Effect of Bath Temperature on the Electrodeposition Mechanism of Zinc Oxide Film from Zinc Nitrate Solution

Otani, S.; Katayama, Jun­ichi; Umemoto, Hiroshi; Matsuoka, Makoto

doi:10.1149/1.2205187

Cited by 61 publications

(50 citation statements)

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“…Recent method refinements have occurred for electrodeposition of zinc oxide on transparent conductive oxides (TCO), using lower concentrations of nitrate salt (<0.01 M) [6][7][8][9][10]. By lowering the salt concentration, the deposits appear to be less massive and more likely to form nanostructures on the electrode surface.…”

Section: Overview On Cobalt Hydroxidesmentioning

confidence: 99%

“…By lowering the salt concentration, the deposits appear to be less massive and more likely to form nanostructures on the electrode surface. However, these experiments used the transition metal nitrate salt for dual purposes: as the transition metal ion source and as the supporting electrolyte [8][9][10]. In addition, very little research has occurred using very low concentrations of transition metal salts with alkali nitrates added as a supporting electrolyte for hydroxyl generation [10,28].…”

Section: Overview On Cobalt Hydroxidesmentioning

confidence: 99%

“…Recently, cathodic electrogeneration of hydroxyl species has been applied toward the tailored growth of nanostructures on electrode surfaces, such as ZnO nanowires [5,6]. They have proved attractive for photovoltaic and optoelectronic applications [7][8][9][10]. This refinement in the electrodeposition process to produce designed nanostructures is due to the monitoring at the cathode of the OH − generation and diffusion of Zn 2+ ions present in very low concentration (∼10 −4 M).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nanostructured α- and β-cobalt hydroxide thin films

Brownson

Lévy‐Clément

2009

Electrochimica Acta

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Section: Overview On Cobalt Hydroxidesmentioning

confidence: 99%

Section: Overview On Cobalt Hydroxidesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanostructured α- and β-cobalt hydroxide thin films

Brownson

Lévy‐Clément

2009

Electrochimica Acta

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“…The pH range in which ZnO is thermodynamically stable was calculated to be above 6.10 at 298 K and above 5.28 at 333 K by Otani et al (2006). Figure 4 shows the XPS spectra of the O1s region (bottom) and Zn 2p region (top) from the surface of the film prepared with the lowest cobalt(II) amount and after surface etching.…”

Section: Morphology and Structurementioning

confidence: 99%

Hydrothermal–electrochemical growth of heterogeneous ZnO: Co films

Yilmaz

Ünal

2017

Appl Nanosci

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This study demonstrates the preparation of heterogeneous ZnO: Co nanostructures via hydrothermalelectrochemical deposition at 130°C and -1.1 V (vs Ag/ AgCl (satd)) in dimethyl sulfoxide (DMSO)-H 2 O mixture. Under the stated conditions, ZnO: Co nanostructures grow preferentially along (002) direction. Strength of directional growth progressively increases with the increasing concentration of Co(II) in the deposition bath. Films are composed of hexagonal Wurtzite ZnO, metallic cobalt, and mixed cobalt oxide on the surface and cobalt(II) oxide in deeper levels. Increasing the Co(II) concentration in the deposition bath results in different morphological features as well as phase separation. Platelets, sponge-like structures, cobalt-rich spheres, microislands of cobalt-rich spheres which are interconnected by ZnO network can be synthesized by adjusting [Co(II)]: [Zn(II)] ratio. Growth mechanisms giving rise to these particular structures, surface morphology, crystal structure, phase purity, chemical binding characteristics, and optical properties of the deposits are discussed in detail.

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“…3 On the other hand, the electrolyte of zinc nitrate-6-hydrate electrolyte used for Zn-ZnO nanocomposites formation can prevent Cl 2 contamination and meets the requirement of environmental protection. However, only ZnO was obtained at various deposition temperatures, 9 which could result from the lower applied current density. In this paper, a higher current density was used to prepare Zn-ZnO nanocomposites using zinc nitrate-6-hydrate electrolyte.…”

mentioning

confidence: 99%

Optical Emissions of Zn and ZnO in Zn-ZnO Structure Synthesized by Electrodeposition with Aqueous Solution of Zinc Nitrate-6-hydrate

Lee

2008

Crystal Growth & Design

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Both hexagonal zinc and wurtzite zinc oxide were deposited on p-type silicon substrate by the electrodeposition with an aqueous solution of zinc nitrate-6-hydrate near room temperature. Zinc dominates the growth at higher current density, and zinc oxide dominates the growth at higher deposition temperature. The optical emission from zinc and zinc oxide nanostructures are observed from microphotoluminescence spectra.Zinc oxide (ZnO) with wide direct band gap of 3.37 eV and high excitonic binding energy of 60 mV is a promising material for optoelectronic applications. It can perform ultraviolet (UV) emission at room temperature (RT). 1 Several reports indicate that ZnO has high photocatalytic efficiency. [2][3][4] The semiconductor-metal nanocomposites are expected to have higher potentials in catalysis, optics, and magnetic applications. [5][6][7] Recently, Zn-ZnO nanocomposites was obtained using ZnCl 2 electrolyte by the electrodeposition method at room temperature. 8 The electrodeposition method is an efficient way to prepare ZnO films at low temperature. 2 The shape and size of ZnO can be modulated by the cathodic potential, current density, 2 or adding molecular agents into the electrolyte. 3 On the other hand, the electrolyte of zinc nitrate-6-hydrate electrolyte used for Zn-ZnO nanocomposites formation can prevent Cl 2 contamination and meets the requirement of environmental protection. However, only ZnO was obtained at various deposition temperatures, 9 which could result from the lower applied current density. In this paper, a higher current density was used to prepare Zn-ZnO nanocomposites using zinc nitrate-6-hydrate electrolyte. The formation mechanism of Zn-ZnO nanocomposite and the role of Zn were also investigated.Several papers have been reported to prepare electrodeposited ZnO films at temperatures above 60°C on conductive electrodes, for example, indium tin oxide, 2,4 fluorine-doped tin oxide, 10 or n-type silicon 4 and gallium nitride 11 substrates. Boron-doped P-type (100) Si wafer with resistivity of 1-10 Ω-cm was used as the substrate in this experiment. The p-Si wafer is rarely used in electrodeposition, and we developed a simple way to deposit ZnO onto it. By this method, we can further build a structure of high quality n-ZnO on p-substrates to apply p-n junction devices. Otherwise, the heterojunction of n-ZnO and p-Si has the potential to separate the electron and hole and benefits the photocatalysis.Aluminum cathode was evaporated on the backside of the Si substrate. It was then coated with photoresist for the protection of the Al electrode during ZnO growth. A platinum sheet was used as the anode electrode. 0.1 M zinc nitrate-6-hydrate aqueous solution was used as the electrolyte. In order to investigate the function of current density (fixed at 0.1, 1, 10, and 20 mA/cm 2 ) for electrodepsited ZnO, the deposition temperature was fixed at 30°C. In order to investigate the function of deposition temperature (fixed at 30 and 65°C), the current density was fixed at 20 mA/cm 2 . T...

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Effect of Bath Temperature on the Electrodeposition Mechanism of Zinc Oxide Film from Zinc Nitrate Solution

Cited by 61 publications

References 13 publications

Nanostructured α- and β-cobalt hydroxide thin films

Nanostructured α- and β-cobalt hydroxide thin films

Hydrothermal–electrochemical growth of heterogeneous ZnO: Co films

Optical Emissions of Zn and ZnO in Zn-ZnO Structure Synthesized by Electrodeposition with Aqueous Solution of Zinc Nitrate-6-hydrate

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