Electrochemical synthesis and characterization of dark nanoporous zinc oxide films

Mika, Krystyna; Socha, Robert P.; Nyga, Piotr; Wiercigroch, Ewelina; Malek, Kamilla; Jarosz, Magdalena; Uchacz, Tomasz; Zaraska, Leszek

doi:10.1016/j.electacta.2019.03.052

Cited by 40 publications

(21 citation statements)

References 47 publications

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“…[52] Mika et al produced such a nanoporous (dark) layer in a 1 M NaOH electrolyte between 2 V and 4 V (t A = 30 minutes). [82] Bicarbonate (HCO 3 À ) as electrolyte. In bicarbonate-based electrolytes, primary hierarchical structures of ZnO nanoneedles are observed in a floral structure (Figure 7).…”

Section: Influence Of Electrolytementioning

confidence: 99%

“…These AZO layers also show a nanoporous structure. [82] Imam et al observed two colors in various sodium silicatebased mixed electrolytes called "good" and "bad" coatings. It was indicated that "bright silver" AZO layers exhibit a strong adhesion while the "uniform dark" color leads to less adhesion.…”

Section: Colors Of Azo Layersmentioning

confidence: 99%

“…Mika et al. produced such a nanoporous (dark) layer in a 1 M NaOH electrolyte between 2 V and 4 V ( t A =30 minutes) [82] …”

Section: Influence Of Electrolytementioning

confidence: 99%

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Zinc Anodizing: Structural Diversity of Anodic Zinc Oxide Controlled by the Type of Electrolyte

et al. 2021

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Anodic zinc oxide (AZO) layers are attracting interdisciplinary research interest. Chemists, physicists and materials scientists are increasingly devoting attention to fundamental and application‐related research on these layers. Research work focuses on the application as semiconductor, corrosion protector, adhesion promoter, abrasion protector, or antibacterial surfaces. The structure and crystallinity essentially determine the properties of the AZO coatings. The type and concentration of the electrolyte, the applied current density or voltage as well as the duration time enable layer structures of structural variety. The article gives an overview of the different possibilities of anodic treatment, whereby the voltage and the current type are the main distinguishing criteria. Presented is the electrolytic oxidation (anodizing) and the electrolytic plasma oxidation (EPO). The electrolytic etching is also a process of anodic treatment. However, it does not produce AZO layers, but rather a degradation of the zinc layer. The review article shows the parameters used so far (electrolyte, current type, current density, voltage) and points out the influence on the formation of AZO structures in dependency to the used electrolyte.

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Section: Influence Of Electrolytementioning

confidence: 99%

Section: Colors Of Azo Layersmentioning

confidence: 99%

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Zinc Anodizing: Structural Diversity of Anodic Zinc Oxide Controlled by the Type of Electrolyte

et al. 2021

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“…Anodic oxides are the group of materials which can be described as layered material made on the top of valve metal (like Al, Ti, Zn, Sn, W, etc. [42][43][44][45][46][47]) or its alloy (like Ti6Al7Nb, FeAl, etc. [48][49][50][51]) by electrooxidation, called anodization.…”

Section: Anodic Oxides Used As a Sers Substratementioning

confidence: 99%

An Overview of Anodic Oxides Derived Advanced Nanocomposites Substrate for Surface Enhance Raman Spectroscopy

Michalska-Domańska¹

2020

Assorted Dimensional Reconfigurable Materials

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Surface-enhanced Raman spectroscopy (SERS) is an analytical technique, which allows to identify traces of chemical or biological substances in many field, like pharmaceutical and food industries, homeland security, nanosensors, or environmental protection. The analytes are identified based on their vibrational spectra, unique for a given compound. The advantage of SERS is effective qualitative analysis of trace amounts of analyte, but the disadvantages are stability of substrate and repeatability of measurements. The challenge is to improve SERS substrates to minimize these drawbacks. Nowadays high-precision electron beam lithography or focused ion beam is used in SERS substrate fabrication, which is impractical for large-scale production. In recent years, researchers' attention has focused on porous anodic oxides, with inexpensive and scalable production method, as potential materials for SERS substrates. This chapter will discuss the progress of anodic oxides used as a SERS substrate, and the brief description of conventional SERS substrate fabrication methods will be presented.

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“…One of the most widely used methods is electrochemical oxidation of metals, known as anodization resulting in the formation of the oxide film on a particular metal or alloy [ 7 , 8 ]. It has been intensively studied with respect to aluminum [ 9 ], titanium [ 8 ], tungsten [ 10 ], tin [ 11 ], and zinc [ 12 ] in the past few decades. However, it is often used to modify different alloys’ surfaces to obtain mixed oxides offering many promising properties [ 5 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Oxidation of Ti15Mo Alloy—The Impact of Anodization Parameters on Surface Morphology of Nanostructured Oxide Layers

et al. 2020

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It is well-known that the structure and composition of the material plays an important role in the processes occurring at the surface. In this paper, a surface morphology of nanostructured oxide layers electrochemically grown on Ti15Mo, tuned by applying different anodization parameters, was investigated in detail. The one-step anodization of Ti15Mo alloy was performed at room temperature in an ethylene glycol-based electrolyte containing 0.11 M NH4F and 1.11 M H2O. Different anodization times (ranging from 5 to 60 min) and applied potentials (40–100 V) were tested, and the surface morphology, elemental content, and crystalline structure were monitored by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), and X-ray diffractometry (XRD), respectively. The results showed that contrary to the multistep anodization of titanium foil, the surface morphology of anodic oxide obtained via the one-step process contains the nanoporous outer layer covering the nanotubular structure. What is more, the pore diameter (Dp) and interpore distance (Dint) of such layers exhibit different trends than those observed for anodization of pure titanium. In particular, at a certain potential range, a decrease in both Dp and Dint with increasing potential was observed. However, independently on the used anodization conditions, the elemental content of oxide layers remained similar, showing the amount of molybdenum at c.a. 15 wt.%. Finally, the amorphous nature of as-anodized layers was confirmed, and their optical band-gap was determined from the diffuse reflectance UV–Vis spectra. It was found that Eg is tunable to some extent by changing the anodizing potential. However, further thermal treatment in air at 400 °C resulted in the anatase phase formation that was accompanied by a significant Eg reduction. Therefore, we believe that the presented results will greatly contribute to the understanding of anodic formation of nanostructured functional oxide layers with tunable properties that can be applied in various fields.

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Electrochemical synthesis and characterization of dark nanoporous zinc oxide films

Cited by 40 publications

References 47 publications

Zinc Anodizing: Structural Diversity of Anodic Zinc Oxide Controlled by the Type of Electrolyte

Zinc Anodizing: Structural Diversity of Anodic Zinc Oxide Controlled by the Type of Electrolyte

An Overview of Anodic Oxides Derived Advanced Nanocomposites Substrate for Surface Enhance Raman Spectroscopy

Electrochemical Oxidation of Ti15Mo Alloy—The Impact of Anodization Parameters on Surface Morphology of Nanostructured Oxide Layers

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