Effect of sol pH on microstructures, optical and magnetic properties of (Co,Fe)-codoped ZnO films synthesized by sol–gel method

Yuan, Huan; Zhang, Li; Xu, Ming

doi:10.1016/j.jallcom.2015.08.172

Cited by 20 publications

(4 citation statements)

References 47 publications

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“…Sol-gel synthesis is an effective route to obtain materials with specific and desirable properties because materials are mixed in the atomic level [2] . One of these advantages is obtaining solids with acidic and/or basic properties for use in a diversity of applications [3] . Some acidic solids were prepared by the sol-gel method, such as those by Köse et al . who used this technique to prepare an acidic semiconductor [4] , and Surech et al .…”

Section: Introductionmentioning

confidence: 99%

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Sol–gel La 2 O 3 –ZrO 2 mixed oxide catalysts for biodiesel production

Salinas

Sepúlveda

Escalona

et al. 2018

Journal of Energy Chemistry

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Section: Introductionmentioning

confidence: 99%

“…Yuan et al . studied the pH effect on ZrO films codoped with iron and cobalt, concluding that a tunable pH was capable of controlling the band gap energy of ZrO [3] . Usha et al .…”

Section: Introductionmentioning

confidence: 99%

Sol–gel La 2 O 3 –ZrO 2 mixed oxide catalysts for biodiesel production

Salinas

Sepúlveda

Escalona

et al. 2018

Journal of Energy Chemistry

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“…Some of the typical methods to obtain ZnO nanorods are the Vapor-Liquid-Solid (VLS), the Vapor-Solid (VS), and Metal Organic Chemical Vapor Deposition (MOCVD), which need temperatures from 500 to 1500 ∘ C [12,13]. There are, on the other hand, the solution phase synthesis methods, such as the hydrothermal, sol-gel, and spray pyrolysis [14][15][16], which in general need lower temperatures for the deposition. Among these chemical syntheses, the spray pyrolysis method (SP) is a good alternative to obtain ZnO nanostructured films.…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

Sprayed Pyrolyzed ZnO Films with Nanoflake and Nanorod Morphologies and Their Photocatalytic Activity

Portillo-Vélez

Bizarro

2016

Journal of Nanomaterials

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There is an increasing interest on the application of ZnO nanorods in photocatalysis and many growth methods have been applied, in particular the spray pyrolysis technique which is attractive for large scale production. However it is interesting to know if the nanorod morphology is the best considering its photocatalytic activity, stability, and cost effectiveness compared to a nonoriented growth. In this work we present a systematic study of the effect of the precursor solution (type of salt, solvent, and concentration) on the morphology of sprayed ZnO films to obtain nanoflakes and nanorods without the use of surfactants or catalysts. The surface properties and structural characteristics of these types of films were investigated to elucidate which morphology is more favorable for photocatalytic applications. Wettability and photocatalytic experiments were carried out in the same conditions. After UV irradiation both morphologies became hydrophilic and achieved a dye discoloration efficiency higher than 90%; however, the nanoflake morphology provided the highest photocatalytic performance (99% dye discoloration) and stability and the lowest energy consumption during the synthesis process. The surface-to-volume ratio revealed that the nanoflake morphology is more adequate for photocatalytic water treatment applications and that the thin nanorods should be preferred over the large ones.

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“…The precursor or starting solution plays a crucial role in the physical characteristics of the sprayed films. Some of the important parameters of the starting solution that can affect the thin film properties are solution chemistry, 8 precursors, [9][10][11] additives, 12,13 pH, [14][15][16][17][18][19] molarity, 20 doping 21 and solution aging. 22 However, to the best of our knowledge, the effect of water content in the starting solution on the characteristics of sprayed ZnO:Cu films has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Copper-Doped ZnO Thin Films Deposited by Spray Pyrolysis: Effect of Water Content in Starting Solution on Methylene Blue Degradation by Photocatalysis

Karthik

Maldonado

Olvera

et al. 2021

J. Electron. Mater.

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Copper-doped zinc oxide (ZnO:Cu) thin films were deposited by an ultrasonic spray pyrolysis technique on glass substrates. Doping concentration was maintained at 3 at %, and the deposition temperature was 450°C. The water content in the starting solution was varied in order to study its effect on the degradation of methylene blue (MB) dye by a photocatalytic process. X-ray diffraction patterns confirm the ZnO wurtzite structure and scanning electron microscopy analysis shows morphologies with different types of grains with average sizes varying from 90 to 300 nm. All the films achieved a maximum MB degradation of about 74% for a UV light exposition time of 180 min. However, the degradation behavior with respect to UV exposition time is different for each film. Two different degradation rates (0-90 min and 120-180 min exposure times, respectively) were performed for all ZnO films, and their photocatalytic response is related to the obtained surface morphology, which is explicated in this work. The films deposited with 80% water content in the starting solution are more promising for MB degradation when the UV exposure times are longer than 180 min. KeywordsCopper doping • zinc oxide • thin films • photocatalysis • methylene blue • ultrasonic spray pyrolysis * H. Gómez-Pozos

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Effect of sol pH on microstructures, optical and magnetic properties of (Co,Fe)-codoped ZnO films synthesized by sol–gel method

Cited by 20 publications

References 47 publications

Sol–gel La 2 O 3 –ZrO 2 mixed oxide catalysts for biodiesel production

Sol–gel La 2 O 3 –ZrO 2 mixed oxide catalysts for biodiesel production

Sprayed Pyrolyzed ZnO Films with Nanoflake and Nanorod Morphologies and Their Photocatalytic Activity

Copper-Doped ZnO Thin Films Deposited by Spray Pyrolysis: Effect of Water Content in Starting Solution on Methylene Blue Degradation by Photocatalysis

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