Self-Ordering Regimes of Porous Anodic Alumina Layers Formed in Highly Diluted Sulfuric Acid Electrolytes

Pashchanka, Mikhail; Schneider, Jörg J.

doi:10.1021/acs.jpcc.5b11801

Cited by 31 publications

(35 citation statements)

References 35 publications

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“…The linear correlation of the cell size (or ( ) interpore distance, D int ) and the anodizing potential is shown in figure 2.b and 2.c in various electrolytes. Nevertheless, there is a discrepancy in the effect that temperature 95,[98][99][100] , and electrolyte pH 95,97,[101][102][103] (electrolyte concentration) have on both structural parameters. The major differences arise from comparing different electrolytic solutions.…”

Section: Aao Porous Structurementioning

confidence: 99%

Revisiting anodic alumina templates: from fabrication to applications

2021

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Section: Aao Porous Structurementioning

confidence: 99%

Revisiting anodic alumina templates: from fabrication to applications

2021

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“…Its geometrical parameters, such as interpore distance ( D c ) and pore diameter ( D p ), can be controlled by electrochemical conditions including type and concentration of electrolyte, temperature, applied voltage, and anodization time [ 1 , 2 ]. PAA with long-range hexagonally ordered and parallel pores is usually formed under self-ordering regimes, which are defined by narrow process windows characteristic for a given electrolyte [ 3 , 4 ]. Out of these regimes, the pore arrangement strongly deteriorates.…”

Section: Introductionmentioning

confidence: 99%

Influence of Anodization Temperature on Geometrical and Optical Properties of Porous Anodic Alumina(PAA)-Based Photonic Structures

2020

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In this work, the influence of a wide range anodizing temperature (5–30 °C) on the growth and optical properties of PAA-based distributed Bragg reflector (DBR) was studied. It was demonstrated that above 10 °C both structural and photonic properties of the DBRs strongly deteriorates: the photonic stop bands (PSBs) decay, broaden, and split, which is accompanied by the red shift of the PSBs. However, at 30 °C, new bands in transmission spectra appear including one strong and symmetric peak in the mid-infrared (MIR) spectral region. The PSB in the MIR region is further improved by a small modification of the pulse sequence which smoothen and sharpen the interfaces between consecutive low and high refractive index layers. This is a first report on PAA-based DBR with a good quality PSB in MIR. Moreover, it was shown that in designing good quality DBRs a steady current recovery after subsequent application of high potential (UH) pulses is more important than large contrast between low and high potential pulses (UH-UL contrast). Smaller UH-UL contrast helps to better control the current evolution during pulse anodization. Furthermore, the lower PSB intensity owing to the smaller UH-UL contrast can be partially compensated by the higher anodizing temperature.

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“…The AAO template is a self-assembled nanoporous film in which the pore size and the distribution are influenced by the working voltage, electrolyte compositions, and other parameters [ 18 , 19 , 20 , 21 ]. In the present work, the AAO template was produced on the ITO glass in 0.3 M oxalic acid solution at 40 V. Figure 4 a showed the surface morphology of the AAO template after a pore widening process using 5% phosphoric acid solution.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of a P3HT-ZnO Nanowires Gas Sensor Detecting Ammonia Gas

Kuo

Chen

Chao

et al. 2017

Sensors

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In this study, an organic-inorganic semiconductor gas sensor was fabricated to detect ammonia gas. An inorganic semiconductor was a zinc oxide (ZnO) nanowire array produced by atomic layer deposition (ALD) while an organic material was a p-type semiconductor, poly(3-hexylthiophene) (P3HT). P3HT was suitable for the gas sensing application due to its high hole mobility, good stability, and good electrical conductivity. In this work, P3HT was coated on the zinc oxide nanowires by the spin coating to form an organic-inorganic heterogeneous interface of the gas sensor for detecting ammonia gas. The thicknesses of the P3HT were around 462 nm, 397 nm, and 277 nm when the speeds of the spin coating were 4000 rpm, 5000 rpm, and 6000 rpm, respectively. The electrical properties and sensing characteristics of the gas sensing device at room temperature were evaluated by Hall effect measurement and the sensitivity of detecting ammonia gas. The results of Hall effect measurement for the P3HT-ZnO nanowires semiconductor with 462 nm P3HT film showed that the carrier concentration and the mobility were 2.7 × 1019 cm−3 and 24.7 cm2∙V−1∙s−1 respectively. The gas sensing device prepared by the P3HT-ZnO nanowires semiconductor had better sensitivity than the device composed of the ZnO film and P3HT film. Additionally, this gas sensing device could reach a maximum sensitivity around 11.58 per ppm.

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Self-Ordering Regimes of Porous Anodic Alumina Layers Formed in Highly Diluted Sulfuric Acid Electrolytes

Cited by 31 publications

References 35 publications

Revisiting anodic alumina templates: from fabrication to applications

Revisiting anodic alumina templates: from fabrication to applications

Influence of Anodization Temperature on Geometrical and Optical Properties of Porous Anodic Alumina(PAA)-Based Photonic Structures

Fabrication of a P3HT-ZnO Nanowires Gas Sensor Detecting Ammonia Gas

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