Fabrication and photoelectrochemical activity of hierarchically Porous TiO2–ZnO heterojunction film

Khan, Hasmat; Samanta, Srikrishna; Seth, Malobi; Jana, Sunirmal

doi:10.1007/s10853-020-04858-2

Cited by 15 publications

(5 citation statements)

References 21 publications

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“…In this regard, we calculated the LHE values of the samples with the help of eq . In fact, a technique to improve light absorption of nanomaterials by photon trapping is termed as light harvesting or total absorption of the nanomaterials . The nanostructured materials having the comparable dimensions with the wavelength of incident light emit scattered light and increase the effective optical path-length inside the materials, leading to improved light absorption or LHE.…”

Section: Resultsmentioning

confidence: 99%

“…In fact, a technique to improve light absorption of nanomaterials by photon trapping is termed as light harvesting or total absorption of the nanomaterials. 53 The nanostructured materials having the comparable dimensions with the wavelength of incident light emit scattered light and increase the effective optical path-length inside the materials, leading to improved light absorption or LHE. Moreover, the defects in metal oxide semiconductors could improve light absorption by trapping photons in their defect states, resulting in improved PEC performances.…”

Section: Effect Of Defects On the Pec Parameters Of Ald-tiomentioning

confidence: 99%

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Atomic Layer Deposition of Defective Amorphous TiO_x Thin Films with Improved Photoelectrochemical Performance

Kim,

Bae,

Jung

et al. 2023

ACS Appl. Mater. Interfaces

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A proper control of defects in TiO2 thin films is challenging work for enhancing the photoelectrochemical (PEC) efficiency in water splitting processes. Additionally, a deep understanding of how defects affect the PEC performance of TiO2 thin films is of great interest for achieving better performance. With these aims, we prepared defective amorphous TiO x thin films at various growth temperatures by atomic layer deposition using tetrakis(dimethylamido)titanium as the Ti precursor. Careful X-ray photoelectron spectroscopy and electron spin resonance spectroscopy analyses revealed that the defect concentration in the TiO x thin films can be controlled by adjusting the growth temperature during the ALD process. We also evaluated the light absorption properties of the deposited TiO x thin films using ultraviolet–visible absorption spectroscopy. And it was found that the TiO x thin film deposited at a growth temperature of 200 °C exhibited the highest defect concentration and the highest photocurrent density of 0.051 mA/cm2 at 1.23 V vs reversible hydrogen electrode (RHE) compared to those of the other films. The light absorption efficiency, photogenerated charge separation efficiency, and charge transfer efficiency of defective amorphous TiO x thin films were carefully studied to understand the correlation between the defect concentration in the prepared TiO x thin film and its PEC activity. This study provides insight into the PEC properties of defective amorphous ALD-TiO x thin films.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Defects On the Pec Parameters Of Ald-tiomentioning

confidence: 99%

Atomic Layer Deposition of Defective Amorphous TiO_x Thin Films with Improved Photoelectrochemical Performance

Kim,

Bae,

Jung

et al. 2023

ACS Appl. Mater. Interfaces

Self Cite

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“…Photocatalysis utilizing semiconductors is a well‐known technology for contaminants decomposition in both aqueous and non‐aqueous systems [35–37] . For pollutant removal, many photocatalysts, such as TiO 2 , ZnO, CuS, and CdS, have been used [38–41] …”

Section: Introductionmentioning

confidence: 99%

“…[35][36][37] For pollutant removal, many photocatalysts, such as TiO 2 , ZnO, CuS, and CdS, have been used. [38][39][40][41] Among these photocatalysts, TiO 2 nanoparticles are the most widely studied [42][43][44][45] and used for their attractive properties, such as good photocatalytic properties, little toxicology, availability, inexpensiveness, stability against chemical and photo-corrosion, high turnover, complete mineralization of organic pollutants, and significant oxidizing ability. [46][47][48][49][50][51][52][53][54][55][56][57] Despite extensive academic research over the past forty years on the prospect of mineralizing a wide variety of contaminants using TiO 2 photocatalysis, the commercial application of the TiO 2 photocatalysis system remains limited.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Epoxy Paint Based on TiO₂ for the Decontamination of Water under Visible LED and Sunlight Irradiation

