Effects of rare earth ions (Tb, Ce, Eu, Dy) on the thermoluminescence characteristics of sol–gel derived and γ‐irradiated SiO₂ nanoparticles

Abstract

Highly pure SiO2 and SiO2 :RE nanoparticles were synthesized by the sol-gel method. The morphological, structural and optical properties of the nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). XRD results indicate that all the samples studied were free from impurities. SEM/TEM results indicate that the samples were well dispersed. Surface characterization of the nanocrystals by Fourier transform infrared spectroscopy has been carried out and the structure of surface-bound SiO2 based on spectral analysis is proposed. Thermoluminescence (TL) characteristics were investigated to study the influence of rare earth dopants (Tb, Ce, Eu, Dy) on SiO2 matrix subjected to 0.5 kG (1 h) γ-irradiation. Among these rare earth elements, Eu(3+) was found to be the most efficient dopant for SiO2 showing maximum thermoluminescence intensity. SiO2 :Eu0.5 seems to be a promising candidate for use as a TL dosimeter.

Influence of Silica Nano-Additives on Performance and Emission Characteristics of Soybean Biodiesel Fuelled Diesel Engine

“…This also illustrates the presence of SiO 2 nano-additives with no other significant impurities. The results are consistent with the International Centre for Diffraction Data (JCPDS) [29,30]. Figure 4 illustrates the EDS analysis of the SiO 2 nanoadditive.…”

Green synthesis of SiO2 nanoparticles from Rhus coriaria L. extract: Comparison with chemically synthesized SiO2 nanoparticles

“…It can be stated that the peaks were matched with the reference JCPDS file No. 89-0510 for SiO 2, and it discloses no impurities peak for SiO 2 [48].…”

Tribological Investigation of Self-Lubricated Al-SiC-Kaoline Hybrid Composite Under Dry, Oil and Nanofluids Lubricating Conditions Fabricated Through Spark Plasma Sintering Technique.

“…A similar Al 2 Cu peak was identi ed by the researchers Anbukkarasi R et al, [28], Shakir Gatea et al, [29] and Hailan Ma et al, [30] in their studies. The presence of SiO2 (JCPDS le number 46-1045 [31,32]), Al 2 O 3 (JCPDS le number 00-046-1212 [33]), TiO 2 (JCPDS le number 21-1276 [34]), Cao (JCPDS le number 00-037-1497 [35]) and MgO (JCPDS le number 59-7746 [36]) peaks in the fabricated HMMC were con rmed through XRD analysis. The existence of difference in coe cient of thermal expansions of the agglomerations and the reinforcement particles tends to decrease the load-bearing capability of the HMMC and causes the degradation of strength of the composite material [37,38].…”