Effect of polar and non-polar surfaces of ZnO nanostructures on photocatalytic properties

Yang, Jing; Wang, Jian; Li, Xiuyan; Lang, Jihui; Liu, Fuzhu; Yang, Lili; Zhai, Heng; Gao, Ming; Zhao, Xiaoting

doi:10.1016/j.jallcom.2012.02.162

Cited by 58 publications

(28 citation statements)

References 48 publications

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“…Furthermore, high crystal quality is made available because the material experiences no thermal stress during growth. Associating the XRD results with the photocatalytic degradation of RhB, it is possible to conclude that the growth increase along the c-axis does not provide better photocatalytic activity, contrary to what some authors claim, 2,8,14,19,20 no correlation between these parameters was observed. In analyzing the morphology of the samples and the photocatalytic activity response, it is apparent that a perfect formation of the microstructures composed by nanorods does not necessarily have the highest photocatalytic activity.…”

Section: Xrd Characterizationcontrasting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

“…Semiconductors such as TiO 2 and ZnO have been widely used for this purpose, not only for dye and organic pollutants degradation, but also for water sterilization, eliminating pernicious bacteria and viruses. 1,2 Over the past years, ZnO has attracted great attention, mostly due to the variety of morphological structures (nanowires, flower--like structures, discs) and their applications. Atomic arrangements and coordination can play an important role in the photocatalytic process, and materials with special morphology and large specific surface area-to-volume ratio may exhibit higher efficiency in the degradation of organic pollutants than bulk ones.…”

Section: Introductionmentioning

confidence: 99%

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OBTAINING ZnO IMMOBILIZED OVER DIFFERENT SUBSTRATES BY HYDROTHERMAL TREATMENT FOR PHOTOCATALYSIS APPLICATION

Bagnara¹,

Farias²,

Lansarin³

2016

Química Nova

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The aim of this work is to systematically explore the effect of the synthesis conditions of ZnO structures, immobilized on different substrates by hydrothermal treatment, in its photocatalytic activity. A circumscribed central composite design of experiments was used to analyze the effects of reagents stoichiometry, reaction time and temperature, covering a wide range of these variables. The substrates used were etched glass, copper and zinc foils. The photocatalytic activity of the as-obtained ZnO samples was evaluated through photocatalytic degradation of rhodamine B (RhB) in aqueous solution under UV irradiation. Zinc foils presented the best immobilized film quality and the maximum dye removal was 80% in one hour of UV exposure.

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Section: Xrd Characterizationcontrasting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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OBTAINING ZnO IMMOBILIZED OVER DIFFERENT SUBSTRATES BY HYDROTHERMAL TREATMENT FOR PHOTOCATALYSIS APPLICATION

Bagnara¹,

Farias²,

Lansarin³

2016

Química Nova

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“…The angular resolution is ~0.01°. Using these techniques, 3D deformed microstructures in deformed samples (<50% deformation) have been resolved with submicrometre resolution [54].…”

Section: Combining Ebsd and In-situ Ecc To Follow Boundary Migrationmentioning

confidence: 99%

Boundary migration during recrystallization: experimental observations

Zhang

Jensen

2015

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Although it is not ferroelectric, the oppositely poled surfaces of ZnO display dramatically different reactivities. [8][9][10][11][12][13][14][15] Therefore, in this paper the interaction of non-polar Cr 2 O 3 with the ZnO 0001 and 0001 surfaces is explored with the goal of determining how much substrate polarization can impact the properties of a thin non-polar layer.…”

Section: Introductionmentioning

confidence: 99%

Growth, structure, and electronic properties of nonpolar thin films on a polar substrate:Cr2O3on ZnO (0001) and ZnO (0001¯
Zhu
¹
,
Morales-Acosta
²
,
Shen
³

et al. 2015
Phys. Rev. B
10
0
3
0
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The growth and geometric and electronic structures of Cr 2 O 3 layers on the polar ZnO surfaces were characterized to determine how polar substrates can influence the properties of non-polar films. Photoelectron spectroscopy (XPS and UPS), high resolution transmission electron microscopy (HRTEM), electron diffraction (RHEED and LEED), and x-ray diffraction and reflectivity (XRD and XRR) were employed to characterize the growth mode, film quality and interfacial electronic properties. Chromium oxide growth on ZnO 0001 and 0001 followed the same trends: two dimensional growth with initial disorder followed by the formation of epitaxial Cr 2 O 3 0001 . Despite the initial disorder, HRTEM and XRD/XRR measurements on thicker films revealed an abrupt interface with the Cr 2 O 3 lattice extending all the way to the interface. This indicates that above a critical thickness of 10 -15 Cr-O 3 -Cr repeat units the entire film reorganizes into an ordered structure. It is postulated that the oxygen remained ordered throughout the growth but that the chromium initially filled interstices randomly in the oxygen sublattice which allowed the film to eventually grow with a well-defined epitaxial relationship with the substrate. The polar interfaces showed a small band offset that decayed with increasing film thickness, suggesting that the compensating charges at the interface 2 may partially migrate to the film surface. No evidence of formal changes in the Cr oxidation state at the interfaces was seen. On the other hand, statistical analyses of UPS valence band spectra revealed an enhanced density of states near the valence band edge for Cr 2 O 3 on ZnO 0001 , consistent with stabilization of the positive interface by filling surface electronic states.In contrast, no significant valence band differences were observed between bulk Cr 2 O 3 and thin Cr 2 O 3 layers on ZnO 0001 suggesting a different charge compensation mechanism on the negative surface. The potential impact of these findings on the surface properties of chromium oxide thin films is discussed. PACS number(s): 68.47.Gh,

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Effect of polar and non-polar surfaces of ZnO nanostructures on photocatalytic properties

Cited by 58 publications

References 48 publications

OBTAINING ZnO IMMOBILIZED OVER DIFFERENT SUBSTRATES BY HYDROTHERMAL TREATMENT FOR PHOTOCATALYSIS APPLICATION

OBTAINING ZnO IMMOBILIZED OVER DIFFERENT SUBSTRATES BY HYDROTHERMAL TREATMENT FOR PHOTOCATALYSIS APPLICATION

Boundary migration during recrystallization: experimental observations

Growth, structure, and electronic properties of nonpolar thin films on a polar substrate:Cr2O3on ZnO (0001) and ZnO (0001¯
Zhu
¹
,
Morales-Acosta
²
,
Shen
³

et al. 2015
Phys. Rev. B
10
0
3
0
View full text Add to dashboard Cite

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Effect of polar and non-polar surfaces of ZnO nanostructures on photocatalytic properties

Cited by 58 publications

References 48 publications

OBTAINING ZnO IMMOBILIZED OVER DIFFERENT SUBSTRATES BY HYDROTHERMAL TREATMENT FOR PHOTOCATALYSIS APPLICATION

OBTAINING ZnO IMMOBILIZED OVER DIFFERENT SUBSTRATES BY HYDROTHERMAL TREATMENT FOR PHOTOCATALYSIS APPLICATION

Boundary migration during recrystallization: experimental observations

Growth, structure, and electronic properties of nonpolar thin films on a polar substrate:Cr2O3on ZnO (0001) and ZnO (0001¯Zhu1, Morales-Acosta2, Shen3 et al. 2015Phys. Rev. B10030View full textAdd to dashboardCite

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Growth, structure, and electronic properties of nonpolar thin films on a polar substrate:Cr2O3on ZnO (0001) and ZnO (0001¯
Zhu
¹
,
Morales-Acosta
²
,
Shen
³

et al. 2015
Phys. Rev. B
10
0
3
0
View full text Add to dashboard Cite