Open AccessEstimation of hydrothermally synthesized Iron incorporated 2D-sheet-like α-MoO3 microstructural and optical parameters treated by annealing temperature
Author(s) -
Sapan Kumar Sen,
M.S. Manir,
Salahuddin Nur,
M. N. Hossain,
M. Robiul Islam,
A.K.M.M. Alam,
M. A. Hakim
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/abb4f9
Subject(s) - materials science , crystallinity , crystallite , annealing (glass) , orthorhombic crystal system , dopant , doping , band gap , hydrothermal circulation , analytical chemistry (journal) , impurity , mineralogy , chemical engineering , crystal structure , crystallography , composite material , metallurgy , optoelectronics , chemistry , organic chemistry , chromatography , engineering
In this article, pure and Fe-doped (5 wt.%) α -MoO 3 nanosheets have been synthesized by hydrothermal approach and doped nanosheets were further annealed (at T a = 600 °C and T a = 700 °C temperatures for 3 hrs) for improved crystalline properties. The XRD analysis revealed the formation of orthorhombic structure without tracing of impurities or secondary phases. The iron dopant and annealing temperatures improved the crystallinity as the crystallite size increased. The pristine sample consists with randomly oriented nanosheets with an average width of 100–200 nm and length of several micrometers. Doping with iron does not induce any noticeable effect on morphology of α -MoO 3 , as revealed by FESEM imaging. The doped nanosheets form a large, rectangular plate-type layered structure at 600 °C. Nanosheets with more developed and smooth surfaces with sharp corners and edges were observed at an elevated temperature of 700 °C. EDX study confirmed the Fe incorporation. The presence of different functional groups was analyzed by FTIR spectra. As a result of Fe doping, the band gap has decreased by 10% from an intrinsic value of ∼3.00 eV. The thermal annealing step further modifies the optical bandgap, providing an extracted value of 2.85 eV in this study.