Investigation of optical, structural and morphological properties of nanostructured boron doped TiO 2 thin films

Sönmezoğlu, Savaş; Askeroğlu, İskender

doi:10.1007/s12034-013-0583-8

Cited by 15 publications

(7 citation statements)

References 29 publications

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“…where R is the reflectance, T is the transmittance, A is the absorptance and n is the refractive index. The range of the refractive index is in agreement with those observed for the studied metal oxides by various researchers, such as in [37][38][39]. It can be seen that anomalous behaviour was observed in some of the refractive index spectra of 15%Sn and 20%Sn which could be attributed to change in phase of the material [22,35].…”

Section: Refractive Index and Extinction Coefficientsupporting

confidence: 87%

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite

Bolarinwa

Onuu

Animashaun

et al. 2020

Journal of Taibah University for Science

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The quest for improved visible light absorption in ZnO-based photocatalysts and photodetectors is a prevailing research problem. One method of solving this problem is by narrowing the band gap of this material well into the range of visible light energy. In this work, we have demonstrated considerable band narrowing into the visible region in our electrospun ternary ZnO-Zn 2 SnO 4 nanofibres. We also showed that band narrowing is highly dependent on the amount of Sn in the synthesized composite which could be attributed to the creation of localized states in the ZnO band and the attendant structural changes. However, beyond 15%wt doping there were observed changes in the trend of the bandgap reduction, crystallite sizes, and width of the localized states in the ternary ZnO-Zn 2 SnO 4 band. The details of experimental procedures and discussion of results have been included in this paper.

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Section: Refractive Index and Extinction Coefficientsupporting

confidence: 87%

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite

Bolarinwa

Onuu

Animashaun

et al. 2020

Journal of Taibah University for Science

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“…The shifting of the anatase peak and the phase change might be due to the doping concentration of the boron to TiO 2 , leads to the transformation of the amorphous structure into anatase [22,36]. The obtained results are close to literature data obtained for nanostructured boron doped TiO 2 thin films deposited onto the glass substrate by using sol-gel dip coating method under different deposition conditions [24,[36][37]. The variation of optical bandgaps with boron concentrations in TiO 2 thin films are illustrated in Fig.…”

Section: Optical Band Gap Energysupporting

confidence: 83%

“…Amongst this technique the sol-gel process, as a very promising method, has gained particular attention due to its simplicity, inexpensiveness, non-vacuum, ability to produce thin and homogeneous films on large substrate area and low temperature technique for synthesising films using organic and inorganic precursors. This process offers many benefits like perfect control of the stoichiometry of precursor solutions, ease of compositional modifications, customizable microstructure, ease of introducing various functional groups, requiring relatively low annealing temperatures and the possibility of coating over large area substrates [21,24]. The main objective of this study, therefore, is to establish the suitable synthesis conditions of undoped TiO 2 and B-TiO 2 thin films on the glass substrate by sol-gel technique to obtain high quality transparent thin films for optoelectronic and optical applications in the wavelength range of 250 nm to 850 nm.…”

Section: Introductionmentioning

confidence: 99%

Boron-doped TiO2 (B-TiO2) Thin Films Grown Using Sol-Gel Spin Coating Method

Samson

Buba

2018

AJR2P

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In this study, the effect of modifying boron doping concentration on the optical properties, electrical properties and microstructural images of TiO2 thin films was investigated by the sol-gel technique by grinding TiO2 powder with a boron compound at a wavelength range of 250 nm to 850 nm. The SEM micro-images revealed the homogenous, continuous and nanocrystalline surface morphology: 10% is the tolerable amount of boron doping concentration into the TiO2 for achieving sphere-like nanostructures materials with low agglomeration. The XRD spectra of the B-TiO2 films showed anatase peaks of greater intensities when compared to the pure TiO2 film. All the films illustrate extinction coefficient in the visible region of solar spectra corresponding to the low absorption, and absorption peaks established in the ultraviolet region near 330nm with the optical transmittance varied from over 52 - 96% in the UV-Vis wavelength range. Diffuse reflectance absorption spectra analysis indicated that the incorporation of B into TiO2 material results in a substantial red shift and the absorption extends significantly into the visible range. The optical band gap energy values of the thin films were found to be 3.38, 3.35, 3.28, 3.26, and 3.36eV. This showed a low probability of raising the electron across the mobility gap with the photon energy in the visible region. The refractive index values varied between 1.891 and 1.922 depending on the percentage content of boron. Moreover, the imaginary part of the dielectric constant increase slowly, whereas the real part increases sharply and the optical conductivity was found to increase with the increase in boron addition.

