersed on the NRs films. Finally, the degradation of methyl orange (MO) in an aqueous solution was studied by UV-vis irradiation of NRs films contained in the bulk of aqueous MO solutions. We found a significant enhancement of the photocatalytic degradation efficiency, with ZnO:N-Ag NRs film being more efficient than ZnO:N NRs film, and the latter better than the ZnO NRs film.

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“…19 In this regard, N doping has been also applied to ZnO with the expectation of improving the light absorption property of ZnO in the visible region. [20][21][22][23][24][25][26][27][28] However, most efforts on N-doped ZnO have been focused on N-ZnO films and their photoelectrochemical performance under applied bias, [21][22][23][24][25] while there are only a few reports on the N-ZnO powders which are more favorable for direct applications in simple particulate aqueous systems. [26][27][28] More importantly, compared to the extensively studied nitrogen-doped TiO 2 however, nitrogen-doped ZnO as a photocatalyst is less intensively investigated largely due to the difficulty of realizing substitutional nitrogen doping in ZnO by the commonly developed synthesis routes.…”

Section: Introductionmentioning

confidence: 99%

A facile method for synthesis of N-doped ZnO mesoporous nanospheres and enhanced photocatalytic activity

Zhang

Gong

et al. 2013

Dalton Trans.

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A facile synthesis route is reported for preparation of N-doped mesoporous ZnO nanospheres by a solvothermal treatment of Zn(NO3)2·6H2O which provides a source of both zinc and nitrogen. A variety of different spectroscopic and analytical techniques, such as powder X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-vis and X-ray photoelectron (XPS) spectroscopies were used to characterize the physicochemical properties of catalysts. The photocatalytic activities of the composites were evaluated by the degree of degradation of rhodamine B in aqueous solutions at room temperature with near-UV light irradiation. These nanocomposites exhibit higher photocatalytic activity compared with pure ZnO nanoparticles. The enhancement of photocatalytic activity of N-doped ZnO nanoparticles is mainly attributed to their absorption of more photons and reduced electron-hole pair recombination. Our one-step, environmentally friendly synthetic method may provide a new means of designing and synthesizing series of N-doped metal oxide semiconductors for use in photo-assisted catalytic reactions.

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Structural, optical and electrical properties of N-doped ZnO thin films prepared by thermal oxidation of pulsed filtered cathodic vacuum arc deposited ZnxNy films

Cited by 14 publications

References 38 publications

Effects of Thermal Pressing on ZnO Nanoparticle Layers Deposited by Drop Casting

Effects of Thermal Pressing on ZnO Nanoparticle Layers Deposited by Drop Casting

ZnO (Ag-N) Nanorods Films Optimized for Photocatalytic Water Purification

A facile method for synthesis of N-doped ZnO mesoporous nanospheres and enhanced photocatalytic activity

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