Role of Cr doping in tuning the optical and dielectric properties of TiO2 nanostructures

Abushad, M.; Arshad, Mohd Khairuddin; Naseem, Swaleha; Husain, Shahid; Khan, Wasi

doi:10.1016/j.matchemphys.2020.123641

Cited by 31 publications

(9 citation statements)

References 52 publications

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“…Usually, the lattice parameter is increased with increased doping concentration [22, 23]. In our case, variation in the lattice parameters can be attributed to the various kinds of doping instead of the increased or decreased doping concentration of a specific dopant.…”

Section: Resultsmentioning

confidence: 76%

Solvothermal synthesis and characterisation of doped TiO ₂ nanocrystals for light scattering applications

Dubey¹,

Pathan

Kale

et al. 2020

Micro & Nano Letters

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Mesoporous nanoparticles have a larger surface area and therefore, suitable for dye-sensitised solar cells and photocatalytic applications. This Letter presents the analysis of solvothermal derived as-prepared TiO 2 and doped TiO 2 nanocrystals by utilising acetone as the solvent. The as-prepared and doped TiO 2 nanoparticles endorsed the presence of anatase phase along with the slightly deviated diffraction peaks with the reduced crystallite size as a result of doping. Surface morphology analyses evidenced the mesoporous microspheres of nanoparticles, whereas the stoichiometry study exhibited the elementary peaks in the as-prepared and doped samples. The estimated optical bandgaps are found to be 2.68, 2.92, 2.48 and 2.88 eV in accordance with the doped TiO 2 with copper, tin, barium and zinc-magnesium as compared to 3.16 eV of TiO 2. Doped samples evidenced the enhanced scattering capability, whereas tin and zinc-magnesium co-doped samples demonstrated the highest diffuse reflectance in a broad wavelength range from 550 to 800 nm.

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Section: Resultsmentioning

confidence: 76%

Solvothermal synthesis and characterisation of doped TiO ₂ nanocrystals for light scattering applications

Dubey¹,

Pathan

Kale

et al. 2020

Micro & Nano Letters

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“…Consequently, the creation of oxygen vacancies in crystal lattice and thereby distortion in crystal structure are obtained [29] . This is considered as a source to produce the interchange of electrons in between the ions therefore it enhances the orientation polarization [10]. Moreover, the surface area per mass was found to increase with doping as shown in Table 1 subsequently, the number of OH groups attached to the particle surface increase so the dielectric constant increase with doping [4].…”

Section: Dielectric Spectroscopic Properties 321 Effect Of Frequency On Dielectric Parametersmentioning

confidence: 94%

“…This enhancement in AC behavior can be attributed to the enhancement in hopping of charge carriers or diverse ionic states of Cr and Ti ions. Therefore, it causes a variation in charges that is responsible for the creation of oxygen vacancies and crystal defects in the TiO 2 lattice to preserve the charge neutrality [10,32] . This may be resulted from the existence of a small polaron hopping mechanism [33].…”

Section: Dielectric Spectroscopic Properties 321 Effect Of Frequency On Dielectric Parametersmentioning

confidence: 99%

“…Semiconductor NPs such as TiO 2 , ZnO and Fe 2 O 3 were used as filler into insulating polymer as well as transformer oil to improve their dielectric performance [6][7][8][9]. TiO 2 is one of the most significant semiconductors widely studied recently due to its many features such availability, chemical stability, nontoxicity, opticalelectronic properties, low cost, and high photocatalytic properties [2,10]. So, TiO 2 has been widely used in a various applications such as gas, temperature sensors, photocatalytic, photoelectric devices, and microelectronics [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Anatase forms at low temperatures, whereas rutile forms at higher temperatures and is thermodynamically stable [11]. According to literature survey, the dielectric polarization and electrical conductivity of TiO 2 were modified by metal doping [2,3,10]. The dielectric constant of Fe doped TiO 2 which synthesized by solgel route, were reported in frequency range of 20 Hz to 10 MHz in which the dielectric constant of pure TiO 2 was enhanced with Fe doping until 4% mole and then decreased for further Fe doping [4].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric response of Cr ̵ doped TiO_2 nanoparticles: Effect of doping concentration and annealing temperature

