Structural, spectroscopic and electrical studies of nanostructured porous ZnO thin films prepared by pulsed laser deposition

Vinodkumar, R.; Navas, I.; Porsezian, K.; Ganesan, V.; Unnikrishnan, N.V.; Pillai, V. P. Mahadevan

doi:10.1016/j.saa.2013.08.090

Cited by 38 publications

(13 citation statements)

References 47 publications

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“…8 k = αλ 4π (6) where α is the absorption coefficient and λ is the wave length of light [14]. The low values of the extinction coefficient for the annealed films in the visible and near infrared region show their surface smoothness and high transmittance [23]. This indicates that the annealed films are smoother and more transparent than the deposited film at 0 h. One of the important optical parameters for ZnO thin film is its refractive index.…”

Section: Optical Propertiesmentioning

confidence: 99%

“…This indicates that the annealed films are smoother and more transparent than the deposited film at 0 h. One of the important optical parameters for ZnO thin film is its refractive index. The refractive index is closely related to the electronic polarizability of ions and the local field inside the material [23]. The refractive index (n) can be calculated according to the following relation and is shown in Fig.…”

Section: Optical Propertiesmentioning

confidence: 99%

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Optical Properties of Annealed ZnO Thin Films Fabricated by Pulsed Laser Deposition

Al-Assiri

Mostafa

Ali

et al. 2015

Silicon

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The annealing effects on the structural and optical properties of grown ZnO thin films fabricated by pulsed laser deposition were investigated by using different techniques. The XRD reveals the presence of hexagonal wurtzite structure of ZnO with preferred orientation (002). The average grain size (D) of annealed ZnO nanocrystalline thin films is found to be in the range 7.77-15.91 nm. SEM of the thin film consisted of many grains distributed uniformly throughout the surface. TEM shows a relatively smooth surface with an average nanocrystalline size of 13 nm in close agreement with the XRD result. The transmittance spectra demonstrate the highly transparent nature of the films in the visible region (>70 %). The calculation of optical band gap energy (E g ) is found to be in the range 2.95-3.23 eV. The PL spectra show that the amorphous film gives a UV emission only and the annealed nanocrystalline films produce UV, violet, blue and green emissions which indicate that the point defects increased as the amorphous film was annealed. It is concluded that the structural, optical and emission properties of ZnO films grown on glass substrates by PLD strongly depend on the annealing times. The results demonstrate that these annealed films are promising materials for optical component applications.

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Section: Optical Propertiesmentioning

confidence: 99%

Section: Optical Propertiesmentioning

confidence: 99%

Optical Properties of Annealed ZnO Thin Films Fabricated by Pulsed Laser Deposition

Al-Assiri

Mostafa

Ali

et al. 2015

Silicon

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“…Several works highlighted the importance in using specific oxygen background gas pressures during ablation of the material source, if a porous structure want to be pursued [44][45][46][47]. For example, dense and porous ZnO thin films were obtained at room temperature on silicon (Si) substrates in vacuum and in 100 mTorr O 2 , respectively.…”

Section: Pulsed Laser Depositionmentioning

confidence: 99%

Porous Zinc Oxide Thin Films: Synthesis Approaches and Applications

Laurenti

Cauda

2018

Coatings

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Zinc oxide (ZnO) thin films have been widely investigated due to their multifunctional properties, i.e., catalytic, semiconducting and optical. They have found practical use in a wide number of application fields. However, the presence of a compact micro/nanostructure has often limited the resulting material properties. Moreover, with the advent of low-dimensional ZnO nanostructures featuring unique physical and chemical properties, the interest in studying ZnO thin films diminished more and more. Therefore, the possibility to combine at the same time the advantages of thin-film based synthesis technologies together with a high surface area and a porous structure might represent a powerful solution to prepare ZnO thin films with unprecedented physical and chemical characteristics that may find use in novel application fields. Within this scope, this review offers an overview on the most successful synthesis methods that are able to produce ZnO thin films with both framework and textural porosities. Moreover, we discuss the related applications, mainly focused on photocatalytic degradation of dyes, gas sensor fabrication and photoanodes for dye-sensitized solar cells.

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“…The crystallite size (D hkl ) of synthesized gyrolite was calculated from the line broadening using Scherrer's equation [37]: where λ is the wavelength of the Cu Kα radiation (0.154056 nm), θ is the Bragg's diffraction angle, B hkl is the full width at half maximum intensity of the gyrolite (001) reflection peak 2θ~3.95˚, and k is a constant (the value used in this study was 0.94). It was found that by prolonging the synthesis time up to 168 h the crystallite size and diffraction peak area (001) of gyrolite increase to 95 nm and 39 a.u., respectively ( Fig.…”

Section: Gyrolite Hydrothermal Synthesismentioning

confidence: 99%

The effect of gyrolite structure properties on Zn²⁺ion adsorption

Iljina¹,

Baltakys

Eisinas

2014

Desalination and Water Treatment

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A B S T R A C TThe effect of gyrolite structure properties on Zn 2+ ion adsorption in an alkaline solution was determined. Gyrolite was synthesized for 32, 48, 72, 120, and 168 h at 200˚C from a stoichiometric composition (molar ratio of C/S = 0.66) of the initial CaO and SiO 2 ·nH 2 O mixtures. It was established that gyrolite does not regroup into related compounds, when the hydrothermal synthesis duration was varied from 32 to 168 h, although its structure changed as the duration of the synthesis was prolonged. Also, the adsorption capacity of gyrolite for Zn 2+ ions depends on the structural properties of the adsorbent. By prolonging the duration of synthesis from 32 h to 168 h, the adsorption capacity of gyrolite decreased from 99% (29.92 mg Zn 2+ /g) to 93% (27.91 mg Zn 2+ /g). It was found that the adsorption reactions are not reversible processes, and follow by a pseudo-second-order model. X-ray diffraction analysis showed that the crystal structure of gyrolite remained stable after the adsorption processes.

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Structural, spectroscopic and electrical studies of nanostructured porous ZnO thin films prepared by pulsed laser deposition

Cited by 38 publications

References 47 publications

Optical Properties of Annealed ZnO Thin Films Fabricated by Pulsed Laser Deposition

Optical Properties of Annealed ZnO Thin Films Fabricated by Pulsed Laser Deposition

Porous Zinc Oxide Thin Films: Synthesis Approaches and Applications

The effect of gyrolite structure properties on Zn²⁺ion adsorption

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Structural, spectroscopic and electrical studies of nanostructured porous ZnO thin films prepared by pulsed laser deposition

Cited by 38 publications

References 47 publications

Optical Properties of Annealed ZnO Thin Films Fabricated by Pulsed Laser Deposition

Optical Properties of Annealed ZnO Thin Films Fabricated by Pulsed Laser Deposition

Porous Zinc Oxide Thin Films: Synthesis Approaches and Applications

The effect of gyrolite structure properties on Zn2+ion adsorption

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Product

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The effect of gyrolite structure properties on Zn²⁺ion adsorption