Dataset Information

Bi_0.9Ho_0.1FeO₃/TiO₂ Composite Thin Films: Synthesis and Study of Optical, Electrical and Magnetic Properties.

ABSTRACT: A visible light active Bi_0.9Ho_0.1FeO₃ nanoparticles/TiO₂ composite thin films with different mol.% of Bi_0.9Ho_0.1FeO₃ were successfully prepared via non-aqueous sol-gel method. The incorporation of 5, 10 and 20?mol.% Bi_0.9Ho_0.1FeO₃ nanoparticles in the precursor solution of TiO₂ brings modifications in the functional properties of the composite thin films. XPS analysis indicates that interdiffusion of Fe³⁺, Ho³⁺, Bi³⁺/Ti⁴⁺ ions through the interfaces between Bi_0.9Ho_0.1FeO₃ nanoparticles and TiO₂ matrix reduces the concentration of Ti³⁺ ions. X-ray diffraction analysis affirms that TiO₂ and Bi_0.9Ho_0.1FeO₃ retain anatase and orthorhombic phase respectively in composite films. The composite thin film containing 20?mol.% Bi_0.9Ho_0.1FeO₃ nanoparticles exhibits the most prominent absorption phenomenon in visible region and has significantly reduced indirect band gap of 2.46?eV compared to that of pure TiO₂ (3.4?eV). Hall effect measurements confirm that the resistivity of composite film increases by ?2.33 orders of magnitude and its carrier concentration decreases by 1.8 orders of magnitude at 5?mol.% Bi_0.9Ho_0.1FeO₃ nanoparticles addition compared to those of pure TiO₂ film. Moreover, the pure film exhibits diamagnetism, whereas the composite films have both large ferromagnetic and small diamagnetic components. The findings in this research justify that the composite film can be a potential candidate for making improved photocatalyst, resistors and spintronic devices.

SUBMITTER: Islam MR

PROVIDER: S-EPMC6435789 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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Publications

Bi0.9Ho0.1FeO3/TiO2 Composite Thin Films: Synthesis and Study of Optical, Electrical and Magnetic Properties.

Islam Md Rafiqul MR Zubair M A MA Zubair M A MA Bashar M S MS Rashid A K M B AKMB

Scientific reports 20190326 1

A visible light active Bi0.9Ho0.1FeO3 nanoparticles/TiO2 composite thin films with different mol.% of Bi0.9Ho0.1FeO3 were successfully prepared via non-aqueous sol-gel method. The incorporation of 5, 10 and 20 mol.% Bi0.9Ho0.1FeO3 nanoparticles in the precursor solution of TiO2 brings modifications in the functional properties of the composite thin films. XPS analysis indicate ...[more]

PMID: 30914720

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Project description:Titanium dioxide (TiO2) in the form of thin films has attracted enormous attention for photocatalysis. It combines the fundamental properties of TiO2 as a large bandgap semiconductor with the advantage of thin films, making it competitive with TiO2 powders for recycling and maintenance in photocatalytic applications. There are many aspects affecting the photocatalytic performance of thin film structures, such as the nanocrystalline size, surface morphology, and phase composition. However, the quantification of each influencing aspect needs to be better studied and correlated. Here, we prepared a series of TiO2 thin films using a sol-gel process and spin-coated on p-type, (100)-oriented silicon substrates with a native oxide layer. The as-deposited TiO2 thin films were then annealed at different temperatures from 400 °C to 800 °C for 3 h in an ambient atmosphere. This sample synthesis provided systemic parameter variation regarding the aspects mentioned above. To characterize thin films, several techniques were used. Spectroscopic ellipsometry (SE) was employed for the investigation of the film thickness and the optical properties. The results revealed that an increasing annealing temperature reduced the film thickness with an increase in the refractive index. Atomic force microscopy (AFM) was utilized to examine the surface morphology, revealing an increased surface roughness and grain sizes. X-ray diffractometry (XRD) and UV-Raman spectroscopy were used to study the phase composition and crystallite size. The annealing process initially led to the formation of pure anatase, followed by a transformation from anatase to rutile as the annealing temperature increased. An overall enhancement in crystallinity was also observed. The photocatalytic properties of the thin films were tested using the photocatalytic decomposition of acetone gas in a home-built solid (photocatalyst)-gas (reactant) reactor. The composition of the gas mixture in the reaction chamber was monitored using in situ Fourier transform infrared spectroscopy. Finally, all of the structural and spectroscopic characteristics of the TiO2 thin films were quantified and correlated with their photocatalytic properties using a correlation matrix. This provided a good overview of which film properties affect the photocatalytic efficiency the most.

Dataset Information

Bi_0.9Ho_0.1FeO₃/TiO₂ Composite Thin Films: Synthesis and Study of Optical, Electrical and Magnetic Properties.

Publications

Bi<sub>0.9</sub>Ho<sub>0.1</sub>FeO<sub>3</sub>/TiO<sub>2</sub> Composite Thin Films: Synthesis and Study of Optical, Electrical and Magnetic Properties.

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