Department of Physics

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Author: search.filters.author.Dr. Akbar AliSubject: search.filters.subject.SP20

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    Enhanced Sunlight Photo catalytic Activity and Biosafetsy of TiO2/ZnFe2O4 Nano composites
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2022) Muhammad Noman; CIIT/SP20-RPH-059/LHR; Dr. Akbar Ali; LHR TP 8146
    A good approach for the photo degradation of Rhodamine B (RhB) dye under UV-Visible irradiation is the use of Titanium di oxide –Zinc ferrites nanoparticles as a photo catalyst, which showed the high photo catalytic activity, highly magnetic reparability and cost-effective results. The nanoparticles of Titanium di oxide-Zinc ferrites (TiO2/ZnFe2O4 x=1 %, 3 %,) were prepared by using hydrothermal synthesis route. The structural and morphological properties of the synthesized nanoparticles studied by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), Energy dispersive spectroscopy (EDX), UV-visible spectroscopy, raman spectroscopy and Photoluminescence (PL). The structural morphology showed that prepared samples are uniform. The structural properties confirmed to be in good agreement for both XRD, and SEM results and confirmed the cubical nature of the prepared spinel. Furthermore, the increase in size of the nanoparticles with increase in Titanium di-oxide (TiO2) contents, confirmed from the diffraction peaks and SEM analysis. The size of crystallites ranged in 15.5nm evaluated by using Debye-Sharer‘s formula from more intense diffraction peak. The composition of the prepared specimen confirmed by Fourier transforms infrared spectroscopy (FTIR). Photo catalysis carried out to check the photo catalytic activity of the synthesized nanoparticles having different concentrations of , for the degradation of Rhodamine B (RhB) dye under UV-Visible light. The photo catalytic activity checked, resulted 8%, 27%, 41% and 80% for titanium di- oxide doped zinc iron oxide respectively, for the degradation of Rhodamine B (RhB) dye under UV- Visible irradiation in 0,30,60,90 and 120mins, it is concluded that the photo catalytic activity increased by increasing reaction time and the concentration of titanium di-oxide, and this can be increased up to 80 %. The prepared nanocomposite attested to be cost effective, ecofriendly, reusable after recycling, high magnetic reparability after use, and high photo catalytic activity for the photo degradation of Rhodamine B (RhB) dye under UV-Visible irradiation.
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    Up Conversion and Down Conversion Nanoparticles for Nano Medicine, Synthesis, Surface Modification, and Biological Applications.
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2021) Muhammad Sajjad Farid; CIIT/SP20-RPH-008/LHR; Dr. Akbar Ali; LHR TP 7683
    Upconversion nanoparticles (UCNPs) and down conversion nanoparticles (DCNPs) have outstanding optical characteristics and are used in a variety of disciplines such as photonics, energy and material design. They describe the mix, material, and optical characteristics, as well as the functionalization of various UCNPs and DCNPs, before focusing on continuing advancements in using usable UCNPs and DCNPs. Because it reduces the heat of biological cells given by 980 nm excitation light, the upconversion luminescence (UCL) of rare earth ions doped nanoparticles stimulated at 808 nm is more acceptable for biological applications than the UCL of rare earth ions doped nanoparticles excited at 980 nm. On the other hand, one of the major challenges to greater UCL application is the poor UCL efficiency of rare earth ions doped nanoparticles activated at 808 nm. There is a problem with rare earth UCNPs that they suffer from low up conversion efficiency and gives quantum yield of maximum 1% because they have small cross section for the absorption because of 4f-4f transition is not allowed by the mean of selection rules so, they are inefficient for practical implementation in a significant number of situations. Thus for the time being, the -NaYF4 will be used as a host material, which is chemically and optically stable and its optical transparency lies in our range of spectra and its co-doped with lanthanides Yb3+ and Nd3+ provide us the highest quantum yield. In this study, the amount of dopants Nd3+ will be kept fixed whereas Yb3+ concentration will be changed from 0-0.98g. Thus in this research proposal we will use NaYF4 host matrix and Yb3+ and Nd3+ will be used as dopants to study the down conversion emission enhancement. The spectroscopic techniques will be used to analyze for prepared geometry.
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    Synthesis and Characterization of NiFe2O4/CS Nanocomposites and its application towards Choline Biosensing
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2021) Iqra Khalid; CIIT/SP20-RPH-031/LHR; Dr. Akbar Ali; LHR TP 7715
    A non-enzymatic choline biosensor was demonstrated with chitosan (CS) supported NiFe2O4 modified on carbon paste electrode (CPE). The NiFe2O4 was synthesized via hydrothermal method to study the choline chloride (ChCl) behaviour towards the distinctive performance of choline. The prepared sample presented cost-effective choline sensing as emerged with CS formed NiFe2O4/CS and immersed with CPE. The synthesized NiFe2O4 was examined with different characterization technique to confirm the formation of specified material. X-ray diffraction (XRD), Fourier- Transmission Infrared spectroscopy (FTIR) and Raman Spectroscopy used to optimize and evaluate the various properties of prepared material. XRD confirmed the cubic inverse spinel crystal structure of NiFe2O4 with crystallite size of 14nm, while FTIR spectra revealed the stretching and bending vibration over the IR frequency range and modes confirmed through Raman spectra frequency range. The modified electrode of NiFe2O4/CS/CPE was used to perform electrochemical studies by voltammogram and evaluated through Cyclic voltammetry (CV). The CV curves taken at different working range (5-15μL) of potential 0.0-+1.0 V and quantified the analyte signal of LoD (0.002μM) considering the S/N=3 across the current system with the linear regression (R2) of 0.99. The prepared electrode showed the low (LoD) at the smaller range of the choline chloride and demonstrated good response