Variation in luminescence and bandgap of Zn-doped SnO2 nanoparticles with thermal decomposition

Abstract

Zn doped Tin oxide (SnO 2 :Zn) nanoparticles have been synthesized by the chemical precipitation route with different thermal decomposition temperatures having emission intensities in visible light and narrowed bandgap. Band gap narrowing and emission intensities can be controlled by doping and calcination. The average particle sizes estimated by TEM agree with those calculated by XRD to be around 18.48 and 21.44 nm and the optical bandgap values found to be 1.30 and 2.52 eV in SnO 2 :Zn annealed at 400 and 600°C, respectively. Blue shift in bandgap and decrease in photoluminescence intensity is noticed in (SnO 2 :Zn) nanoparticles with high annealing temperature, which is due to large grain sizes. As the grain sizes grow so defect density decreases and crystallanity increases. These defects act as luminescent centers and cause decrease in emission intensity and increase in band gap.

Binary Zn-Doped SnO2/Al2O3 Nanotube Composites for Visible-Light-Driven Photocatalytic Degradation of Basic Blue 41

“…Moreover, there is only one strong and broad yellow-green emission band centered at 561 nm (2.21 eV) instead of near band edge (NBE) emission in the SnO 2 nanotubes, which is consistent with PL results reported by other researchers . Similarly, Zulfiqar et al observed a broad and very strong emission peak in the visible region at 582 nm (2.13 eV), due to the defect in Zn-doped SnO 2 nanoparticles calcined at 600 °C . In other research, Lan et al investigated the photoluminescence properties of the SnO 2 /ZnO hierarchical nanostructures synthesized by the thermal evaporation method .…”

“…59 Similarly, Zulfiqar et al observed a broad and very strong emission peak in the visible region at 582 nm (2.13 eV), due to the defect in Zn-doped SnO 2 nanoparticles calcined at 600 °C. 60 In other research, Lan et al investigated the photoluminescence properties of the SnO 2 /ZnO hierarchical nanostructures synthesized by the thermal evaporation method. 61 Contrary to our results, they observed two emission peaks located at ∼380 nm, which were related to free-exciton recombination at the NBE of ZnO and 520 nm related to the surface oxygen vacancy.…”

Comparative Study of Sonophotocatalytic, Photocatalytic, and Catalytic Activities of Magnesium and Chitosan-Doped Tin Oxide Quantum Dots

“…The FTIR technique was used to investigate the functional groups in the pristine and Mg/CS-doped SnO 2 QDs, as demonstrated in Figure b. Pure SnO 2 QDs confirm the Sn–O–Sn bending and stretching and C–O stretching vibrations at 530, 640, and 2301 cm –1 bands, respectively . The transmission bands at 3356 and 1633 cm –1 can be allocated to the O–H vibration .…”

Photocatalytic Activity of Pure and Zinc Doped Tin Oxide Nanoparticles Synthesized by One Step Direct Injection Flame Synthesis

“…Due to the doping of Zn ions in the SnO 2 lattice there arises new electron-hole pairs and oxygen vacancy sites mainly to maintain charge neutrality of the crystal [20,23,36]. The red emission peaks in the Zn:SnO 2 is due to the recombination of electrons which are trapped at the oxygen vacancy with the dopant related deep level surface defects [44,45]. This confirms that doping introduces more surface related defects compared to the pure sample.…”