Influence of different materials on the microstructure and optical band gap of α-Fe2O3 nanoparticles

Abstract

Composites of hematite (α-Fe 2 O 3 ) nanoparticles with different materials (NiO, TiO 2 , MnO 2 and Bi 2 O 3 ) were synthesized. Effects of different materials on the microstructure and optical band gap of α-Fe 2 O 3 nanoparticles were studied. Crystallite size and strain analysis indicated that the pure α-Fe 2 O 3 nanoparticles were influenced by the presence of different materials in the composite sample. Crystallite size and strain estimated for all the samples followed opposite trends. However, the value of direct band gap decreased from ∼2.67 eV for the pure α-Fe 2 O 3 nanoparticles to ∼2.5 eV for α-Fe 2 O 3 composites with different materials. The value of indirect band gap, on the other hand, increased for all composite samples except for α-Fe 2 O 3 /Bi 2 O 3 .

Increased UV absorption properties of natural hydroxyapatite‐based sunscreen through laser ablation modification in liquid

“…Literature reports that the absorption features of α‐Fe 2 O 3 nanoparticles can be affected by different parameters, which include the shape and the dimensions of the nanoparticles, and the crystallite size . The chemical environment of the particles can also play a role . The data reported here confirm this, as the relative intensities of the different peaks varies from sample FeHAp_2.5_G6 to FeHAp_2.5_I6, indicating that the optical properties may depend on various factors, and not just on the chemical composition of the samples.…”

Microstructure and photocatalytic activity of electrospun carbon nanofibers decorated by TiO 2 nanoparticles from hydrothermal reaction/blended spinning

“…In recent years, many kinds of semiconductor metal oxides, such as TiO 2 , Fe 2 O 3 , ZnO [5][6][7] and so forth, were prepared to be used as the photocatalysts to treat the dye pollution. As the most promising photocatalysts, TiO 2 has attracted extensive attention due to its low cost, no toxicity, high photosensitivity, and chemical stability [8][9][10].…”

TiO2/Fe2O3 heterostructures with enhanced photocatalytic reduction of Cr(vi) under visible light irradiation

“…The bandgap is estimated from the intercept of the extrapolated linear t to the Tauc plot. 38 Both TiO 2 and Fe 2 O 3 is well known to have an indirect band gap, [44][45][46] so we plotted (ahn) 0.5 versus photon energy to calculate the bandgap energies of TiO 2 and Fe 2 O 3 (Fig. 6b).…”