Anodic luminescence, structural, photoluminescent, and photocatalytic properties of anodic oxide films grown on niobium in phosphoric acid

Stojadinović, Stevan; Tadić, Nenad; Radić, Nenad; Stefanov, P.; Grbić, Boško; Vasilić, Rastko

doi:10.1016/j.apsusc.2015.07.174

Cited by 36 publications

(18 citation statements)

References 37 publications

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“…The increase in intermediate states in the region of the sample gap implies less energetic transitions that result in emission with longer wavelengths, that is, lower band gap values. The centers of the PL bands for niobium oxides refer to structural distortions associated with possible oxygen vacancies, contributing to photoactivity and increase in PL intensity . All the Nb 2 O 5 samples presented similar characteristics in terms of photoluminescence.…”

Section: Resultsmentioning

confidence: 98%

Investigation of the properties of niobium pentoxide for use in dye‐sensitized solar cells

et al. 2018

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This work demonstrates the obtention of Nb2O5 nanoparticles by the microwave‐assisted hydrothermal synthesis method in a fast way and with the use of low temperatures. The heat treatment applied on the samples promotes the phase change in Nb2O5 from pseudohexagonal to orthorhombic as the temperature increases, with a particle size between 7.3 and 32.6 nm. The band gap of the samples decreases with increasing temperature, obtaining a minimum value of 3.04 eV at 800°C. Dye‐sensitized solar cells (DSSC) were assembled using the Doctor Blade coating technique. The photovoltaic parameters of open‐circuit voltage (Voc) and short‐circuit current density (Jsc) were evaluated. The cells showed a photovoltaic response, demonstrating that Nb2O5 has a semiconductive potential. The DSSC have different characteristics regarding Jsc and Voc, showing that according to the temperature increase in the semiconductor sample, there is a decrease in the photovoltaic parameters of the cells.

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Section: Resultsmentioning

confidence: 98%

Investigation of the properties of niobium pentoxide for use in dye‐sensitized solar cells

et al. 2018

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“…However, the metals put here into the central group (Cr, Nb, Ta and V) are of interest. Information about PEO of them is limited, although there have been reports of successful processing for both Nb [162][163][164][165][166][167] and Ta [29,168]. (Some further information about PEO of Ta is provided in Section 'PEO discharge characteristics for various metals'.)…”

Section: Thermodynamics Of Oxidation During Peomentioning

confidence: 99%

A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals

Clyne

Troughton

2018

International Materials Reviews

434

225

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The review describes recent progress on understanding and quantification of the various phenomena that take place during plasma electrolytic oxidation, which is in increasing industrial use for production of protective coatings and other surface treatment purposes. A general overview of the process and some information about usage of these coatings are provided in the first part of the review. The focus is then on the dielectric breakdown that repeatedly occurs over the surface of the work-piece. These discharges are central to the process, since it is largely via the associated plasmas that oxidation of the substrate takes place and the coating is created. The details are complex, since the discharge characteristics are affected by a number of processing variables. The interrelationships between electrical conditions, electrolyte composition, coating microstructure and rates of growth, which are linked via the characteristics of the discharges, have become clearer over recent years and these improvements in understanding are summarised here. There is considerable scope for more effective process control, with specific objectives in terms of coating performance and energy efficiency, and an attempt is made to identify key points that are likely to assist this.

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“…3,11,15,19 The spectral line shape analyses of hydrogen Balmer lines or ion lines from the substrate have often been used to estimate the electron number density. 3,6,7,11,12,33 The molecular vibrational temperature was determined from the B 2 Σ + →X 2 Σ + emission transition of AlO, 13,20 and the B 1 Σ + →X 1 Σ + emission transition of MgO. 14,20,29 The present paper describes PEO process of Al-Zn-Si alloy (a nominal composition of 55 % aluminum, 43.5 % zinc and 1.5 % silicon) in sodium metasilicate.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic study of micro-discharges during plasma electrolytic oxidation of Al-Zn-Si alloy

Stojadinović

Vasilić

2019

J Serb Chem Soc

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Plasma electrolytic oxidation (PEO) process of Al-Zn-Si alloy in water solution containing 4 g L-1 sodium metasilicate at constant current density of 400 mA cm −2 was investigated. The species present in PEO micro-discharges and their ionization stages were identified using optical emission spectroscopy technique. The obtained PEO spectrum consists of atomic/ionic lines originating from the elements present both in the substrate (Al, Zn) and the electrolyte (Na, O, H). Apart from atomic and ionic lines, AlO band at 484.2 nm was also detected. Plasma electron number density diagnostics was performed from the H β line shape. The electron temperature of 4000±400 K was estimated by measuring the relative line intensities of zinc atomic lines at 481.05 and 636.23 nm. In addition, surface morphology, chemical and phase composition of oxide coatings were investigated by SEM-EDS and XRD. Oxide coating morphology is strongly dependent of PEO time. The elemental components of PEO coatings are Al, Zn, O and Si. The oxide coatings are partly crystallized and mainly composed of gamma phase of Al 2 O 3 .

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Anodic luminescence, structural, photoluminescent, and photocatalytic properties of anodic oxide films grown on niobium in phosphoric acid

Cited by 36 publications

References 37 publications

Investigation of the properties of niobium pentoxide for use in dye‐sensitized solar cells

Investigation of the properties of niobium pentoxide for use in dye‐sensitized solar cells

A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals

Spectroscopic study of micro-discharges during plasma electrolytic oxidation of Al-Zn-Si alloy

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