Chawraba,

Medlej,

Noun

et al. 2024

ChemistrySelect

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Semiconductor oxides such as titanium dioxide (TiO2) have been used as photocatalysts for removing contaminants. In addition, TiO2 nanoparticles in suspension form are difficult to recover and recycle, and they are expensive. In our work, titanium dioxide has been immobilized on a commercially available, thermally stable, chemically stable, and cheap polymer. The nanocomposite is synthesized with varying percentages of TiO2, 0.25, 0.5, and 1 weight percent. The obtained nanocomposites were characterized, and the effect of the process parameter (i. e., initial concentration of MB, amount of catalyst, light wavelength, and power of light) was investigated. Also, the results show good photodegradation of MB by the TiO2‐epoxy nanocomposite. The decomposition of 10 ppm methylene blue (MB) during 200 min under 25 W visible LED irradiation can reach 95 %. This value is higher than that obtained with pristine TiO2, which does not have photocatalytic activity under LED light. The antibacterial activity of nanocomposites concerning Escherichia coli and Stephalocous aureus was studied, and an inhibition zone of 2 cm and 3.5 cm was obtained, respectively. Therefore, the TiO2‐epoxy nanocomposite was applied to a glass jar and tested after four months for the degradation of methylene blue (5 ppm) and methyl orange (8 ppm) under sunlight. The paint demonstrated good photocatalytic efficiency of 41 % and 72 % within 310 min, respectively.

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“…Furthermore, Kamitani et al used 98.6 µm microspheres to make high porosity alumina films for possible uses as filters, insulators, and catalytic support [4]. Another interesting work is that of Khan et al who, with spheres of approximately 300 nm diameter, fabricated a porous film of TiO 2 in heterojunction with ZnO for potential use as an efficient photoanode in a photoelectrochemical cell [5]. It is also important to mention the research of Sordello and Minero, who synthesized microspheres with 250 nm diameter porous TiO 2 powders with Pt to improve the H 2 production of this semiconductor [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of PMMA Microspheres with Tunable Diameters: Evaluation as a Template in the Synthesis of Tin Oxide Coatings

Mendoza-Castellanos,

Pantoja-Espinoza,

Rodríguez-Pacheco

et al. 2023

Polymers

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The synthesis of polymethyl methacrylate (PMMA) spheres with different sizes has been a challenge. PMMA has promise for future applications, e.g., as a template for preparing porous oxide coatings by thermal decomposition. Different amounts of SDS as a surfactant are used as an alternative to control PMMA microsphere size through the formation of micelles. The objectives of the study were twofold: firstly, to determine the mathematical relationship between SDS concentration and PMMA sphere diameter, and secondly, to assess the efficacy of PMMA spheres as templates for SnO2 coating synthesis and their impact on porosity. The study used FTIR, TGA, and SEM techniques to analyze the PMMA samples, and SEM and TEM techniques were used for SnO2 coatings. The results showed that PMMA sphere diameter could be adjusted by varying the SDS concentration, with sizes ranging from 120 to 360 nm. The mathematical relationship between PMMA sphere diameter and SDS concentration was determined with a y = axb type equation. The porosity of SnO2 coatings was found to be dependent on the PMMA sphere diameter used as a template. The research concludes that PMMA can be used as a template to produce oxide coatings, such as SnO2, with tunable porosities.

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Fabrication and photoelectrochemical activity of hierarchically Porous TiO2–ZnO heterojunction film

Cited by 15 publications

References 21 publications

Atomic Layer Deposition of Defective Amorphous TiO_x Thin Films with Improved Photoelectrochemical Performance

Atomic Layer Deposition of Defective Amorphous TiO_x Thin Films with Improved Photoelectrochemical Performance

Photocatalytic Epoxy Paint Based on TiO₂ for the Decontamination of Water under Visible LED and Sunlight Irradiation

Synthesis of PMMA Microspheres with Tunable Diameters: Evaluation as a Template in the Synthesis of Tin Oxide Coatings

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Fabrication and photoelectrochemical activity of hierarchically Porous TiO2–ZnO heterojunction film

Cited by 15 publications

References 21 publications

Atomic Layer Deposition of Defective Amorphous TiOx Thin Films with Improved Photoelectrochemical Performance

Atomic Layer Deposition of Defective Amorphous TiOx Thin Films with Improved Photoelectrochemical Performance

Photocatalytic Epoxy Paint Based on TiO2 for the Decontamination of Water under Visible LED and Sunlight Irradiation

Synthesis of PMMA Microspheres with Tunable Diameters: Evaluation as a Template in the Synthesis of Tin Oxide Coatings

Contact Info

Product

Resources

About

Atomic Layer Deposition of Defective Amorphous TiO_x Thin Films with Improved Photoelectrochemical Performance

Atomic Layer Deposition of Defective Amorphous TiO_x Thin Films with Improved Photoelectrochemical Performance

Photocatalytic Epoxy Paint Based on TiO₂ for the Decontamination of Water under Visible LED and Sunlight Irradiation