Electrochemical Coprecipitation of Zinc and Aluminum in Aqueous Electrolytes for ZnO and AZO Coverage Deposition

Мартынова, Н. А.; Svishchev, Viktor N.; Лепнев, Л. С.; Alieva, Shakhnozabonu R.; Chertorylskaya, Elena G.; Vishnevskiy, Mikhail E.; Bozhko, A. D.; Grigorieva, Anastasia V.

doi:10.1155/2019/6808347

Cited by 7 publications

(10 citation statements)

References 25 publications

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“…The amount of the precipitated metal and, consequently, film thickness h, was estimated using Faraday law from the deposition charge under the assumption of 100% current efficiency. To obtain zinc oxide with wurtzite structure the samples were annealed additionally at 500 °C for 3 h in air according to previous results [31].…”

Section: Methodsmentioning

confidence: 99%

Electrochemicaly formed ZnO and Au/ZnO opal films

et al. 2020

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ZnO inverse opal films were synthesized electrochemically using aqueous and non-aqueous zinc acetate electrolytes and ITO deposited polystyrene opal matrices. The following thermal oxidation in air was performed for further application in optoelectronics. The overall composition and deposition potentials varied to reach uniform porous films with opal structure. Most uniform photonic film of ZnO with zincite structure has been deposited from DMSO electrolyte. Photoluminescence spectra of the ZnO coverages showed more complex spectra for precipitates sedimented from aqueous baths than from DMSO. Less deficient films of opal ZnO films deposited from DMSO demonstrated lower scattering effect compared to coverages deposited from aqueous electrolytes. Magnetron sputtering was applied for Au/ZnO composite film formation. The optical spectra of the Au/ZnO composite coverages correlate to spectra of uniform Au opal films.

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Section: Methodsmentioning

confidence: 99%

Electrochemicaly formed ZnO and Au/ZnO opal films

et al. 2020

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“…4 Several studies indicate that Al-doping ZnO results in a clear improvement in transparency and conductivity. 8 There are different routes for obtaining AZO thin films, for example, chemical routes, such as the electrochemical coprecipitation from nitrate electrolytic baths 9 and the self-limiting deposition method of atomic layer deposition, 10 and physical vapor deposition processes, such as thermal evaporation of a zinc-aluminum alloy in the presence of oxygen 11 or even sputtering using a target composed of a mixture of ZnO and Al 2 O 3 . 12 Recent works using ZnO targets with 1.5-2 wt% Al 2 O 3 show that the lowest resistivity results at around 10 2 to 10 −4 Ω cm and the maximum transmittance at around 92% and 95% in the visible light range.…”

Section: Introductionmentioning

confidence: 99%

Versatile r.f. magnetron sputtering doping method to produce aluminum‐doped zinc oxide films

de Oliveira,

Escote,

Nantes

et al. 2024

J Am Ceram Soc.

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Aluminum‐doped zinc oxide Al:ZnO (AZO) is a non‐toxic material applied as a transparent conductive oxide film. In this study, we report on the structural, optical, and electrical properties of AZO films obtained by thermally oxidizing aluminum‐doped Zn films produced by a versatile and low‐cost method of doping using the magnetron sputtering technique deposition. We use aluminum wire above the zinc target to produce Al:Zn films. The influence of r.f. power and different Al wire lengths on the AZO film properties were studied. The resulting AZO films exhibited Al concentrations of up to 2.85% and an optical gap between 3.22 and 3.29 eV. The transmittance was greater than 80% for all samples, and the electrical resistivity decreased by two orders of magnitude with Al doping. As a result, the sample with an aluminum concentration of approximately 1% had the lowest resistivity. In this work, it was possible to relate the lower resistivity with larger grain size and smaller concentrations of defects or vacancies.

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“…According to the literature, metal zinc coatings can be obtained by electroplating from aqueous or non-aqueous electrolytes. Generally, when an aqueous electrolyte is applied, lower current efficiency is observed which is caused by hydrogen production in the over-potential [12]. Also, Zn(OH) 2 is formed competing with ZnO oxide formation during electrodeposition in aqueous electrolytes.…”

Section: Introductionmentioning

confidence: 99%

“…It is noticeable that only in a few works the development of ZnO coatings has been performed by electrochemical deposition of zinc compounds from non-aqueous electrolytic baths [12][13][14][15][16]. The established results concerning the optimal grain size, film thickness and resulting composition are not detailed for non-aqueous electrolytic baths or contradict each other [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Galvanic synthesis of ZnO and ZnO(Al) coatings from dimethylsulfoxide electrolytic baths

Мартынова

Лепнев

Tsymbarenko

et al. 2023

JAMT

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Electrochemical formation of transparent semiconductive oxide (TSO) coatings based on zincite is an attractive, versatile and easily scalable method,which is promising for optoelectronics and chemical sensors. The complexity of the formation of zinc oxide and doped compounds such as ZnO(Al) coatings by electrochemical co-precipitation of zinc and aluminum compounds in aqueous media is connected with both different redox potentials of two metals and the formation of galvanic precipitates of significantly hydrated zinc and aluminum oxides. Application of non-aqueous media for zinc electrolytes can form a bimetallic deposit for the following gently oxidation to oxide (AZO). In the present study, dimethylsulfoxide (DMSO) is applied as a solvent. It is shown that the specifics of nucleation of zincite phase in DMSO electrolytes results in more porous coatings in comparison to the processes in aqueous plating solutions. Here, compositions of non-aqueous electrolytes and corresponding deposition potentials in potentiostatic mode have been optimized. The correlations of microstructure and elemental composition of the coatings with parameters of galvanic process have been studied. The presence aluminum at the surface of the samples in two different valent states have been shown using X-ray photoelectron spectroscopy. This is the result of the deficiency of wurtzite structure and the presence of γ-Al 2 O 3 phases, most likely, resulted from segregation. It is shown that the developed synthesis method is promising for direct synthesis of porous coatings of zincite with a variable deficiency of the structure.

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Electrochemical Coprecipitation of Zinc and Aluminum in Aqueous Electrolytes for ZnO and AZO Coverage Deposition

Cited by 7 publications

References 25 publications

Electrochemicaly formed ZnO and Au/ZnO opal films

Electrochemicaly formed ZnO and Au/ZnO opal films

Versatile r.f. magnetron sputtering doping method to produce aluminum‐doped zinc oxide films

Galvanic synthesis of ZnO and ZnO(Al) coatings from dimethylsulfoxide electrolytic baths

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