Efficient solar photocatalytic activity of TiO2 coated nano-porous silicon by atomic layer deposition

2016 ◽  
Vol 97 ◽  
pp. 155-166 ◽  
Author(s):  
Sridhar Sampath ◽  
Philipp Maydannik ◽  
Tatiana Ivanova ◽  
Marina Shestakova ◽  
Tomáš Homola ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Porous Silicon ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Layer Deposition ◽  
Solar Photocatalytic Activity

scholarly journals Porous Silicon-Zinc Oxide Nanocomposites Prepared by Atomic Layer Deposition for Biophotonic Applications

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1987 ◽  
Author(s):  
Mykola Pavlenko ◽  
Valerii Myndrul ◽  
Gloria Gottardi ◽  
Emerson Coy ◽  
Mariusz Jancelewicz ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Porous Silicon ◽  
Atomic Layer Deposition ◽  
Photoelectron Spectroscopy ◽  
Atomic Layer ◽  
Visible Range ◽  
Optical Biosensing ◽  
X Ray ◽  
Layer Deposition

In the current research, a porous silicon/zinc oxide (PSi/ZnO) nanocomposite produced by a combination of metal-assisted chemical etching (MACE) and atomic layer deposition (ALD) methods is presented. The applicability of the composite for biophotonics (optical biosensing) was investigated. To characterize the structural and optical properties of the produced PSi/ZnO nanocomposites, several studies were performed: scanning and transmission electron microscopy (SEM/TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance, and photoluminescence (PL). It was found that the ALD ZnO layer fully covers the PSi, and it possesses a polycrystalline wurtzite structure. The effect of the number of ALD cycles and the type of Si doping on the optical properties of nanocomposites was determined. PL measurements showed a “shoulder-shape” emission in the visible range. The mechanisms of the observed PL were discussed. It was demonstrated that the improved PL performance of the PSi/ZnO nanocomposites could be used for implementation in optical biosensor applications. Furthermore, the produced PSi/ZnO nanocomposite was tested for optical/PL biosensing towards mycotoxins (Aflatoxin B1) detection, confirming the applicability of the nanocomposites.

scholarly journals Ultrafast triggered transient energy storage by atomic layer deposition into porous silicon for integrated transient electronics

Nanoscale ◽  
2016 ◽  
Vol 8 (14) ◽  
pp. 7384-7390 ◽  
Author(s):  
Anna Douglas ◽  
Nitin Muralidharan ◽  
Rachel Carter ◽  
Keith Share ◽  
Cary L. Pint
Keyword(s):  
Energy Storage ◽  
Porous Silicon ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Layer Deposition ◽  
Transient Energy ◽  
Transient Electronics

scholarly journals Multitarget Evaluation of the Photocatalytic Activity of P25-SiO2 Prepared by Atomic Layer Deposition

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 450 ◽  
Author(s):  
Miguel Martín-Sómer ◽  
Dominik Benz ◽  
J. Ruud van Ommen ◽  
Javier Marugán
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Atomic Layer Deposition ◽  
Photocatalytic Oxidation ◽  
Atomic Layer ◽  
Bacterial Inactivation ◽  
Photocatalytic Efficiency ◽  
Term Operation ◽  
Oxidation Of Methanol ◽  
Layer Deposition

This work presents the evaluation of the photocatalytic activity of P25 TiO2 particles, coated with SiO2, using atomic layer deposition (ALD) for the photocatalytic removal of methylene blue, oxidation of methanol and inactivation of Escherichia coli bacteria in water and its comparative evaluation with bare P25 TiO2. Two different reactor configurations were used, a slurry reactor with the catalyst in suspension, and a structured reactor with the catalyst immobilized in macroporous foams, that enables the long-term operation of the process in continuous mode, without the necessity of separation of the particles. The results show that the incorporation of SiO2 decreases the efficiency of the photocatalytic oxidation of methanol, whereas a significant improvement in the removal of methylene blue is achieved, and no significant changes are observed in the photocatalytic inactivation of bacteria. Adsorption tests showed that the improvements, observed in the removal of methylene blue by the incorporation of SiO2, was mainly due to an increase in its adsorption. The improvement in the adsorption step as part of the global photocatalytic process led to a significant increase in its removal efficiency. Similar conclusions were reached for bacterial inactivation where the loss of photocatalytic efficiency, suggested by the methanol oxidation tests, was counteracted with a better adherence of bacteria to the catalyst that improved its elimination. With respect to the use of macroporous foams as support, a reduction in the photocatalytic efficiency is observed, as expected from the decrease in the available surface area. Nevertheless, this lower efficiency can be counteracted by the operational improvement derived from the easy catalyst reuse.

scholarly journals Effects of Anodic Aluminum Oxide Substrate Pore Geometry on the Gas-Phase Photocatalytic Activity of ZnO/Al2O3 Composites Prepared by Atomic Layer Deposition

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1456
Author(s):  
Bozhidar I. Stefanov ◽  
Blagoy S. Blagoev ◽  
Lars Österlund ◽  
Boriana R. Tzaneva ◽  
George V. Angelov
Keyword(s):  
Photocatalytic Activity ◽  
Atomic Layer Deposition ◽  
Aluminum Oxide ◽  
Gas Phase ◽  
Anodic Aluminum Oxide ◽  
Photocatalytic Oxidation ◽  
Atomic Layer ◽  
Anodic Aluminum ◽  
Layer Deposition ◽  
Oxide Substrate

We report on the photocatalytic activity of ZnO layers deposited by atomic layer deposition on a porous anodic aluminum oxide substrate with hexagonal pore symmetry and varied pore dimensions. ZnO/Al2O3 composites were prepared with pore diameters in the range 93–134 nm and interpore distance in the range 185–286 nm, and their photocatalytic activity was measured for gas-phase photocatalytic oxidation of acetaldehyde at varying UV illumination intensities (0.08–3.94 mW cm−2). The results show that substrates with narrower pore diameters (<115 nm, in the case of this study) have a detrimental effect on the photocatalyst performance, despite their higher effective surface. The results are explained on the basis of limited mass transfer inside the porous structure and can be used as a guideline in the purposeful design of photocatalysts with a nanoporous or nanotubular structure.

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