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“…Furthermore, the values of extinction coefficient (k) for all films are close to zero, which agree with the fact that TiO 2 thin film is transparent in the visible region. From figure 8, we can see the refractive index of the pure films found to be lower than other films this may related to the film crystallinity, lattice point defect and film porosity similar result it found by Sava et al [25] when they study boron doped TiO 2 thin films. However, decrease the extinction coefficient (k) and the refractive (n) rabidly with wavelength for different Ru doping concentration could be correlated to an increase of the carrier content after doping and creation of the scattering centers by Ru atoms.…”

Section: Optical Studysupporting

confidence: 81%

Investigation the effect of doping concentration in Ruthenium-doped TiO₂ thin films for solar cells and sensors applications

Al-Shomar

2020

Mater. Res. Express

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Thin films of Ru doped TiO 2 have been deposited on glass substrates at different doping concentration (0.05, 0.07, 0.09, 0.11 mol l −1 ) by the sol gel method. The prepared thin films were studied: their structural, morphological, optical and photocatlytic properties. The XRD spectra confirm that all the samples have anatase phase with preferential orientation along (101) plane. The position of (101) peaks shift to higher angles with increase doping concentration and 0.07 mol l −1 sample have a sharp and high intensity diffraction peak. Due to condensation and agglomeration effect. The thickness of the thin films increases from 110 nm to 255 nm with the increment of Ru concentrations. AFM images show that the films had good quality and pyramidal shape was distributed over their entire surface. Transmittance and absorbance spectra of the un-doped and Ru doped TiO 2 thin films were recorded by UV-vis spectrometer. The optical band gap of the thin films increases from 3.66 eV to 3.85 eV as the Ru amount increases; this is due to the Moss-Burstein effect. Calculated results show that both the excitation coefficient (k) and refractive index (n) decreases with wavelength at all Ru concentration. Optical conductivity can improve after doping which can be a suitable material for use in sensor and solar cell applications. The photocatalytic activity was investigated by monitoring the degradation of methylene blue (MB) under visible and sun light. The results revealed that the photocatalytic activity under sun light was higher comparing to UV light for all films. Ru doped TiO 2 thin films enhance the efficiency of its photocatalytic activity. It was found that the percentage of degradation was higher in 0.11 mol l −1 Ru doped TiO 2 when compared with other films.

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Investigation of optical, structural and morphological properties of nanostructured boron doped TiO 2 thin films

Cited by 15 publications

References 29 publications

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite

Boron-doped TiO2 (B-TiO2) Thin Films Grown Using Sol-Gel Spin Coating Method

Investigation the effect of doping concentration in Ruthenium-doped TiO₂ thin films for solar cells and sensors applications

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Investigation of optical, structural and morphological properties of nanostructured boron doped TiO 2 thin films

Cited by 15 publications

References 29 publications

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn2SnO4 electrospun nanofibre composite

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn2SnO4 electrospun nanofibre composite

Boron-doped TiO2 (B-TiO2) Thin Films Grown Using Sol-Gel Spin Coating Method

Investigation the effect of doping concentration in Ruthenium-doped TiO2 thin films for solar cells and sensors applications

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Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite

Investigation the effect of doping concentration in Ruthenium-doped TiO₂ thin films for solar cells and sensors applications