Effect of zinc doping on the bandgap and photoluminescence of Zn 2+ -doped TiO 2 nanowires

Loan, Trinh Thi; Huong, Vu Hoang; Tham, Vu Thi; Long, Nguyen Ngoc

doi:10.1016/j.physb.2017.05.027

Cited by 33 publications

(18 citation statements)

References 33 publications

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“…We attribute the slight decrease in the band gap to the formation of a shallow state below the CB with the addition of Zn 2+ . 32 Band-gap values around 2.1 eV are consistent with previously reported band-gap calculations of Fe2TiO5. The composition and chemical state of the film surfaces were evaluated using XPS analysis.…”

Section: Resultssupporting

confidence: 90%

“…30 These distortions are caused by the differences in ionic radii between Zn 2+ (0.74 Å) and that of Ti 4+ (0.605 Å) as well as Fe 3+ (0.79 Å) and also Fe 2+ (0.92 Å) and Ti 3+ (0.81 Å) that are evidently existing within these films (see XPS results below). 31,32 In addition, the similarity of our calculated a and b lattice parameters for the Fe-Ti-O-Zn film with those reported by Müller-Buschbaum for a titanium-rich pseudobrookite (a=3.756 Å and b=9.812 Å) suggests a titaniumrich composition (small x in Fe1+xTi2-xO5) in the samples. 33 Conversely, our calculated a and b values for the Fe-Ti-O sample suggest an iron rich pseudobrookite (x approaching 1 in Fe1+xTi2-xO5).…”

Section: Resultssupporting

confidence: 85%

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Zn-Doped Fe₂TiO₅ Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Regue

Ahmet

Bassi

et al. 2020

ACS Appl. Energy Mater.

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Water splitting in photoelectrochemical cells is a promising technology to produce solar hydrogen. Fe2TiO5 pseudobrookite with a bandgap of around 2 eV absorbs the predominant visible range of the solar spectrum and is emerging as a promising photoanode for such cells. Herein, we present Fe2TiO5 pseudobrookite-based films prepared by aerosol-assisted chemical vapor deposition and the positive impact of Zn 2+ doping in their formation and performance. Undoped and Zn 2+doped Fe2TiO5 pseudobrookite-based photoanodes were characterized by techniques such as XRD, XPS, UPS and Mott-Schottky analysis. We find that the Zn 2+ ions are preferentially incorporated in the pseudobrookite phase over a present secondary hematite (α-Fe2O3) phase. The Zn 2+ doping modifies the electronic properties of the films, increases their charge carrier concentration and upshifts their Fermi level, significantly improving their anodic photocurrent response by a factor of three. In addition, charge transfer efficiency calculations reveal that Zn 2+ doping improves both charge separation and injection efficiencies, overall demonstrating a promising approach for the design of enhanced pseudobrookite-based photoanodes.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 85%

Zn-Doped Fe₂TiO₅ Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Regue

Ahmet

Bassi

et al. 2020

ACS Appl. Energy Mater.

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“…Fluorescence enhancement may be induced by the higher density of interstitial Zn trap states as well as nonradiative centers at 3% dopant concentration. Therefore, these samples have potential applications in optoelectronic devices [31,32], such as optical detectors, solar cell field-effect transistors, photonics, luminescence sensors, light-emitting devices (LEDs), low-threshold lasers, optical amplifiers, and biological probes.…”

Section: Resultsmentioning

confidence: 99%

Bioinspired ZnS:Gd Nanoparticles Synthesized from an Endophytic Fungi Aspergillus flavus for Fluorescence-Based Metal Detection

et al. 2019

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Recently, several nonconventional sources have emerged as strong hotspots for the biosynthesis of chalcogenide quantum dots. However, studies that have ascertained the biomimetic methodologies that initiate biosynthesis are rather limited. The present investigation portrays a few perspectives of rare-earth(Gd)-doped ZnS biosynthesis using the endophytic fungi Aspergillus flavus for sensing metals based on their fluorescence. Analysis of ZnS:Gd nanoparticles was performed by elemental analysis, energy-dispersive X-ray spectroscopy (EDS), atomic force microscopy (AFM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), photoluminescence (PL), and transmission electron microscopy (TEM). The results of TEM demonstrated that the particles were polycrystalline in nature, with a mean size of 10–18 nm. The fluorescence amenability of the biogenic ZnS nanoparticles was further used for the development of a simple and efficient sensing array. The results showed sensitive and detectable quenching/enhancement in the fluorescence of biogenic colloidal ZnS nanoparticles, in the presence of Pb (II), Cd (II), Hg (II), Cu (II) and Ni (II), respectively. The fluorescence intensity of the biogenic ZnS:Gd nanoparticles was found to increase compared to that of the ZnS nanoparticles that capacitate these systems as a reliable fluorescence sensing platform with selective environmental applications.

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“…The band gap energy (E g ) was calculated by Tauc plots in which indirect transition band gap was postulated ( Table 1). [17][18][19] The Cr-TiO 2 , Pt-TiO 2 , and V-TiO 2 samples possess a similar tendency that the transformation to rutile is suppressed and E g decreases as the doping amount increases. Table 1 also lists the BET specic surface area (SSA) of these samples, which does not change systematically except for Cr-TiO 2 .…”

Section: Comparison Of Cr-tio 2 Pt-tio 2 and V-tiomentioning

confidence: 94%

Visible light responsive TiO₂ photocatalysts for degradation of indoor acetaldehyde

et al. 2020

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Effect of zinc doping on the bandgap and photoluminescence of Zn 2+ -doped TiO 2 nanowires

Cited by 33 publications

References 33 publications

Zn-Doped Fe₂TiO₅ Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Zn-Doped Fe₂TiO₅ Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Bioinspired ZnS:Gd Nanoparticles Synthesized from an Endophytic Fungi Aspergillus flavus for Fluorescence-Based Metal Detection

Visible light responsive TiO₂ photocatalysts for degradation of indoor acetaldehyde

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Effect of zinc doping on the bandgap and photoluminescence of Zn 2+ -doped TiO 2 nanowires

Cited by 33 publications

References 33 publications

Zn-Doped Fe2TiO5 Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Zn-Doped Fe2TiO5 Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Bioinspired ZnS:Gd Nanoparticles Synthesized from an Endophytic Fungi Aspergillus flavus for Fluorescence-Based Metal Detection

Visible light responsive TiO2 photocatalysts for degradation of indoor acetaldehyde

Contact Info

Product

Resources

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Zn-Doped Fe₂TiO₅ Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Zn-Doped Fe₂TiO₅ Pseudobrookite-Based Photoanodes Grown by Aerosol-Assisted Chemical Vapor Deposition

Visible light responsive TiO₂ photocatalysts for degradation of indoor acetaldehyde