Growth of Ternary Oxide Nanowires by Gold-Catalyzed Vapor-Phase Evaporation

Single-crystal ZnO nanowires long up to several microns were fabricated by one-step electrochemical deposition. A template-based process employing track-etched polycarbonate (TE-PC) membranes was used for this purpose. The morphology and the structure characteristics of the ZnO nanowires were analyzed by means of Scanning Electron Microscopy (SEM), Focused Ion Beam (FIB), Transmission Electron Microscopy (TEM), and Selected Area Electron Diffraction (SAED). The growth process conditions turned out to have a marked influence on the crystal nature and morphology of the nanowires. Deposition rates ranging from 0.4 nm s −1 and up to 0.6 nm s −1 were recorded for the growth of ZnO nanowires. The obtained results showed that by using carefully controlled deposition conditions single crystalline nanowires and fine-grained structures can be routinely obtained. ZnO has extrusive physical properties such as a direct bandgap in the ultraviolet range (3.37 eV) or a large exciton binding energy (60 meV) which have made it a great application prospect.1, 2 ZnO nano-objects have been widely investigated in the recent years owing to promising applications in nanodevices. They showed high sensitivity to different chemicals, have piezo-and pyro-electric properties, etc. 3,4 As it has been shown that band edge, exciton energies, and UV luminescence of ZnO nanostructures are affected by crystallite size and crystal morphology, 5,6 it is desirable to tailor their electronic properties in order to exploit the broad range of applications.Nowadays, many efforts still focus on synthesizing oriented onedimensional ZnO nanostructures. Up to now, techniques using sophisticated and expensive equipments but also low temperature and cost-effective methods such as electrodeposition (ED) and hydrothermal deposition were employed for the synthesis of nanostructures. 7-9The major advantage of the electrochemical synthesis is given by its application for large area and high throughput productions, therefore suitable for an industrial use. [10][11][12][13] The ED of ZnO nanowires has been focused mostly on the preparation of nanorod/nanowire arrays by the template method and on flat substrates. 14, 15The ZnO electrodeposition is based on the reduction of an oxygen precursor such as dissolved molecular oxygen, nitrate ions or hydrogen peroxide. For example, Cembrero et al. 16 reported on the cathodic electrodeposition of ZnO nanocolumns and nanowires from zinc chloride solutions saturated in molecular oxygen. The general scheme for ED of ZnO employing different oxygen precursors is supposed as follows.The reaction at the cathode surface employing different oxygen precursors: The process evolves itself drifting the pH of the electrolyte to a constant increase and to a local supersaturation of the bath in the vicinity of the electrode, thus provoking the precipitation on the electrode surface of ZnO;18 therefore, if a specific crystal order is desired, the pH of the electrolytic solution has to be precisely controlled and adjusted to a proper value.As...

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“…The After hydroxyl anions are generated, they immediately precipitate in presence of Zn 2+ to form Zn(OH) 2 which is easily dehydrated above 65…”

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confidence: 99%

Influence of Deposition Potential on Structure of ZnO Nanowires Synthesized in Track-Etched Membranes

Prună

Pullini

Mataix

2012

J. Electrochem. Soc.

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“…[4][5][6][7] Zn 2 SnO 4 is normally synthesized by solid state reactions with ZnO and SnO 2 at high temperatures. 8,9 The high temperature calcination of coprecipitated Zn and Sn hydroxides with the alkali from an aqueous solution were also used to prepare Zn 2 SnO 4 . 4,10 Recently, the hydrothermal synthesis of Zn 2 SnO 4 was reported.…”

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confidence: 99%

Photocatalytic Activities of Hydrothermally Synthesized Zn₂SnO₄

Kim¹,

Park²,

Huh³

2011

Bulletin of the Korean Chemical Society

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“…The results indicated that MB dye of 10 mg/l was photolyzed up to 5% in 2 hr. This degradation efficiency was negligible when the different sized (24,35 and 53 nm) nanoparticles were added to the solution under illumination. When there was no UV light, the concentration of MB dye with the addition of ZTO photocatalysts remains unchanged for 2 hr.…”

Section: Photocatalytic Performance Of Zto With Mb Dyementioning

confidence: 98%

“…Photocatalysis experiments were carried out with different sized (24,35 and 53 nm) ZTO nanoparticles (0.1 g in 100 ml of dye solution) and Methylene blue (MB) dye solution (10 ppm) in Millipore water. The photochemical reactor used in this study was made of a Pyrex glass jacketed quartz tube.…”

Section: Photocatalytic Degradation Of Mb Dye In Aqueous Solutionmentioning

confidence: 99%

Electrochemical Generation of Cubic Shaped Nano Zn2SnO4 Photocatalysts

2013

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Abstract:In this contribution, an efficient and simple two-step hybrid electrochemical-thermal route was developed for the synthesis of cubic shaped Zn2SnO4 (ZTO) nanoparticles using aqueous sodium bicarbonate (NaHCO3) and sodium stannate (Na2SnO3) electrolyte. The sacrificial Zn was used as anode and cathode in an undivided cell under galvanostatic mode at room temperature. The bath concentration and current density were respectively varied from 30 to 120 mmol and 0.05 to 1.5 A/dm 2 . The electrochemically generated precursor was calcined for an hour at different range of temperature from 60 to 600℃. The crystallite sizes in the range of 24-53 nm were calculated based on Debye-Scherrer equation. Scanning electron microscope and transmission electron microscopy results reveal that all the particles have cubic morphology with diameter of 40-50 nm. The as-prepared ZTO samples showed higher catalytic activity towards the degradation of methylene blue (MB) dye, and 90% degradation was found for the sample calcined at 600℃, which is greater than that of commercial TiO2-P25 photocatalysts. The photodegradation efficiency of ZTO samples was found to be a function of exposure time and the dye solution pH value. These results indicate that the ZTO nanoparticles may be employed to remove dyes from wastewater.

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Growth of Ternary Oxide Nanowires by Gold-Catalyzed Vapor-Phase Evaporation

Cited by 73 publications

References 28 publications

Influence of Deposition Potential on Structure of ZnO Nanowires Synthesized in Track-Etched Membranes

Influence of Deposition Potential on Structure of ZnO Nanowires Synthesized in Track-Etched Membranes

Photocatalytic Activities of Hydrothermally Synthesized Zn₂SnO₄

Electrochemical Generation of Cubic Shaped Nano Zn2SnO4 Photocatalysts

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Growth of Ternary Oxide Nanowires by Gold-Catalyzed Vapor-Phase Evaporation

Cited by 73 publications

References 28 publications

Influence of Deposition Potential on Structure of ZnO Nanowires Synthesized in Track-Etched Membranes

Influence of Deposition Potential on Structure of ZnO Nanowires Synthesized in Track-Etched Membranes

Photocatalytic Activities of Hydrothermally Synthesized Zn2SnO4

Electrochemical Generation of Cubic Shaped Nano Zn2SnO4 Photocatalysts

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Product

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Photocatalytic Activities of Hydrothermally Synthesized Zn₂SnO₄