Optoelectronic investigations of needle-shaped Zn_1-xSn_xO nanoparticles synthesized by coprecipitation method

Abstract

In this work, Zn1-xSnxO (x = 0, 0.01, 0.02, 0.04, 0.06 and 0.1) nanoparticles were synthesized via the coprecipitation method. The prepared nanoparticles were characterized by x-ray powder diffraction (XRD), transmission electron microscope (TEM) and Fourier transform infrared spectroscopy (FTIR). The optical investigations were utilized by UV–vis spectroscopy (UV) and photoluminescence (PL). Moreover, the electrical studies were performed through dc conductivity and dielectric measurements. The successful Sn doping in ZnO nanoparticles induced structural and electronic modifications that triggered oriented growth and gave rise to smaller nanoparticles accompanied by lower lattice distortions and strains. Sn doping had a high impact on the morphology of ZnO nanoparticles, which transformed from nearly non-specified and circular to needle-like shape. Widening of the optical band gap was observed (2.6104 eV for x = 0.00 and 3.0760 eV for x = 0.02) escorted by a decrease in the lattice disorders, as the Urbach energy was reduced (2.8445 eV for x = 0.00 and 0.9980 eV for x = 0.02). Luminescent recombination mechanisms were detected from the UV to the blue region upon excitation by 330 nm. The UV emissions were suppressed whereas the blue emissions were improved due to Sn doping, rendering the prepared nanoparticles beneficial for biological fluorescence labeling applications. The concentration of x = 0.04 showed the minimum UV emissions as well as the minimum blue emissions. Furthermore, the dc conductivity (σdc) was enhanced by Sn doping, with x = 0.04 attaining the highest value of 0.3712 Ω−1.m−1 in comparison with 0.0002 Ω−1.m−1 for x = 0.00, at 573 K. The activation energy was found to increase in the low temperature region, while it decreases in the high temperature region. The dielectric parameters were enhanced by Sn doping, which introduces surface defects and charge carriers that aid in overcoming the sintering consequences and enhancing the dielectric response.

Eu-Doped YPO4 Luminescent Nanopowders for Anticounterfeiting Applications: Tuning Morphology and Optical Properties by a Rapid Microwave-Assisted Hydrothermal Method

“…In addition, some studies have shown that rod-shaped nanoparticles have a higher dispersibility in a medium due to a higher surface–volume ratio . More surface atoms are present in the rod-shaped morphology, increasing the chemical reactivity of the prepared nanoparticles . At the same time, the luminescence centers associated with the presence of dopant ions close to the surface of the nanoparticle will also have different properties than those in the volume of the nanoparticle, being more sensitive to changes in its environment, making rod-like morphology suitable for specific applications such as optical markers.…”

“…15 More surface atoms are present in the rod-shaped morphology, increasing the chemical reactivity of the prepared nanoparticles. 54 At the same time, the luminescence centers associated with the presence of dopant ions close to the surface of the nanoparticle will also have different properties than those in the volume of the nanoparticle, being more sensitive to changes in its environment, making rod-like morphology suitable for specific applications such as optical markers. Well-crystallized Eu 3+ :YPO 4 nanorods were obtained by conventional hydrothermal process only after prolonged thermal treatments at 200 °C (for 12−18 h), 19,23 4 In our case, this morphology was obtained at much lower treatment times with considerable time and energy savings.…”

Structural, optical and magnetic properties of Ni1-2xMgxRuxO nanoparticles

“…Figure 14 represents the Tauc plots of all the prepared nanoparticles [67]. From the obtained values, listed in table 2, it can be noticed that the direct band gap energy (E g ) d increases as the codopant concentration increases.…”

A Comprehensive Study on the Effect of ZnO and ZnAl2O4 Nanoparticles on the Mechanical Properties of Epoxy Coating: Tensile and Hardness

“…The x-ray density ( ), the dislocation density (δ), and the specific surface area (S) were calculated using the following equations (El-Fadl et al, 2019;Kamareddine et al, 2020):…”