Unravelling the effect of Ni doping on the structural, optical and dielectric properties of nanocrystalline SnO2

Green Synthesis of Ni/Fe3O4/rGO Nanocomposites for Desulfurization of Fuel

“…where the wavelength is 0.15418 nm (CuK), K is the so-called shape factor (0.9), β is the full width at half-maximum (fwhm), and θ is Bragg's angle of the most prominent peak. 45 The diffraction peaks of all samples were observed at 2θ = 100) planes, respectively, also appeared in all the samples. 46 It is important to note that the second weak peak of rGO merged with the characteristic peak of Fe 3 O 4 with the (400) plane.…”

“…From the XRD pattern, the average crystallite size ( D ) of all the samples may be estimated by using the Debye–Scherrer formula (eq ). italicD = italicK λ / β .1em cos nobreak0em.25em⁡ θ where the wavelength is 0.15418 nm (CuK), K is the so-called shape factor (0.9), β is the full width at half-maximum (fwhm), and θ is Bragg’s angle of the most prominent peak . The diffraction peaks of all samples were observed at 2θ = 30.191°, 35.38°, 43.22°, 53.63°, 57.17°, and 62.78° corresponding to characteristic peaks of the Fe 3 O 4 cubic structure (JCPDS No.…”

Eco-friendly synthesis of an α-Fe2O3/rGO nanocomposite and its application in high-performance asymmetric supercapacitors

“…60 k = A ( E − E g ) n where A is a constant that depends on the properties of the material, E is the energy of a photon, E g is the width of the band, and n is a variable that can take the values 1/2 for a direct electronic transition and 2 for an indirect one. 61…”

“…where A is a constant that depends on the properties of the material, E is the energy of a photon, E g is the width of the band, and n is a variable that can take the values 1/2 for a direct electronic transition and 2 for an indirect one. 61 Table S4 (ESI †) depicts the summary of the entire spectrum. It was discovered that the a-Fe 2 O 3 /rGO NC absorbed more visible light than the a-Fe 2 O 3 NPs, with a maximum absorption peak at about 450-575 nm; this suggests that the carbon sheets could aid in absorbing significantly more UV-visible light.…”

Effect of Fe Doping on Photocatalytic Dye-Degradation and Antibacterial Activity of SnO2 Nanoparticles

“…The quantum confinement effect cannot be treated as the reason for band gap reduction, since the crystallite size reduction does not increase the band gap here. Thus, the oxygen vacancies are considered as the sole reason for the band gap reduction in the present work [29].…”