Prepared σ-MnO2 thin films by chemical bath deposition methods and study of its optical and microstructure properties

Astinchap, Bandar; Moradian, Rostam; Namdari, Tahereh; Jurečka, Stanislav; Ţălu, Ștefan

doi:10.1007/s11082-019-1891-z

Cited by 11 publications

(4 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where the singularity strengths are given by α max and α min , which are the most and least singular, respectively [34,35]. The surfaces of POEA displays decrease in multifractality strength with increasing cycles, as observed in Table 4.…”

Section: Multifractal Analysismentioning

confidence: 80%

Vertical Growth Dynamics and Multifractality of the Surface of Electropolymerized Poly(o-ethoxyaniline) Thin Films

et al. 2022

Self Cite

View full text Add to dashboard Cite

Electropolymerized poly(o-ethoxyaniline) (POEA) nanostructured thin films were successfully deposited on indium tin oxide (ITO) substrate. The surface dynamic of the films was extensively investigated using morphological and multifractal parameters extracted from the atomic force microscopy (AFM). AFM topographical maps reveal surfaces with different morphologies as a function of the deposition cycles. The height parameters show that there is greater spatial vertical growth for films deposited with higher cycles of deposition. After five cycles of deposition occurs the formation of a more isotropic surface, while for 15 cycles a less isotropic surface is observed. The Minkowski functionals confirm that morphological aspects of the two films change according to the amount of deposition cycles employed. The POEA surfaces also exhibit a strong multifractal nature with a decrease in the multifractal spectrum width as the number of deposition cycles increases. Our findings prove that deposition cycles can be useful in controlling the vertical growth and surface dynamics of electropolymerized POEA nanostructured samples, which can be useful for improving the fabrication of POEA-coated ITO-based devices.

show abstract

Section: Multifractal Analysismentioning

confidence: 80%

Vertical Growth Dynamics and Multifractality of the Surface of Electropolymerized Poly(o-ethoxyaniline) Thin Films

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Nanostructured transition metal oxide thin films have attracted the attention of researchers and industry due to their unique physical and chemical properties [1][2][3][4]. Their special properties are because of the finite size and high surface to volume ratio.…”

Section: Introductionmentioning

confidence: 99%

The effect of deposition angle and thickness on structural and optical properties of manganese oxide thin films

2022

View full text Add to dashboard Cite

Manganese oxide thin films were deposited on glass substrates by resistive evaporation at room temperature. The layers were produced with electron gun evaporation method under ultra-high vacuum condition. Thickness of the layers was measured 60 and 120 nm, by a quartz crystal method. Deposition conditions such as deposition rate, vacuum pressure, incidence of angle and substrate temperature were the same for all layers. After producing pure manganese oxide layers a post-annealing method was used in the presence of a uniform oxygen flow of 300 (sccm) and at 320 o C annealing temperature. Optical reflectance and transmittance of the layers were measured in the wavelength of 350-850 nm by a spectrophotometer. Kramers-Kronig relations were used to calculate the optical constant. The influence of annealing temperature and oxygen flow on optical properties is investigated. It was found that film thickness and deposition angle plays an important role on the nanostructures as well as optical properties of layers and cause significant variations in behavior of thin titanium oxide films. The physical properties of materials were characterized by X-ray diffraction (XRD), FE-SEM, AFM, EDX, and UV-Vis techniques.

show abstract

“…A wide range of modern preparative chemistry methods are used for the synthesis of this substance, including the hydrothermal method, 16 solid-state reaction technique, 17 electrochemical deposition, 18 successive ionic layer deposition, 19 sol–gel, 20 precipitation, 21 chemical bath deposition, 22 etc.…”

Section: Introductionmentioning

confidence: 99%

Formation of Ordered Honeycomb-like Structures of Manganese Oxide 2D Nanocrystals with the Birnessite-like Structure and Their Electrocatalytic Properties during Oxygen Evolution Reaction upon Water Splitting in an Alkaline Medium

2019

View full text Add to dashboard Cite

In this work, a chemical reaction between gaseous ozone and aqueous solution of Mn(CH3COO)2 in drops has been researched. It has been shown that the formation of HxMnO2·nH2O nanocrystals with a morphology of nanosheets and a birnessite-like crystal structure with a thickness of 5–8 nm is observed on the surface of drops. These nanocrystals are oriented spontaneously to the solution–gas interface and constitute peculiar ribbons with a width of 1–2 μm, some of which form ordered honeycomb structures (OHS) with a 5–20 μm cell size. To explain the observed effect, the scheme of chemical reactions that take place at the interface between the surface of a drop and ozone has been modeled, and it can be described using a diffusion pattern model taking into account the action of “force fields” on the surface of a drop, which arise due to its curvature. After the drop is dried, these structures practically retain their morphology and form a fractal structure with a geometric area equal to the area of the drop base on the surface of the substrate. The study of the electrocatalytic properties of these structures revealed that they are active electrocatalysts in the oxygen evolution reaction (OER) during water electrolysis in alkaline medium. The most efficient of the obtained electrocatalysts are characterized by an overpotential value of 284 mV at a current of 10 mA/cm2 and the Tafel coefficient of 37.7 mV/dec and are currently one of the best among pure manganese oxides. Finally, it has also been assumed that this effect is explained by the morphological features of the structures obtained, which contribute to the removal of oxygen bubbles from the electrode surface during electrolysis.

show abstract

Prepared σ-MnO2 thin films by chemical bath deposition methods and study of its optical and microstructure properties

Cited by 11 publications

References 40 publications

Vertical Growth Dynamics and Multifractality of the Surface of Electropolymerized Poly(o-ethoxyaniline) Thin Films

Vertical Growth Dynamics and Multifractality of the Surface of Electropolymerized Poly(o-ethoxyaniline) Thin Films

The effect of deposition angle and thickness on structural and optical properties of manganese oxide thin films

Formation of Ordered Honeycomb-like Structures of Manganese Oxide 2D Nanocrystals with the Birnessite-like Structure and Their Electrocatalytic Properties during Oxygen Evolution Reaction upon Water Splitting in an Alkaline Medium

Contact Info

Product

Resources

About