Effects of annealing temperature on the structural and optical properties of ZnO hexagonal pyramids

Bacaksız, Emin; Yılmaz, Şerife; Parlak, M.; Varılcı, A.; Altunbaş, M.

doi:10.1016/j.jallcom.2008.11.025

Cited by 37 publications

(27 citation statements)

References 21 publications

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“…There is also significant academic research interest in nano-systems as their properties are remarkably different from their bulk materials due to quantum confinement effect [1,2]. In quantum confinement theory, 1-dimensional confinement such as rods and wires increase carrier transport in light harvesting cells [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…ZnO nanostructures are required to have high crystalline quality for most applications. Thermal annealing is a widely used technique to improve the crystal quality, which affect the structural, optical and electrical properties by reducing defects in material [1,12]. Therefore, understanding the effects of heat treatment on the structural and optical properties of ZnO nanostructures is of interest for various technologies employing this material.…”

Section: Introductionmentioning

confidence: 99%

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Heat treatment effects on the surface morphology and optical properties of ZnO nanostructures

Sahdan

Mamat

Muhamad

et al. 2010

Phys. Status Solidi (c)

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Zinc oxide (ZnO) nanostructures have received broad attention due to its wide applications especially for thin‐film solar cells and transistors. In this paper, we report the effects of heat treatment on the structural and optical properties of ZnO nanostructures. Zinc oxide nanostructures were synthesized using thermal chemical vapour deposition (CVD) method on glass substrate. The surface morphologies which were observed by scanning electron microscope (SEM) show that ZnO nanostructures change its shape and size when the annealing temperature increases from 400 °C to 600 °C. Structural measurement using X‐ray diffraction (XRD) has shown that ZnO nanostructures have the highest crystallinity and smallest crystallite size (20 nm) when annealed at 550 °C. Furthermore, the samples were optically characterized using Photoluminescence (PL) spectrometer. The PL spectra indicate that ZnO nanostructures have the highest peak at UV wavelength when annealed at 550 °C. The mechanism of the PL properties of ZnO nanostructures is also discussed. We conclude that ZnO nanostructures deposited using thermal CVD have the optimum structural and PL properties when annealed at 550 °C. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat treatment effects on the surface morphology and optical properties of ZnO nanostructures

Sahdan

Mamat

Muhamad

et al. 2010

Phys. Status Solidi (c)

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“…When carefully investigated, the samples annealed for 0.5 h, among the others, the (101) preferential direction of ZnO peaks' orientation was the dominant one which was a bit different than other studies in which the highest intensity peak for ZnO thin films was generally (002) [23][24][25]. This diffraction peak was also the dominant one for the 8 h annealings.…”

Section: Xrd Spectramentioning

confidence: 63%

The Effects of Thermal Annealing on ZnO Thin Films Produced by Spin-Coating Method on Quartz Substrates

Ertek

Okur

2015

Int J Thermophys

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In this work, zinc oxide (ZnO) thin films on quartz substrates were fabricated using the spin-coating method. Thermal annealings from 350 • C to 1050 • C have been performed in 50 • C increments and for two annealing durations (0.5 h and 8 h). X-ray diffraction (XRD) spectra, scanning electron microscopy micrographs, and UV-Vis absorption spectra of all the samples have been elucidated from mechanical and optical points of view. It has been observed that for all annealing temperatures, the crystal phase has been obtained. After 850 • C annealings, a new crystal phase related to Zn 2 SiO 4 (willemite) has also been appeared in XRD spectra. This phase remained stable up to 1050 • C annealing together with the ZnO crystal phase. It has been found that the nano/micro rod diameters of the ZnO crystals reach to a maximum (0.4 μm) at the 700 • C annealing for both annealing durations. For 650 • C annealings, ZnO nanorods appeared to be split into two homogeneous nanorods of length of 500 μm and of width of 0.35 μm (350 nm) which was not the case for all other annealing temperatures. After 950 • C annealings, ZnO nano/micro rods started to disappear and formed homogeneous ZnO thin films.

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“…Res. 4(10), 572-578 573 synthesis [10] and thermal evaporation [11]. Since, microwave assisted synthesis is a rapid technique and also cost effective compared to other methods, this method is chosen for producing ZnO nanoparticles.…”

Section: Issn: 2320-5407mentioning

confidence: 99%

STRUCTURAL AND FREQUENCY DEPENDENT DIELECTRIC PROPERTIES OF ZnO NANOPARTICLES AND PANI / ZnO NANOCOMPOSITE BY MICROWAVE-ASSISTED SOLUTION METHOD.

Thenmozhi¹,

Venkatesan²,

Kumar³

et al. 2016

IJAR

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Zinc Oxide nanoparticles were synthesized by microwave assisted hydrothermal method using Zinc Nitrate Hexahydrate (ZnNO 3 .6H 2 O) as a starting material. Polyaniline / Zinc Oxide (PANI/ZnO) nanocomposite material was prepared by an in-situ polymerization of aniline in the presence of as-synthesized ZnO nanoparticles. The structure, morphology and functional group of the synthesized Zinc Oxide nanoparticles and PANI / ZnO nanocomposites were characterized by X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The sharp peaks in the X-ray diffraction pattern indicate that the obtained powder was ZnO and was crystalline in nature. The crystallite size of the sample were calculated from the full width at half maximum of X-Ray diffraction peaks by using Debye-Scherrer formula and were found to be 45nm. The absorption peaks in FTIR spectra of PANI / ZnO nanocomposites were slightly shifted to higher wave number than that of pure ZnO, which confirms that there was a strong interaction between polyaniline and Zinc Oxide nanoparticles. The TEM images revealed the uniform distribution of the ZnO nanoparticles in the PANI matrix. Dielectric studies of ZnO nanoparticles show the frequency dependent dielectric behaviour of ZnO nanoparticles. Results reveals that the dielectric constant decrease with the increasing frequency whereas the a.c conductivity of the sample increases with the increase in frequency.

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Effects of annealing temperature on the structural and optical properties of ZnO hexagonal pyramids

Cited by 37 publications

References 21 publications

Heat treatment effects on the surface morphology and optical properties of ZnO nanostructures

Heat treatment effects on the surface morphology and optical properties of ZnO nanostructures

The Effects of Thermal Annealing on ZnO Thin Films Produced by Spin-Coating Method on Quartz Substrates

STRUCTURAL AND FREQUENCY DEPENDENT DIELECTRIC PROPERTIES OF ZnO NANOPARTICLES AND PANI / ZnO NANOCOMPOSITE BY MICROWAVE-ASSISTED SOLUTION METHOD.

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