Synthesis and thermal stability of ZnO nanowires

Awad, M. A.; Ibrahim, E.M.M.; Ahmed, Ahmed Mohamed

doi:10.1007/s10973-014-3836-x

Cited by 20 publications

(9 citation statements)

References 33 publications

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“…[18][19][20]. The absorption band around 444 cm -1 is due to Zn-O vibration mode [20][21][22]. The FT-IR spectra of ZAD-Li and ZAD-Li,Ni samples, thermally treated at 257 o C, show similar behavior with undoped sample, as can be seen in the Figure 10.…”

Section: Samples Annealed At 275 °Cmentioning

confidence: 92%

“…In the 1010-1145 cm -1 region the observed bands are explained as the symmetric and asymmetric stretching modes of C-O bond in the acetate group. Below 686 cm -1 the bands are due to Zn-O vibration [17][18][19][20][21][22]. In the spectra of the doped samples the intensity of the Zn-OH band at 623cm -1 increased, and the bands at 502 and 420 cm -1 became more intense.…”

Section: As-prepared Gel and Powder Samplesmentioning

confidence: 99%

“…The bands in the low frequency region 429-485 cm -1 correspond to the lattice vibration mode of Zn-O [18][19][20][21][22] for doped and un-doped samples. The bands are shifted to lower wavenumbers in doped samples.…”

Section: Tablementioning

confidence: 99%

“…The bands are shifted to lower wavenumbers in doped samples. Small bands at 1507 cm -1 and 1123 cm -1 are assigned of organic adsorbed species [18][19][20][21][22]. During annealing the gels, zinc-acetate decomposed between 110-350 °C with the release of CH 3 COOH, acetone and CO 2 .…”

Section: Tablementioning

confidence: 99%

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Thermal study on the synthesis of the doped ZnO to be used in TCO films

Mihaiu

Szilágyi

Atkinson

et al. 2015

J Therm Anal Calorim

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ZnO, Li doped and Li,Ni co-doped ZnO powders to be later used as transparent conductive oxide (TCO) thin film were prepared by heat treatment of gels obtained from alcoholic Zn(CH 3 COO) 2 •2H 2 O, LiNO 3 •nH 2 O and NiSO 4 •6H 2 O solutions with (CH 3 CH 2 OH) 3 N as chelating agent. The properties of the powders and their thermal treatment were studied by thermogravimetric and termodifferential anlysis (TG/DTA), differential scanning calorimetry (DSC), evolved gas analysis coupled with mass spectroscopy (EGA-MS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy coupled with energy dispersive X-ray (SEM/ EDX). The as-prepared gels consisted of submicron platelet-like particles and contained zinc acetate dihydrate and hydrozincite in different amount and with different preferred orientations. During annealing the gels, zinc-acetate decomposed between 110-350 °C with the release of CH 3 COOH, acetone and CO 2 . The N content of the chelating agent was responsible for NH 3 and NO evolution. The thermal behavior of the doped 3 gels was similar, but there were also differences in the mass losses, amount of released gases.Based on TG/DTA data, ZnO powders were obtained from the gels by annealing both at 275 and 500 °C. After heating at 275 °C, the obtained powders consisted of spherical 1-2 micron grains of wurtzite. The inclusion of the dopants was successful according to EDX and cell parameter data. Thermal study of the powder annealed at 275 °C confirmed that they still contain some zinc acetate. In the case of the doped samples the mass loss was smaller, since the Li and Ni dopants catalized the composition of zinc acetate during the previous annealing at 275 °C. After annealing the gels at 500 °C, stable un-doped ZnO or doped ZnO particles were obtained.

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Section: Samples Annealed At 275 °Cmentioning

confidence: 92%

Section: As-prepared Gel and Powder Samplesmentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

Section: Tablementioning

confidence: 99%

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Thermal study on the synthesis of the doped ZnO to be used in TCO films

Mihaiu

Szilágyi

Atkinson

et al. 2015

J Therm Anal Calorim

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“…In addition, the UV-visible and photoluminescence spectra showed a red shift when T a was increased. Awad et al [14] synthesized ZnO nanowires (NWs) using the thermal evaporation method with vapor-liquid-solid (VLS) growth technique. They studied the effect of annealing at high temperature up to 1673 K on the structural and compositional properties as well as the morphology of the ZnO NWs.…”

Section: Introductionmentioning

confidence: 99%

Sonochemically Synthesized Zno Nanosheets and Nanorods: Thermal Annealing Effects on the Structure, Morphology, Optical Absorption and Photoluminescence

2016

Assiut University Journal of Multidisciplinary Scientific Resea

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ZnO nanopowders were successfully synthesized by ice-bath assisted sonochemical method and annealed in air for 3 h at different temperatures (T a ) range from 300 to 700 o C by step 100 o C. The effect of T a on the structural and morphological changes was investigated by x-ray diffraction (XRD) and transmission electron microscopy (TEM). Optical properties were studied by measuring the optical absorption and photoluminescence (PL) spectra. XRD analysis showed that the thermal annealing leads to an improvement in crystallinity associated with the increase of the crystallite size, as well as the increase in both of the Zn-O bond length and unit cell volume. Also, it was found that increasing T a results in a shift of the diffraction angle toward the lower values accompanied with the decrease of internal local strain. The morphological study confirms that the samples have a mixture of the nanosheets and nanorods structures. In addition, the length and diameter of the nanorods increase as a result of increasing T a . The optical absorption spectra show that the exciton peak of the asprepared sample is red shifted from 370 to 378 nm by the thermal annealing, and the optical band gap decreases from 3.45 to 3.36 eV. PL spectra were reordered at an excitation wavelength of 325 nm, and the deconvolution of the spectra reveals four emission bands; where the main UV band (at λ = 397 nm) can be attributed to exciton recombination related to near-band-edge. Furthermore, thermal annealing results in the quenching of PL intensity of the annealed samples.

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