Optical characterization of high-quality ZnO (0002) / Cu (111) epilayers grown by electrodeposition

Nedzinskas, Ramūnas; Suchodolskis, A.; Trinkler, L.; Krieķe, Guna; Yao, Wan-Tung; Chang, Chia‐Cheng; Chang, Liuwen; Chou, Ming-Shean

doi:10.1016/j.optmat.2023.113650

Cited by 2 publications

(4 citation statements)

References 27 publications

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“…We proposed to grow ZnO nanostructures by electrodeposition on Ni foam, a low cost and simple technique that had proved to be successful in obtaining ZnO films on different flat substrates like ITO and FTO [40][41][42][43].…”

Section: Methodsmentioning

confidence: 99%

“…What is interesting about the latter is the simple scalability, film control, and the possibility of depositing structures in many different shapes and sizes without using high temperatures or expensive equipment. Growth can be carried out through various solutions that use Zn 2+ salts with different anions, whether chlorides, nitrates or sulfates, as precursors [43][44][45][46][47][48]. By varying the type, concentration or pH of these solutions, as well as the applied potential, the deposition time or the current circulating in the cell, various types of ZnO films and morphologies can be obtained [49][50][51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced photocatalytic performance by ZnO/Graphene heterojunction grown on Ni foam for methylene blue removal

Melia,

Gallegos,

Juncal

et al. 2024

Charact. Appl. Nanomater.

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ZnO nanostructures were obtained by electrodeposition on Ni foam where graphene was previously grown by chemical vapor deposition (CVD). The resulting heterostructures were characterized by X-ray diffraction and SEM microscopy and their potential application as a catalyst for the photodegradation of methylene blue (MB) was evaluated. The incorporation of graphene to the Ni substrate increases the amount of deposited ZnO at low potentials in comparison to bare Ni. SEM images show homogeneous growth of ZnO on Ni/G but not on bare Ni foam. A percent removal of almost 60% of MB was achieved by the Ni/G/ZnO sample, which represents a double quantity than the other catalysts proved in this work. The synergistic effects of ZnO-graphene heterojunctions play a key role in achieving better adsorption and photocatalytic performance. The results demonstrate the ease of depositing ZnO on seedless graphene by electrodeposition. The use of the film as a photocatalyst delivers interesting and competitive removal percentages for a potentially scalable degradation process enhanced by a non-toxic compound such as graphene.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic performance by ZnO/Graphene heterojunction grown on Ni foam for methylene blue removal

Melia,

Gallegos,

Juncal

et al. 2024

Charact. Appl. Nanomater.

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show abstract

“…The technique even allows doping the films directly on the growth with elements such as Al, [41,42] In [42] or Mn [43] . One of the possibilities offered by the technique is to obtain ZnO using different sources of Zn 2+ : there are reports using Zn(NO 3 ) 2, [44,45] ZnCl 2, [46,47] and Zn(SO 4 ) 2 [48,49] …”

Section: Introductionmentioning

confidence: 99%

“…The technique even allows doping the films directly on the growth with elements such as Al, [41,42] In [42] or Mn. [43] One of the possibilities offered by the technique is to obtain ZnO using different sources of Zn 2 + : there are reports using Zn(NO 3 ) 2, [44,45] ZnCl 2, [46,47] and Zn(SO 4 ) 2 . [48,49] Regarding the raw materials used in this work, the consumption of alkaline batteries has increased, and the final disposal of depleted batteries represents a growing environmental problem.…”

Section: Introductionmentioning

confidence: 99%

Growth of ZnO thin Films from Depleted Batteries for Water Remediation

Melia,

Gallegos,

Juncal

et al. 2024

ChemistrySelect

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ZnO films were obtained by electrodeposition technique from commercial Zn2+ solutions and those obtained from spent alkaline batteries. The type of counterion and pH impact directly on the structural, morphological, and optical properties of the electrodeposited ZnO films. The morphological and crystallographic orientation differences observed by X‐ray diffraction (XRD) analysis and high‐resolution field emission scanning electron microscopy (HR‐FESEM), demonstrates the influence of the type and origin of precursors used in the ZnO synthesis process. Those samples grown from commercial nitrate solutions exhibit nanocolumns revealing a preferential growth in the (002) direction. On the other hand, random growth (hexagonal plates, agglomerations, clusters, etc.) is observed in samples obtained through recycled solutions. All deposited samples achieved a transparency close to 80 % and an optical band gap of around 3.30 eV. The as‐deposited films were evaluated toward the photodegradation capacity of methylene blue (MB) for potential technological applications. Results exhibit that samples prepared from recycled ZnCl2 solutions presented more than 80 % degradation per mass of ZnO. This work demonstrates a virtuous circle since ZnO films are deposited by a facile and scalable technique from discarded batteries and used for MB photodegradation. Furthermore, the simplicity of recovery of these substrates after application makes them an attractive and pragmatic option for a range of water treatment applications. Synopsis: Zinc from depleted alkaline batteries is reused to obtain ZnO thin films that remove contaminating dyes from water.

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Optical characterization of high-quality ZnO (0002) / Cu (111) epilayers grown by electrodeposition

Cited by 2 publications

References 27 publications

Enhanced photocatalytic performance by ZnO/Graphene heterojunction grown on Ni foam for methylene blue removal

Enhanced photocatalytic performance by ZnO/Graphene heterojunction grown on Ni foam for methylene blue removal

Growth of ZnO thin Films from Depleted Batteries for Water Remediation

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