Dispensability of the conventional Tauc’s plot for accurate bandgap determination from UV–vis optical diffuse reflectance data

Jubu, Peverga R.; Obaseki, O. S.; Nathan-Abutu, A.; Yam, F.K.; Yusof, Y.; Ochang, M. B.

doi:10.1016/j.rio.2022.100273

Cited by 97 publications

(22 citation statements)

References 24 publications

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“…The optical band gap of both films was estimated by converting the wavelength to photon energy and plotting % R vs photon energy (Figure , right). The estimated band gap is then extrapolated from the reflectance curve. , The value returned for the film deposited from 2 at 600 °C gave an estimated band gap of 1.78 eV, and the film deposited from the starting materials at 600 °C gave a value of 1.75 eV (Figure S22, right). These values lie between the literature band gap values for bulk MoS 2 (∼1.3 eV) and monolayer samples (∼1.9 eV), , consistent with reported values for few layer samples.…”

Section: Resultsmentioning

confidence: 99%

Aerosol-Assisted Chemical Vapor Deposition of MoS₂ with a Thiourea Sulfur Source: Single-Source Precursors vs Coreactant Mixtures

Germaine

Hüttel

Alderman

et al. 2023

ACS Appl. Mater. Interfaces

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Aerosol-assisted chemical vapor deposition of MoS 2 from solutions containing the single-source precursors cis-Mo-(CO) 4 (TMTU) 2 and Mo(CO) 5 (TMTU) in toluene was compared to depositions from the coreactant solution containing Mo(CO) 6 and uncoordinated TMTU in toluene. The results were used to assess the significance of ligand precoordination on the properties of the deposited films. Raman spectra and GI-XRD patterns of the films show that the single-source precursors produced more intense and sharper signals for 2H-MoS 2 as compared to the coreactant system of Mo(CO) 6 and TMTU, which is indicative of improved crystallinity. SEM and XPS were also used to assess morphology and film composition. Thermolysis of cis-Mo(CO) 4 (TMTU) 2 and analysis of the pyrolysis products by GC−MS and 1 H NMR suggested a decomposition mechanism of the TMTU ligand where a terminal sulfido is generated on the molybdenum center with loss of a heteroatom stabilized carbene.

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Section: Resultsmentioning

confidence: 99%

Aerosol-Assisted Chemical Vapor Deposition of MoS₂ with a Thiourea Sulfur Source: Single-Source Precursors vs Coreactant Mixtures

Germaine

Hüttel

Alderman

et al. 2023

ACS Appl. Mater. Interfaces

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“…The Y-axis shows the product of the absorption coefficient with energy (αhv) 2 as the dependent variable. Using the Tauc plot method, the band gap of the photocatalyst can be determined by drawing a straight line between the outcome of the absorption coefficient [29].…”

Section: The Optical Propertiesmentioning

confidence: 99%

A New Combination Method of N-doped TiO2 Nanoparticles Synthesis for Heavy Metal Ions Cr(VI) Photoreduction Applications

et al. 2023

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Through a combination of biosynthetic and hydrothermal methods, N-doped TiO2 photocatalyst has been successfully synthesized using various concentrations of ammonia as a nitrogen source, namely 10% w/w (NTO10), 20% w/w (NTO20), 35% w/w (NTO35), and 50% w/w (NTO50). The synthesis of TiO2 was conducted using Aloe vera (L) Burm F. rind extract as a natural capping agent via the biosynthetic method, followed by a nitrogen doping process via the hydrothermal method. The X-ray Diffraction (XRD) analysis revealed that all phases were anatase. According to the results of the UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS) analysis using the Tauc-Plot method, all N-doped TiO2 samples showed a decrease in the energy gap compared to the TO sample. This indicates that the doping of TiO2 using nitrogen has been successfully doped into TiO2. The photocatalytic activity of N-doped TiO2 was evaluated for the photoreduction of the Cr(VI) model pollutant using a 24-watt LED lamp as a visible light source for 120 minutes. The results indicate that the NTO35 is the best-prepared N-doped TiO2, which showed a reduced rate for the Cr (VI) model pollutant of 50.88%, or two times greater than that of undoped TiO2.

