Effect of thermal annealing on properties of polycrystalline ZnO thin films

Gritsenko, L. V.; Абдуллин, Х.А.; Габдуллин, М. Т.; Kalkozova, Zh. K.; Kumekov, S. E.; Mukash, Zh. O.; Sazonov, Andrei; Теруков, Е. И.

doi:10.1016/j.jcrysgro.2016.07.026

Cited by 21 publications

(7 citation statements)

References 19 publications

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“…On the other hand, acquiring intense ultraviolet (UV) emission from ZnO is always a challenge in ZnO based UV photonics and various methods to enhance the UV emission have been reported [13][14][15][16]. REs doping of ZnO and its influence on the near band edge (NBE) emission of ZnO [17,18] were reported, and a NBE enhancement was observed but the mechanism for the enhancement is not clear.…”

Section: Introductionmentioning

confidence: 99%

Strong near band edge emission of (Ce, Yb) co-doped ZnO thin films after high temperature annealing

Heng

et al. 2017

Opt. Mater. Express

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We studied the photoluminescence (PL) properties of (Ce + Yb) co-doped ZnO thin films as a function of high temperature annealing. The films were fabricated by magnetron sputtering. After 1000-1100°C annealing, the near band edge (NBE) emissions of the films were dozens to a hundred times stronger than that of undoped ZnO, while the Yb 3+ emission (~980 nm) was quite weak, indicating that energy transfers from the ZnO host to Yb 3+ ions in the films were not efficient. X-ray diffraction analysis and scanning electron microscopy observations demonstrated that the (Ce + Yb) co-doping had a large effect on the morphology and crystallinity of the films. The crystallinity enhancement of the films is considered to be the main reason for the strong NBE enhancements of the co-doped ZnO films.

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Section: Introductionmentioning

confidence: 99%

Strong near band edge emission of (Ce, Yb) co-doped ZnO thin films after high temperature annealing

Heng

et al. 2017

Opt. Mater. Express

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“…This may suggest that the prepared anatase TiO 2 nanowires contain high density of defects, which create significant intermediate states between the conduction and valence bands. These states can potentially absorb sub-bandgap photons and affect the optical properties of materials, resulting in a narrower bandgap than the perfect bulk materials. , After impregnation with Pt 2+ cations, the LPT-TiO 2 NWP-supported Pt catalyst shows a decrease of energy bandgap from 2.95 to 2.62 eV with the increasing amount of Pt loading from 0 to 5 wt % (Figure a). For the ANT-TiO 2 NWP-supported samples, no significant change in the energy bandgap was observed with the increase of Pt loading (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Ion-Exchange Loading Promoted Stability of Platinum Catalysts Supported on Layered Protonated Titanate-Derived Titania Nanoarrays

Lu¹,

Tang²,

Du³

et al. 2019

ACS Appl. Mater. Interfaces

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Supported metal catalysts are one of the major classes of heterogeneous catalysts, which demand good stability in both the supports and catalysts. Herein, layered protonated titanate-derived TiO2 (LPT-TiO2) nanowire arrays were synthesized to support platinum catalysts using different loading processes. The Pt ion-exchange loading on pristine LPTs followed by thermal annealing resulted in superior Pt catalysts supported on the LPT-TiO2 nanoarrays with excellent hydrothermal stability and catalytic performance toward CO and NO oxidations as compared to the Pt catalysts through wet-impregnation on the anatase TiO2 (ANT-TiO2) nanoarrays resulted from thermal annealing of LPT nanoarrays. Both loading processes resulted in highly dispersed Pt nanoparticles (NPs) with average sizes smaller than 1 nm at their pristine states. However, after hydrothermal aging at 800 °C for 50 h, highly dispersed Pt NPs were only retained on the ion-exchanged LPT-TiO2 nanoarrays with the support structure consisting of a mixture of 74% anatase and 26% rutile TiO2. For the wet-impregnation loading directly on anatase TiO2 nanoarrays derived from LPT, the Pt catalysts experienced severe agglomeration after hydrothermal aging, with the nanoarray supports consisting of 86% anatase and 14% rutile TiO2. Spectroscopy analysis suggested that Pt2+ cations intercalated into the interlayers of the titanate frameworks through ion-exchange impregnation procedure, which altered the chemical and electronic structures of the catalysts, resulting in the shifts of the electronic binding energy, Raman bands, and optical energy bandgap. The ion-exchangeable nature of LPT nanoarrays clearly provides a structural modification in Pt-doped LPT that has resulted in a strong interaction between the Pt catalysts and LPT-TiO2 nanoarray supports, leading to the enhanced hydrothermal stability of the catalysts. Considering the wide applications of the LPT and TiO2 nanomaterials as supports for catalysts, this finding provides a new pathway to design highly stable supported metal catalysts for different reactions.

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“…Arrays of ZnO nanorods were synthesized on silica glass using the hydrothermal method [11,12], which was carried out in an aqueous solution of zinc nitrate and hexamethylenetetramine (C6H12N4). Hydrothermal treatment was carried out in the temperature range 90-97 ° C for 1-3 hours with vigorous stirring.…”

Section: Methodsmentioning

confidence: 99%

The Study of the Structure Based on the Array of ZnO-Nanorods as a Sensor of the Gas Flow Rate

Petrov

Starnikova

2020

The 6th International Electronic Conference on Sensors and Applications

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This work shows the possibility of using arrays of ZnO nanorods grown on a glass substrate as a sensitive element for measuring air flow velocity. Since oxide semiconductors have a temperature dependence of resistance, a theoretical and experimental assessment was made of the influence of air velocity on the increase in resistance of a sensitive element. It has been theoretically shown that when air is blown through, the temperature of the free end of the ZnO nanorod can decrease by several degrees. An experimental evaluation showed that when gas is blown at a speed of 12.5 cm/s, the resistance of the sensing element increases by about 20%, which is equivalent to a temperature increase of about 4 degrees. In addition, it was found that the dependence of the increase in the resistance of the sensitive element when exposed to an air flow from 0 to 12.5 cm / s is close to linear.

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Effect of thermal annealing on properties of polycrystalline ZnO thin films

Cited by 21 publications

References 19 publications

Strong near band edge emission of (Ce, Yb) co-doped ZnO thin films after high temperature annealing

Strong near band edge emission of (Ce, Yb) co-doped ZnO thin films after high temperature annealing

Ion-Exchange Loading Promoted Stability of Platinum Catalysts Supported on Layered Protonated Titanate-Derived Titania Nanoarrays

The Study of the Structure Based on the Array of ZnO-Nanorods as a Sensor of the Gas Flow Rate

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