Influence of Fe3+ ions doping on TiO2 thin films: Defect generation, d-d transition and band gap tuning for optoelectronic device applications

Paul, Tapash Chandra; Babu, Md. Majibul Haque; Podder, Jiban; Dev, Bidhan Chandra; Sen, Sapan Kumar; Islam, S. S.

doi:10.1016/j.physb.2020.412618

Cited by 30 publications

(10 citation statements)

References 61 publications

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“…6c). This phenomenon confirms that Fe 3+ ions have created an impurity band near the VB due to the oxygen vacancies, resulting in the effective reduction of the optical band gap (Paul et al 2021) as is depicted in Fig. 6b.…”

Section: Materials Characterizationsupporting

confidence: 72%

“…In particular, it is observed that the effect becomes more pronounced as the Fe content is higher in the catalyst. Red shift is a frequent phenomenon observed in the transition metal doped II-IV semiconductor, and it could be ascribed to the production of oxygen vacancies generated, in this case, because of Fe 3+ insertion in TiO 2 lattice framework (Paul et al 2021). For the investigated Fe-TiO 2 materials and following the procedure described below, we propose an electronic band diagram where the band due to these oxygen vacancies is located in a position according with the results presented above.…”

Section: Materials Characterizationmentioning

confidence: 96%

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Facile fabrication of Fe-TiO2 thin film and its photocatalytic activity

Aguinaco

Amaya

Ramírez‐del‐Solar

2021

Environ Sci Pollut Res

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Fe3+-TiO2 (Fe-TiO2) thin films were successfully prepared using a “sandwich” approach. TiO2 NPs were doped with different Fe3+ content (0.05%, 0.1%, 0.2% molar ratio), and the modified TiO2 NPs were deposited on glass flat support by dip coating.Structural, morphological, optical, and photocatalytic properties of Fe-TiO2 thin films were studied. XPS spectra confirm the presence of Ti, Fe, O, and defective –OH groups at the material surface. The Fe 2p spectrum demonstrates the existence of Fe3+. SEM images indicate that the incorporation of Fe3+ deforms in some degree the homogeneity of the TiO2 system. Additionally, incorporation of Fe3+ ions to the network creates an impurity band near the VB due to the oxygen vacancies, resulting in the reduction of the effective optical band gap. Photocatalytic activity of fabricated thin films in the elimination of sulfamethoxazole (SMT) follows pseudo first-order kinetics. The highest SMT removal yields were achieved using the sample with 0.05%Fe. Additionally, the use of greater thicknesses improves the removal performance. However, material detachment limits the maximum usable value around 6 µm.Finally, stability and reusability of catalysts were confirmed studying the photocatalytic activity over three cycles and evaluating that no Fe3+ leaching occurred. Graphical abstract

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Section: Materials Characterizationsupporting

confidence: 72%

Section: Materials Characterizationmentioning

confidence: 96%

Facile fabrication of Fe-TiO2 thin film and its photocatalytic activity

Aguinaco

Amaya

Ramírez‐del‐Solar

2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

show abstract

“…During the calcination of amorphous meta‐titanic acid, the presence of impurity can influence the polymorphic transformation temperature, phase concentration, 33,34 grain growth, 35 and agglomerate size 36–40 . Within a certain range of concentration, some impurities can introduce a different type of defect resulting in accelerating or decelerating influence on anatase to rutile conversion rate 33,34 . Impurities of comparable size can form a solid solution, either increasing or decreasing defect concentration.…”

Section: Resultsmentioning

confidence: 99%

“…[36][37][38][39][40] Within a certain range of concentration, some impurities can introduce a different type of defect resulting in accelerating or decelerating influence on anatase to rutile conversion rate. 33,34 Impurities of comparable size can form a solid solution, either increasing or decreasing defect concentration. Impurity [36][37][38]41 S, P, and Si can inhibit the anatase to rutile transformation and grain growth, 34,40,[42][43][44][45] among which P and Si have significant influence even at lower concentration.…”

Section: Surface Morphology and Chemistry Of Calcined Powders Of Hydr...mentioning

confidence: 99%

Tuning anatase to rutile ratio in nanocrystalline titania enriched from sustainable beach sand from Cox's Bazar, Bangladesh

Roy

Bashar

Tofail

et al. 2023

Surface & Interface Analysis

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A sustainable source of titania (TiO 2 ) is important in applications of photovoltaic devices, photocatalysts, sensors, and so forth. Beach sand from Cox's Bazar, Bangladesh, can be an excellent sustainable source of this titania as almost a quarter of it contains titania in the form of rutile and ilmenite. This study demonstrates the success of a sulfuric acid-based hydrometallurgical process in enriching titania in Cox's Bazar beach sand. The route produces precursors that can be conveniently calcined into nanocrystalline phase-pure anatase or anatase/rutile composites. We used both bulk and surface characterization to determine phase purity, crystallite size as well as surface chemistry, and morphology of the resulting anatase and rutile/anatase mixture. The proportion of anatase/rutile can be tuned by varying digestion times. This hydrometallurgical route can potentially lead to the scalable production of precursors used in producing high-performance nanocrystalline titania from a sustainable source of beach sand from Cox's Bazar of Bangladesh.

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“…Titanium oxide is regarded as the first semiconductor for photocatalyst-based water splitting [ 16 ], but because of a large band gap (3.2 eV) [ 110 ], it can only utilize UV radiation [ 111 ], which accounts for only a small portion of the solar spectrum. Still, many studies improved upon TiO 2 photocatalysts.…”

Section: Modern Developments In Photocatalysts For High-kinetic Water...mentioning

confidence: 99%

Semiconductor Nanomaterial Photocatalysts for Water-Splitting Hydrogen Production: The Holy Grail of Converting Solar Energy to Fuel

et al. 2023

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Nanomaterials have attracted attention for application in photocatalytic hydrogen production because of their beneficial properties such as high specific surface area, attractive morphology, and high light absorption. Furthermore, hydrogen is a clean and green source of energy that may help to resolve the existing energy crisis and increasing environmental pollution caused by the consumption of fossil fuels. Among various hydrogen production methods, photocatalytic water splitting is most significant because it utilizes solar light, a freely available energy source throughout the world, activated via semiconductor nanomaterial catalysts. Various types of photocatalysts are developed for this purpose, including carbon-based and transition-metal-based photocatalysts, and each has its advantages and disadvantages. The present review highlights the basic principle of water splitting and various techniques such as the thermochemical process, electrocatalytic process, and direct solar water splitting to enhance hydrogen production. Moreover, modification strategies such as band gap engineering, semiconductor alloys, and multiphoton photocatalysts have been reviewed. Furthermore, the Z- and S-schemes of heterojunction photocatalysts for water splitting were also reviewed. Ultimately, the strategies for developing efficient, practical, highly efficient, and novel visible-light-harvesting photocatalysts will be discussed, in addition to the challenges that are involved. This review can provide researchers with a reference for the current state of affairs, and may motivate them to develop new materials for hydrogen generation.

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Influence of Fe3+ ions doping on TiO2 thin films: Defect generation, d-d transition and band gap tuning for optoelectronic device applications

Cited by 30 publications

References 61 publications

Facile fabrication of Fe-TiO2 thin film and its photocatalytic activity

Facile fabrication of Fe-TiO2 thin film and its photocatalytic activity

Tuning anatase to rutile ratio in nanocrystalline titania enriched from sustainable beach sand from Cox's Bazar, Bangladesh

Semiconductor Nanomaterial Photocatalysts for Water-Splitting Hydrogen Production: The Holy Grail of Converting Solar Energy to Fuel

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