Crystalline Size Effects on Texture Coefficient, Electrical and Optical Properties of Sputter-deposited Ga-doped ZnO Thin Films

Wang, Yaqin; Tang, Wu; Zhang, Lan

doi:10.1016/j.jmst.2014.11.009

Cited by 145 publications

(40 citation statements)

References 45 publications

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“…Preferred orientation exists in all samples. In order to explain the degree of the silver thin films' preferred orientation, the texture coefficients of (111) plane and (100) plane (P (111) and P (100) ) were represented quantitatively by the Harris method in the following formula [15,16]:…”

Section: Crystal Orientation Of Silver In Filmsmentioning

confidence: 99%

Understanding the Preferred Crystal Orientation of Sputtered Silver in Ar/N₂ Atmosphere: A Microstructure Investigation

Zhu

Zhang

et al. 2019

Advances in Materials Science and Engineering

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Silver thin films were prepared by direct current (DC) magnetron sputtering technique in Ar/N2 atmosphere with various N2 volumetric ratios on Si substrates. Silver thin films prepared in pure Ar atmosphere show highly (111) preferred orientation. However, as the N2 content increases, Ag (111) preferred orientation evolves into (100) preferred orientation gradually. When N2 content is more than 12.5 vol.%, silver thin films exhibit highly (100) preferred orientation. Moreover, the average grain size decreases with increasing N2 content. Silver thin films with low relative density are prepared at high N2 content, which results in higher resistivity of films. By analyzing the resistivity and microstructures of silver thin films, the optimum range of N2 content to get compact silver thin films is found to be not more than 33.3 vol.%. Finally, the mechanism of N2 addition on microstructure evolution of silver thin films was proposed.

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Section: Crystal Orientation Of Silver In Filmsmentioning

confidence: 99%

Understanding the Preferred Crystal Orientation of Sputtered Silver in Ar/N₂ Atmosphere: A Microstructure Investigation

Zhu

Zhang

et al. 2019

Advances in Materials Science and Engineering

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“…37 Also, the texture coefficient in the three major planes is revealed closely to 1 for each sample implying a randomized orientation of crystals. 38 This could indicate that GQDs have no specific effect on any growth direction of the nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

Modified graphene quantum dots-zinc oxide nanocomposites for photocatalytic degradation of organic dyes and commercial herbicide

Phophayu

Pimpang

Wongrerkdee

et al. 2019

Journal of Reinforced Plastics and Composites

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The high crystallinity of graphene quantum dots-ZnO nanocomposites is considered to have a significant effect in improving the carrier lifetime for enhanced photocatalytic degradation. The graphene quantum dots-ZnO nanocomposites were synthesized by adding graphene quantum dots solution into starting precursors during the precipitation. Characterization was performed using various techniques. High crystallinity of graphene quantum dots-ZnO nanocomposites is obtained in terms of increased crystal size and decreased dislocation density. The improved crystallinity increases the carrier lifetime on the material surface for the functional improvement of photocatalytic material. Photocatalytic test of methylene blue and methyl orange was performed under UV irradiation. Degradation rate constant reaches the maximum value for both organic dyes for the appropriate preparing condition of graphene quantum dots-ZnO nanocomposites. The graphene quantum dots-ZnO nanocomposites were then applied to degrade commercial glyphosate herbicide contaminants for an agricultural wastewater treatment investigation. The investigation aims to demonstrate a facile useful way of herbicide contaminant reduction for the better health of farmers. The graphene quantum dots-ZnO nanocomposites show an enhancement of the photocatalytic process with improved degradation rate constant (23% increased) in comparison to pure ZnO. Therefore, this work demonstrates that graphene quantum dots-ZnO nanocomposites can be used as a photocatalytic material for degrading organic dyes and commercial herbicide contaminants owing to its low-cost and environmental-friendly properties.

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“…The primary TiO 2 particles possess an acicular shape morphology having well faceted faces. These primary particles are irregular in size distribution with an average of 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 corresponding to Zn-4s levels [25]. The absorbance decreases for the formed composite in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 photoluminescence e...…”

Section: Resultsmentioning

confidence: 99%

Hierarchical nano ZnO-micro TiO2 composites: High UV protection yield lowering photodegradation in sunscreens

Reinosa

Álvarez-Docio

Ramírez

et al. 2018

Ceramics International

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TiO 2 is a commonly used semiconductor photocatalyst but, as a paradox, it is also widely used as UV filter in sunscreens. Moreover, its capacity to form free radicals under UV irradiation generates reactive free radicals that provoke sunscreens degradation. In this work a hierarchical composite made of ZnO nanoparticles anchored onto TiO 2 microparticles is developed in a safe-by-design way by using the sol-gel method. The aim of this composite is to gain the advantages of inorganic nanoparticles avoiding their potential drawbacks. The hierarchical composite presents higher UV absorption than the pure TiO 2 or ZnO counterparts.The functional stability study on standard sunscreen reveals a 50% high Solar ProtectionFactor (SPF) values over time for the hierarchical composite lowering the photodegradation of the formulation. Under authors´ knowledge, it is the first time that the combination of these oxides increases the UV attenuation as inhibits the negative effects of free radicals. The high UV absorption without degradation opens a new orientation for the effective use of UVabsorbers without the photocatalyst adverse effects. The results in sunscreens generate a proposed mechanism of functionality that explains the observed differences on the efficiency of photocatalytic activity of these materials for other application fields.Both oxides act as inorganic UV blockers, so they are used into sunscreens in order to protect the skin, but the effective degradation of organic substances by the photocatalyst effect is contrary to applications in which the matrix must be preserved as paints, paper, plastics or cosmetics. In these cases, a proposed solution consists of doping trap centers into TiO 2 and ZnO, resulting in the elimination of free radicals generation and ROS [4]. Also, the aggregation of metal oxide nanoparticles has been found to decrease the photocatalytic properties in the generation of the mentioned species [5,10].

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Crystalline Size Effects on Texture Coefficient, Electrical and Optical Properties of Sputter-deposited Ga-doped ZnO Thin Films

Cited by 145 publications

References 45 publications

Understanding the Preferred Crystal Orientation of Sputtered Silver in Ar/N₂ Atmosphere: A Microstructure Investigation

Understanding the Preferred Crystal Orientation of Sputtered Silver in Ar/N₂ Atmosphere: A Microstructure Investigation

Modified graphene quantum dots-zinc oxide nanocomposites for photocatalytic degradation of organic dyes and commercial herbicide

Hierarchical nano ZnO-micro TiO2 composites: High UV protection yield lowering photodegradation in sunscreens

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Crystalline Size Effects on Texture Coefficient, Electrical and Optical Properties of Sputter-deposited Ga-doped ZnO Thin Films

Cited by 145 publications

References 45 publications

Understanding the Preferred Crystal Orientation of Sputtered Silver in Ar/N2 Atmosphere: A Microstructure Investigation

Understanding the Preferred Crystal Orientation of Sputtered Silver in Ar/N2 Atmosphere: A Microstructure Investigation

Modified graphene quantum dots-zinc oxide nanocomposites for photocatalytic degradation of organic dyes and commercial herbicide

Hierarchical nano ZnO-micro TiO2 composites: High UV protection yield lowering photodegradation in sunscreens

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Understanding the Preferred Crystal Orientation of Sputtered Silver in Ar/N₂ Atmosphere: A Microstructure Investigation

Understanding the Preferred Crystal Orientation of Sputtered Silver in Ar/N₂ Atmosphere: A Microstructure Investigation