Photoinduced superhydrophilicity and photocatalytic properties of ZnO nanoplatelets

Barreca, Davide; Gasparotto, Alberto; Maccato, Chiara; Tondello, Eugenio; Štangar, Urška Lavrenčić; Patil, Suhas R.

doi:10.1016/j.surfcoat.2009.02.002

Cited by 54 publications

(64 citation statements)

References 34 publications

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“…3a) and the corresponding rms roughness, as high as 42 nm. [1,[31][32][33][34][35] Since the effective surface area is typically larger for a rough surface, [10][11] the obtainment of such morphology might be an interesting starting point in view of possible photocatalytic or gas sensing applications. In the case of precursor 1, a further increase in the substrate temperature to 700 8C led to the formation of a film composed of interconnected aggregates (average size % 100 nm), resulting in a more compact crosssectional assembly and an appreciably lower overall thickness.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, it has received widespread and significant attention for various technological applications, ranging from optics and optoelectronics to gas sensing and photocatalysis. [1][2][3][4][5][6][7][8][9][10][11] There have been several reports on the fabrication of ZnO thin films or nanostructures, including thermal evaporation, sputtering, pulsed laser deposition, molecular beam epitaxy (MBE), sol-gel, atomic layer deposition (ALD), and MOCVD. [1,6,10,[12][13][14] Among them, the latter is by far the most promising technique for large scale production, and more importantly, by varying the CVD process parameters and nature of the precursors, it is possible to regulate the morphology and structure of the films.…”

Section: Introductionmentioning

confidence: 99%

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MOCVD of ZnO Films from Bis(Ketoiminato)Zn(II) Precursors: Structure, Morphology and Optical Properties

Bekermann

Ludwig

Toader

et al. 2011

Chemical Vapor Deposition

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Two closely related bis(ketoiminato) zinc precursors, which are air stable and possess favorable properties for metal-organic (MO)CVD, are successfully employed for the growth of ZnO films on silicon and borosilicate glass substrates at temperatures between 400 and 700°C. The as-deposited films are investigated by X-ray diffraction (XRD), field emission scanning electron\ud microscopy (FESEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), nuclear reaction analysis\ud (NRA), as well as by UV-vis absorption spectroscopy and photoluminescence (PL) measurements. The structure, morphology,\ud and composition of the as-grown films show a strong dependence on the substrate temperature. The formation of pure and\ud (001)-oriented wurtzite-type stoichiometric ZnO is observed. PL measurements are performed both at room temperature and\ud 77 K, revealing a defect-free emission of ZnO films

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MOCVD of ZnO Films from Bis(Ketoiminato)Zn(II) Precursors: Structure, Morphology and Optical Properties

Bekermann

Ludwig

Toader

et al. 2011

Chemical Vapor Deposition

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“…In this case, the surface RMS roughness increased to 120 nm. Since the active surface area is typically higher for a rough surface, [ 111 ] improved photocatalytic performances in H 2 evolution can be expected for CuO-NW arrays, also considering that their morphology might promote light scattering events and results in an improved radiation harvesting. This prediction is indeed confi rmed by the hydrogen evolution rate per unit area (Figure 4 c,d), not only upon UV-light but even on visible-light excitation, paving the way to promising technological applications.…”

Section: Photocatalytic Hydrogen Productionmentioning

confidence: 99%

Supported Metal Oxide Nanosystems for Hydrogen Photogeneration: Quo Vadis?

Barreca

Carraro

Gombac

et al. 2011

Adv Funct Materials

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Hydrogen has attracted a great share of attention both as an energy carrier and as an irreplaceble reagent for many industrial processes. Photoactivated routes, ranging from photocatalytic and photo‐electrochemical water splitting to photoreforming of suitable oxygenates, appear to be attractive long‐term solutions among possible strategies for hydrogen production. However, the success of such processes depends on the efficient use of solar energy and on the identification of active and stable catalysts, which, in addition, should be eco‐friendly and available in large amounts at accessible costs. Researchers are exploring the use of supported oxide nanomaterials, which enable an easy catalyst recovery and exhibit unique advantages due to their peculiar nano‐organization. In this Feature Article, the potential of such systems towards photoinduced hydrogen evolution is discussed based on selected case studies that highlight the relations between structure, morphology, composition, and functional performances of oxide nanomaterials. In addition, potential limitations of oxide‐based nanomaterials as well as unexplored key aspects that require special attention in future investigations are discussed.

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“…The authors reported that TiO2 loaded on AC activated by UV irradiation can act as electron carriers to stop recombination of electron-hole species, which would cause greater oxidation of o-xylene in the air stream (Puma et al, 2008). Davide Barreca et al (Barreca et al, 2009) proposed that AC loaded with a photocatalyst (such as TiO2 and ZnO) has the potency to decompose the intermediate products in situ which will enhance the removal efficiency of the photocatalyst. In comparison with GAC, the CUR of ZnO/GAC was much lower, although it is developed by reducing the residence time for both catalysts.…”

Section: Influence Of Initial O-xylene Concentrationmentioning

confidence: 99%

Photocatalytic abatement of o-xylene using adsorption enhanced ZnO/GAC catalyst in a continuous flow reactor: Catalytic potential, Fate of o-xylene and its by-products

2017

Global NEST Journal

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Photocatalytic abatement of o-xylene was investigated by immobilized ZnO on granular activated carbon (ZnO/GAC) under UV irradiation. Immobilization of ZnO increased the breakthrough time and removal capacity by 51 and 57%, respectively, in optimal conditions. The catalytic potential of the ZnO/GAC (86.5%) for o-xylene removal was far greater than simple GAC (13.5%), at the optimum condition. The maximum removal capacity with ZnO/GAC (3.12g o-xylene /gZnO/GAC) was observed at 100 °C, while the maximum removal capacity of simple GAC (1.37 g oxylene/g GAC) was observed a t 20 °C. The main intermediates of the o-xylene oxidation in photocatalytic process with GAC were methanoic acid, o-nitro-p-cresol, phenylmethanal, and methyl di-phenyl-methane. ZnO/GAC can highly catalyze the degradation of o-xylene in the presence of UV, with methanoic acid being the major intermediate desorbed from the bed. The results demonstrated that the ZnO/GAC is an efficient option for the removal of VOCs and biohazards emitted from industrial streams.

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Photoinduced superhydrophilicity and photocatalytic properties of ZnO nanoplatelets

Cited by 54 publications

References 34 publications

MOCVD of ZnO Films from Bis(Ketoiminato)Zn(II) Precursors: Structure, Morphology and Optical Properties

MOCVD of ZnO Films from Bis(Ketoiminato)Zn(II) Precursors: Structure, Morphology and Optical Properties

Supported Metal Oxide Nanosystems for Hydrogen Photogeneration: Quo Vadis?

Photocatalytic abatement of o-xylene using adsorption enhanced ZnO/GAC catalyst in a continuous flow reactor: Catalytic potential, Fate of o-xylene and its by-products

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