Surface morphology, microstructure and electrical properties of Ca-doped ZnO thin films

Omri, K.; Alyamani, Ahmed Y.; Mır, L. El

doi:10.1007/s10854-019-02039-9

Cited by 25 publications

(11 citation statements)

References 43 publications

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“…From transmission electron microscopy (TEM) investigations (Figure a), the ZnO NPs used as seeds for nanowire growth are spherical and monodisperse with an average size of 32 ± 4.7 nm. The crystallinity of the NPs was evaluated through powder X-ray diffraction (PXRD), which shows crystalline reflections for the (100), (002), (101), (102), (110), (103), and (112) planes (Figure S2) in agreement with previously reported values . Scanning electron microscopy (SEM) of the as-grown ZnO NWs shows highly oriented and tightly packed hexagonal wires with a calculated average diameter of 130 ± 28.2 nm (Figure b).…”

Section: Resultssupporting

confidence: 85%

“…The crystallinity of the NPs was evaluated through powder X-ray diffraction (PXRD), which shows crystalline reflections for the (100), (002), ( 101), ( 102), (110), (103), and (112) planes (Figure S2) in agreement with previously reported values. 46 Scanning electron microscopy (SEM) of the as-grown ZnO NWs shows highly oriented and tightly packed hexagonal wires with a calculated average diameter of 130 ± 28.2 nm (Figure 1b). These wires produce films of an average thickness of 1.3 μm as measured by profilometry.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Carbon Dot-Sensitized Photoanodes for Visible Light-Driven Organic Transformations

Villanueva

Manioudakis

Naccache

et al. 2020

ACS Appl. Nano Mater.

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Visible-light photosensitization of metal oxides to create heterostructures for the conversion of solar to chemical energy is a promising approach to produce solar fuels and other valuable chemicals. Carbon dots have recently been considered as suitable candidates to sensitize wide-band-gap metal oxide semiconductors due to their low cost and tunable optical properties. While photocatalytic systems using carbon dots as sensitizers have been reported, transformations involving the production of value-added chemicals as well as the electron transfer mechanisms underpinning photocatalysis within such heterostructures remain underexplored. Here, we report the sensitization of zinc oxide nanowires with carbon dots for the α-heteroarylation of 1-phenylpyrrolidine with 2chlorobenzothiazole under visible-light illumination at room temperature. The carbon dots improve the light absorption of the nanowires in the visible region of the spectrum affording the use of white light to drive catalysis. From optical spectroscopy and electrochemistry investigations of the resulting nanohybrid material, the photocatalytic properties are explained by the band alignment at the zinc oxide−carbon dot junction where a series of single-electron transfers create the necessary potential to oxidize 1-phenylpyrrolidine. The resulting cascade of electron transfers into and from the carbon dots drives the α-heteroarylation to a 97% yield after 24 h.

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Section: Resultssupporting

confidence: 85%

Section: ■ Results and Discussionmentioning

confidence: 99%

Carbon Dot-Sensitized Photoanodes for Visible Light-Driven Organic Transformations

Villanueva

Manioudakis

Naccache

et al. 2020

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…The crystallinity of the NPs was evaluated through powder X-ray diffraction (PXRD) which shows crystalline reflections for the (100), (002), (101), (102), (110), (103), and (112) planes (Figure S2) in agreement with previously reported literature values. 48 Scanning electron microscopy (SEM) of the as-grown ZnO NWs shows highly oriented and tightly packed hexagonal wires with a calculated average diameter of 130 ± 28.2 nm (Figure 1b). These wires produce films of an average thickness of 1.3 µm as measured by profilometry.…”

Section: Resultsmentioning

confidence: 99%

Carbon Dot Sensitized Photoanodes for Visible Light Driven Organic Transformations

Yarur¹,

Manioudakis²,

Naccache³

et al. 2019

Preprint

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Visible light photosensitization of metal oxides to create heterostructures for the conversion of solar-to-chemical energy is a promising approach to produce solar fuels and other valuable chemicals. Carbon dots have recently been considered as suitable candidates to sensitize wide bandgap metal oxide semiconductors due to their low cost and tunable optical properties. While photocatalytic systems using carbon dots as sensitizers have been reported, transformations involving the production of value-added chemicals as well as the electron transfer mechanisms underpinning photocatalysis within such heterostructures remain underexplored. Here we report the sensitization of zinc oxide nanowires with carbon dots for the α-heteroarylation of 1-phenylpyrrolidine with 2-chlorobenzothiazole under visible light illumination at room temperature. The carbon dots improve the light absorption of the nanowires in the visible region of the spectrum affording the use of white light to drive catalysis. From optical spectroscopy and electrochemistry investigations of the resulting nanohybrid material, the photocatalytic properties are explained by the band alignment at the zinc oxide-carbon dot junction where a series of single-electron transfers creates the necessary potential to oxidize 1-phenylpyrrolidine. The resulting cascade of electron transfers into and from the carbon dots drives the α-heteroarylation to a 97% yield after 24 hrs. <br>

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“…For example, porous zinc oxide films are known to possess excellent semiconductor properties with wide band gaps (i.e., ~3.37 eV), thereby rendering them suitable for application in gas sensors. More specifically, metal oxide semiconductor-based gas sensors are particularly desirable due to their good stability, superior selectivity, and fast reaction/recovery rates [ 10 , 11 , 12 ]. Porous zinc oxide films are also n-type semiconductor materials and, thus, are suitable for use in solar cells [ 13 ], photocatalysts [ 14 ], varistors, and electrodes.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Highly Porous and Pure Zinc Oxide Films Using Modified DC Magnetron Sputtering and Post-Oxidation

et al. 2021

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Porous films of metals and metal oxides exhibit larger surface areas and higher reactivities than those of dense films. Therefore, they have gained growing attention as potential materials for use in various applications. This study reports the use of a modified direct current magnetron sputtering method to form porous Zn-ZnO composite films, wherein a subsequent wet post-oxidation process is employed to fabricate pure porous ZnO films. The porous Zn-ZnO composite films were initially formed in clusters, and evaluation of their resulting properties allowed the optimal conditions to be determined. An oxygen ratio of 0.3% in the argon gas flow resulted in the best porosity, while a process pressure of 14 mTorr was optimal. Following deposition, porous ZnO films were obtained through rapid thermal annealing in the presence of water vapor, and the properties and porosities of the obtained films were analyzed. An oxidation temperature of 500 °C was optimal, with an oxidation time of 5 min giving a pure ZnO film with 26% porosity. Due to the fact that the films produced using this method are highly reliable, they could be employed in applications that require large specific surface areas, such as sensors, supercapacitors, and batteries.

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Surface morphology, microstructure and electrical properties of Ca-doped ZnO thin films

Cited by 25 publications

References 43 publications

Carbon Dot-Sensitized Photoanodes for Visible Light-Driven Organic Transformations

Carbon Dot-Sensitized Photoanodes for Visible Light-Driven Organic Transformations

Carbon Dot Sensitized Photoanodes for Visible Light Driven Organic Transformations

Fabrication of Highly Porous and Pure Zinc Oxide Films Using Modified DC Magnetron Sputtering and Post-Oxidation

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