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10th Edition of World Nanotechnology Conference

March 10-12, 2025

March 10 -12, 2025 | Rome, Italy
World Nano 2023

Chika Scholastica Ezeaayanaso

Chika Scholastica Ezeaayanaso, Speaker at Nanotechnology Conferences
National Agency for Science and Engineering Infrastructure, Nigeria
Title : Effects of erbium nanoparticles on luminescence properties of amorphous nano silicate borotellurite glasses


Four series of rare earth doped borotellurite silicate glass were prepared by melt quenching method. The first and second series are a quaternary erbium oxide and erbium oxide nanoparticles doped glass with chemical composition {[(TeO2)0.8 (B2O3)0.2]0.8 (SiO2)0.2}1-y (RE)y, y= 0.01, 0.02, 0.03, 0.04, 0.05 molar fraction and RE = Er2O3 /Er2O3 NPs, while the third and fourth series are multicomposition [{[(TeO2)0.8 (B2O3)0.2]0.8 (SiO2)0.2}0.99 (Ag2O)0.01]1-y (RE)y where y = 0.01, 0.02, 0.03, 0.04, 0.05 molar fraction. This research proposes to extract nano silica from the coconut shell and use it to synthesize a series of selected chemical composition of borotellurite silicate glasses doped with different concentration of Er2O3 nanoparticles (NPs) and doped with Ag2O in order to study their effects on the physical, structural, optical and thermal properties. This will go a long way in turning waste into wealth. Addition of Ag2O into the glass composition modifies the optical properties of the glass system. A novel type of glasses containing rare earth ions and silver ions has recently emerged and already attracted significant attention, the reason for such interest lies in the efficient enhancement of the fluorescent properties in rare earth doped glasses when appropriate silver ions is introduced to it. Results of X-ray diffraction (XRD) confirmed the amorphous nature of the glass. The X-ray fluorescence (XRF) verified the achievement of 48.6% of silicate from coconut shell. Fourier transform infrared (FTIR) has revealed the basic structural units such as TeO4, TeO3, BO4, BO3, Si-O-Si and O-Si-O in the glass system. The presence of erbium nanoparticles in the second and fourth series was verified from transmission emission microscopy (TEM) and the size of the nanoparticles were recorded within the range of 25 – 28 nm and 41 – 50 nm. The differential scanning calorimetry (DSC) measurements indicate a good thermal stability of borotellurite silicate glasses with the values of Ts > 100 oC, and the transition temperature, Tg in all the glass series are found to increase from 437 to 511 oC, 447 to 498oC, 452 to 482 oC and 469 to 495 oC with the increasing dopants concentrations in all the four glass series. 


Dr. Mrs. Chika Scholastica Ezeaayanaso studied Industrial Chemistry at the Nnamdi Azikwe University, Awka, Nigeria and graduated with BSc in 2010. She proceeded for M.Sc at the same University and graduated with M.Sc Industrial Chemistry in 2013. She holds a Doctoral Degree in Chemistry with specialization in Analytical Chemistry and Renewable Energy from Ahmadu Bello University Zaria. She is currently a Deputy Director and head-Research and Development Unit, National Agency for Science and Engineering Infrastructure, Abuja, Nigeria. Dr. Mrs. Chika also holds distinction in “Diploma in Nutrition” from Shaw Academy, London practical professional online education. She has published over 40 research articles in SCI(E) journals with 25 conference papers and some technical reports in book of proceedings. Dr. Mrs. Chika is a Fellow Institute of Chattered Chemists Society of Nigeria, Fellow Chemical Society of Nigeria and a Member Polymer Institute of Nigeria.