Eldafatry

Elsad

Mansour

et al. 2021

ERJ. Engineering Research Journal

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The combined effect of doping chromium (Cr) as well as annealing temperature on the dielectric spectroscopy performance of titanium (TiO 2 ) was investigated. Accordingly, two series of chromium doped titania samples with the form (Ti 1-x Cr x O 2 ) where X=0-25 mol% were fabricated utilizing the hydrolysis method. The first series was used as-synthesized while the second series was used after annealing at 500 ℃ for 1h. The microstructure of both synthesized series was characterized by X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). The (XRD) result confirms the formation of the amorphous characteristics of such pure and r doped TiO 2 (as-synthesized) and crystalline characteristics of such pure and Cr -doped TiO 2 (annealed at 500 ℃ for 1h). The average crystallite size in second series (annealed at 500 ℃) as estimated by the Scherrer's equation varies in the range of ~12-30 nm on doping of Cr ions in TiO 2 . The measured surface area of TiO 2 is decreased by Cr doping in first series (as-synthesized) while it is increased by Cr doping in second series (annealed at 500 ℃). The variation in both dielectric constant (ε'), and ac conductivity (σ ac ) as a function of applied frequency at different doping concentration of Cr were investigated. The measurements confirms that both ε' and σ ac values of TiO 2 were decreased with Cr doping in first series and increased with Cr doping in second series.

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Metal and Nonmetal Ion Doping Effect on the Dielectric Relaxation of TiO₂ Electrodes

Vishwakarma

Bag

Jain

2023

Physica Status Solidi (a)

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Titanium dioxide (TiO2) is a highly stable, photosensitive, and nontoxic metal oxide. The physical and chemical properties of TiO2 electrodes have been explored extensively for the last few decades. However, a detailed and comparative study of the dielectric relaxation and carrier kinetics with the dopants is still lacking. Herein, the crystallinity of TiO2 electrodes decreased with the dopants is reported. The doping of copper (Cu) in TiO2 reduces its bandgap to 2.98 eV from 3.22 eV. The improved charge carrier conduction at high frequencies (ω = 103–106 radians s−1) with the doping is noticed. The charge transfer resistance (R ct) for the electrons is minimum for Cu–TiO2 (R ct = 34.11 Ω) and Cu, Zn, and N–TiO2 (R ct = 27.44 Ω) compared to pristine and Cu and Zn–TiO2. Further, the high electrical permittivity is associated with the polar nature of electrodes. The correlation analysis of impedance and modulus spectroscopy data provides a prodigious picture of the charge carrier relaxation and conduction mechanism. A shift in the dielectric relaxation process from Debye type to non‐Debye type is observed after doping due to defect‐mediated fast relaxation of polarization.

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Role of Cr doping in tuning the optical and dielectric properties of TiO2 nanostructures

Cited by 31 publications

References 52 publications

Solvothermal synthesis and characterisation of doped TiO ₂ nanocrystals for light scattering applications

Solvothermal synthesis and characterisation of doped TiO ₂ nanocrystals for light scattering applications

Dielectric response of Cr ̵ doped TiO_2 nanoparticles: Effect of doping concentration and annealing temperature

Metal and Nonmetal Ion Doping Effect on the Dielectric Relaxation of TiO₂ Electrodes

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Role of Cr doping in tuning the optical and dielectric properties of TiO2 nanostructures

Cited by 31 publications

References 52 publications

Solvothermal synthesis and characterisation of doped TiO 2 nanocrystals for light scattering applications

Solvothermal synthesis and characterisation of doped TiO 2 nanocrystals for light scattering applications

Dielectric response of Cr ̵ doped TiO_2 nanoparticles: Effect of doping concentration and annealing temperature

Metal and Nonmetal Ion Doping Effect on the Dielectric Relaxation of TiO2 Electrodes

Contact Info

Product

Resources

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Solvothermal synthesis and characterisation of doped TiO ₂ nanocrystals for light scattering applications

Solvothermal synthesis and characterisation of doped TiO ₂ nanocrystals for light scattering applications

Metal and Nonmetal Ion Doping Effect on the Dielectric Relaxation of TiO₂ Electrodes