Md. Abdul Jalil

The 10% Gd and Ti co-doped BiFeO3: A promising multiferroic material

Publisher: Elsevier BV

Date: 02-2017

DOI: 10.1016/J.JALLCOM.2016.10.018

Impact of reaction temperatures on the particle size of V2O5 synthesized by facile hydrothermal technique and photocatalytic efficacy in dye degradation

Publisher: AIP Publishing

Date: 2023

DOI: 10.1063/5.0125200

Abstract: In this study, the influence of hydrothermal reaction temperatures on V2O5synthesized via a green facile mild hydrothermal method at six different reaction temperatures ranging from 100 to 200 °C, at steps of 20 °C and the physical properties the synthesized s les have been investigated. The x-ray diffraction pattern confirms the stable orthorhombic crystal structure of the synthesized s les at all reaction temperatures. The scanning electron microscopy and transmission electron microscopy images demonstrate the particle-like morphology, and these characterizations affirmed that the particles’ size became larger with the increase in the reaction temperatures. To study the functional groups, Fourier-transform infrared investigation has been employed. The bandgap of the synthesized s les has been estimated using UV-vis diffuse reflectance spectra and was found to vary from 2.08 to 2.15 eV, which implies their suitability for absorbing a significant amount of visible light. The photocatalysis of methylene blue with synthesized s les has been carried out to investigate the photocatalytic efficiency. Pure V2O5 synthesized at a lower reaction temperature (100 °C) possesses a lower bandgap and, accordingly, higher photocatalytic efficiency.

Temperature-dependent phase transition and comparative investigation on enhanced magnetic and optical properties between sillenite and perovskite bismuth ferrite-rGO nanocomposites

Publisher: AIP Publishing

Date: 28-08-2017

DOI: 10.1063/1.4985840

Abstract: The manuscript reports the synthesis as well as a comparative investigation of the structural, magnetic, and optical properties between sillenite and perovskite type bismuth ferrite-reduced graphene oxide nanocomposites. Graphite oxide is prepared using the modified Hummers' method, followed by hydrothermal synthesis of bismuth ferrite-reduced graphene oxide nanocomposites at different reaction temperatures. The X-ray diffraction measurements confirm the formation of perovskite type BiFeO3-rGO nanocomposites at a reaction temperature of 200 °C. This is the lowest temperature to obtain perovskite type BiFeO3-rGO nanocomposites under the reaction procedure adopted, however, a structural transition to sillenite type Bi25FeO40-rGO is observed at 180 °C. The FESEM images demonstrate that the particle size of the perovskite nanocomposite is 25–60 nm, and for the sillenite phase nanocomposite it is 10–30 nm. The as-synthesized nanocomposites exhibit significantly enhanced saturation magnetization over pure BiFeO3 nanoparticles, with the sillenite Bi25FeO40-rGO nanocomposite having higher saturation magnetization than perovskite BiFeO3-rGO. The optical characteristics of the as-synthesized nanocomposites demonstrate considerably higher absorbance in the visible range with significantly lower band gap in comparison to undoped BiFeO3. Again, the sillenite Bi25FeO40-rGO nanocomposite is shown to have a lower band gap compared to the perovskite counterpart. Our investigation provides a means of selective phase formation as desired between sillenite Bi25FeO40-rGO and perovskite BiFeO3-rGO by controlling the hydrothermal reaction temperature. The outcome of our investigation suggests that the formation of nanocomposite of sillenite bismuth ferrite with reduced graphene oxide is promising to improve the magnetic and optical properties for potential technological applications.

Enhanced photocatalytic dye degradation and hydrogen production ability of Bi25FeO40-rGO nanocomposite and mechanism insight

Publisher: Springer Science and Business Media LLC

Date: 23-07-2018

DOI: 10.1038/S41598-018-29402-W

Abstract: A comprehensive comparison between BiFeO 3 -reduced graphene oxide (rGO) nanocomposite and Bi 25 FeO 40 -rGO nanocomposite has been performed to investigate their photocatalytic abilities in degradation of Rhodamine B dye and generation of hydrogen by water-splitting. The hydrothermal technique adapted for synthesis of the nanocomposites provides a versatile temperature-controlled phase selection between perovskite BiFeO 3 and sillenite Bi 25 FeO 40 . Both perovskite and sillenite structured nanocomposites are stable and exhibit considerably higher photocatalytic ability over pure BiFeO 3 nanoparticles and commercially available Degussa P25 titania. Notably, Bi 25 FeO 40 -rGO nanocomposite has demonstrated superior photocatalytic ability and stability under visible light irradiation than that of BiFeO 3 -rGO nanocomposite. The possible mechanism behind the superior photocatalytic performance of Bi 25 FeO 40 -rGO nanocomposite has been critically discussed.

Large difference between the magnetic properties of Ba and Ti co-doped BiFeO₃bulk materials and their corresponding nanoparticles prepared by ultrasonication

Publisher: IOP Publishing

Date: 31-05-2016

DOI: 10.1088/0022-3727/49/26/265003

Silver incorporated α-MoO3 nanoplates to nanorods: Exploring the effects of doping on structural, morphological and optical properties

Publisher: Elsevier BV

Date: 06-2021

DOI: 10.1016/J.MTCOMM.2021.102404

Chittagong University Of Engineering And Technology

Location: Bangladesh

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Bangladesh University Of Engineering And Technology

Location: Bangladesh

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Jagannath University

Location: Bangladesh

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School Of Chemical Engineering And Advanced Materials, University Of Adelaide

Location: Australia

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