Structural and Optical Properties of Nanostructured Fe-Doped SnO₂

Abstract

Nanocrystalline Sn1−xFexO2 (where x = 0, 0.01, 0.02, 0.03 and 0.04) powders have been successfully synthesized by the hydrothermal method followed by sintering at 1000• C for 3 h. The morphology and structure of the samples have been analyzed by field emission scanning electron microscope and X-ray diffraction, respectively. X-ray diffraction results revealed that all diffraction peaks positions agree well with the reflection of a tetragonal rutile structure of SnO2 phase without extra peaks. The formation of a tetragonal rutile structure of SnO2 nanostructures was further supported by the Raman spectra. The band gap of Fe-doped SnO2 nanoparticles was estimated from the diffuse reflectance spectra using the Kubelka-Munk function and it was decreasing slightly with the increase of Fe ion concentration from 3.59 to 3.52 eV. The variation in band gap is attributed predominantly to the lattice strain and particle size. The presence of chemical bonding was confirmed by the Fourier transform infrared spectra.

Unraveling the Synergistic Participation of Ni–Sn in Nanostructured NiO/SnO2 for the Catalytic Transfer Hydrogenolysis of Benzyl Phenyl Ether

“…The FT-IR peak intensity decreased, and peak broadening occurred after the NiO = content was increased on the SnO 2 surface. It suggests the defect formation in the materials according to the reported literature …”

“…It suggests the defect formation in the materials according to the reported literature. 34 The surface morphologies determined using scanning electron microscopy (SEM) of SnO 2 and NiO show an irregular morphology with variable particle size (Figure 2a,b). The SEM image of nanostructured NiO(10%)/SnO 2 suggests that the surface coverage of SnO 2 took place with finely dispersed NiO nanoparticles (Figure 2c) and the NiO loading on the SnO 2 surface did not make any changes in the surface morphology of SnO 2 .…”

Fabric‐Based Wearable Self‐Powered Asymmetric Supercapacitor Comprising Lead‐Free Perovskite Piezoelectrodes

“…[ 42 ] The bands at 1646 and 3394 cm −1 correspond to an OH group's vibration and deformation frequency because the synthesis is water‐based. [ 31 ]…”

“…The Raman spectrum of the NiSnO 3 and FeSnO 3 (Figure 3i) show major bands at 620 and 570 cm −1, referring to the OSnO and OFeO vibrations, respectively. [29,31] IR bands located at 306, 519, 678, and 750 cm −1 arise from the SnO, NiO, NiO, and OSnO vibrations, respectively in the NiSnO 3 structure. In the FeSnO 3 structure, the broadband at 1310 cm −1 is attributed to the second-order scattering of hematite.…”

Influence of Cu‐Doping Concentration on the Structural and Optical Properties of SnO2 Nanoparticles by Coprecipitation Route

“…This decrease in crystal size of SnO 2 as the Cu-doping level increases suggesting that the growth was suppressed due to doping of Cu 2+ ion into Sn site. This can be attributed to the incorporation of Cu 2+ ion in the host lattice to create more nucleation sites which would increase the lattice strain by slowing down the growth of the crystals [37,39]. The density of dislocation (δ = 1/D 2 ) [35,40], where D is the crystallite size from Scherrer's formula, caused by the microstructural strain and other defects seen to increase as Cu-doping increased in the host lattice (Figure 3(b)).…”