Graphene films decorated with TiO2 grown by atomic layer deposition: Characterization and photocatalytic activity study under UV–visible light

2019 ◽  
Vol 470 ◽  
pp. 484-495 ◽  
Author(s):  
Francesca Marchetti ◽  
Nadhira Laidani ◽  
Marina Scarpa ◽  
Gloria Gottardi ◽  
Enrico Moser
Keyword(s):  
Photocatalytic Activity ◽  
Atomic Layer Deposition ◽  
Visible Light ◽  
Atomic Layer ◽  
Graphene Films ◽  
Layer Deposition ◽  
Uv Visible

scholarly journals Mesoporous TiO2 anatase films for enhanced photocatalytic activity under UV and visible light

RSC Advances ◽  
2020 ◽  
Vol 10 (63) ◽  
pp. 38233-38243
Author(s):  
Olga M. Ishchenko ◽  
Guillaume Lamblin ◽  
Jérôme Guillot ◽  
Ingrid C. Infante ◽  
Maël Guennou ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Atomic Layer Deposition ◽  
Visible Light ◽  
Room Temperature ◽  
Atomic Layer ◽  
Mesoporous Tio2 ◽  
Tio2 Anatase ◽  
Visible Wavelength ◽  
Layer Deposition

Mesoporous TiO2 films with enhanced photocatalytic activity in both UV and visible wavelength ranges were developed through a non-conventional atomic layer deposition (ALD) process at room temperature.

Improving the photodetection and stability of a visible-light QDs/ZnO phototransistor via an Al2O3 additional layer

2021 ◽  
Author(s):  
Sungho Park ◽  
Byung Jun Kim ◽  
Tae Yeon Kim ◽  
Eui Young Jung ◽  
Kyu-Myung Lee ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Atomic Layer Deposition ◽  
Quantum Dot ◽  
Aluminum Oxide ◽  
Thin Layer ◽  
Visible Light ◽  
Atomic Layer ◽  
Zno Films ◽  
Additional Layer ◽  
Layer Deposition

We have developed a visible-light phototransistor with excellent photodetection characteristics and stability via atomic layer deposition (ALD) to add a thin layer of aluminum oxide (Al2O3) to quantum dot (QD)/zinc oxide (ZnO) films.

Self-Assembly Based Plasmonic Arrays Tuned by Atomic Layer Deposition for Extreme Visible Light Absorption

Nano Letters ◽  
2013 ◽  
Vol 13 (7) ◽  
pp. 3352-3357 ◽  
Author(s):  
Carl Hägglund ◽  
Gabriel Zeltzer ◽  
Ricardo Ruiz ◽  
Isabell Thomann ◽  
Han-Bo-Ram Lee ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Visible Light ◽  
Light Absorption ◽  
Self Assembly ◽  
Atomic Layer ◽  
Visible Light Absorption ◽  
Layer Deposition

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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