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“…where S is the scattering coefficient, R ∞ (R sample /R standard ) is the diffuse reflectance of the infinitely thick specimen, and K is the absorption coefficient. [92] Furthermore, the optical energy bandgap can be esti- been investigated to explore the electrical and optical properties of the ZnO nanostructure. [93] The upsurge in the optical bandgap of the ZnO structure with the growing concentration of Eu doping was observed.…”

Section: Optical Propertiesmentioning

confidence: 99%

“…The Kubelka–Munk function is written as; F ( R ∞ ) = K / S = ( 1‐R ∞ ) / 2 R ∞ , where S is the scattering coefficient, R ∞ ( R sample / R standard ) is the diffuse reflectance of the infinitely thick specimen, and K is the absorption coefficient. [ 92 ] Furthermore, the optical energy bandgap can be estimated from the [ F ( R ∞ ) hν ] 1/n versus hν plots using the relationship: [ F ( R ∞ ) hν ] = C ( hν − E g ) n . The n values indicate whether the allowed transitions are direct for n = 1/2 or indirect for n = 2.…”

Section: Properties Of Zno Nanostructurementioning

confidence: 99%

Recent advances in ZnO nanostructure as a gas‐sensing element for an acetone sensor: a short review

et al. 2022

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Air pollution is a severe concern globally as it disturbs the health conditions of living beings and the environment because of the discharge of acetone molecules. Metal oxide semiconductor (MOS) nanomaterials are crucial for developing efficient sensors because of their outstanding chemical and physical properties, empowering the inclusive developments in gas sensor productivity. This review presents the ZnO nanostructure state of the art and notable growth, and their structural, morphological, electronic, optical, and acetone-sensing properties. The key parameters, such as response, gas detection limit, sensitivity, reproducibility, response and recovery time, selectivity, and stability of the acetone sensor, have been discussed. Furthermore, gas-sensing mechanism models based on MOS for acetone sensing are reported and discussed. Finally, future possibilities and challenges for MOS (ZnO)-based gas sensors for acetone detection have also been explored.

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Dispensability of the conventional Tauc’s plot for accurate bandgap determination from UV–vis optical diffuse reflectance data

Cited by 97 publications

References 24 publications

Aerosol-Assisted Chemical Vapor Deposition of MoS₂ with a Thiourea Sulfur Source: Single-Source Precursors vs Coreactant Mixtures

Aerosol-Assisted Chemical Vapor Deposition of MoS₂ with a Thiourea Sulfur Source: Single-Source Precursors vs Coreactant Mixtures

A New Combination Method of N-doped TiO2 Nanoparticles Synthesis for Heavy Metal Ions Cr(VI) Photoreduction Applications

Recent advances in ZnO nanostructure as a gas‐sensing element for an acetone sensor: a short review

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Dispensability of the conventional Tauc’s plot for accurate bandgap determination from UV–vis optical diffuse reflectance data

Cited by 97 publications

References 24 publications

Aerosol-Assisted Chemical Vapor Deposition of MoS2 with a Thiourea Sulfur Source: Single-Source Precursors vs Coreactant Mixtures

Aerosol-Assisted Chemical Vapor Deposition of MoS2 with a Thiourea Sulfur Source: Single-Source Precursors vs Coreactant Mixtures

A New Combination Method of N-doped TiO2 Nanoparticles Synthesis for Heavy Metal Ions Cr(VI) Photoreduction Applications

Recent advances in ZnO nanostructure as a gas‐sensing element for an acetone sensor: a short review

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Aerosol-Assisted Chemical Vapor Deposition of MoS₂ with a Thiourea Sulfur Source: Single-Source Precursors vs Coreactant Mixtures

Aerosol-Assisted Chemical Vapor Deposition of MoS₂ with a Thiourea Sulfur Source: Single-Source Precursors vs Coreactant Mixtures