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- 저자 : Ankush Kumar Tangra (검색결과 2 건)
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Tangra Ankush Kumar,Lotey Gurmeet Singh 한국물리학회 2021 Current Applied Physics Vol.27 No.-
Sol-gel method has been used for the synthesis of biocompatible superparamagnetic nanoferrites of AFeO2 (A = Li, Na, K, Ca). Structural study of the nanoferrites reveals that LiFeO2 exhibits cubic phase on the other hand NaFeO2, KFeO2, CaFeO2 nanoparticles possess orthorhombic phase. Transmission electron microscopy (TEM) suggests that synthesized nanoferrites are nano-sized with spherical morphology. Optical properties confirm that nanoferrites emit and absorb light in a visible range of the electromagnetic spectrum. International Commission on Illumination (CIE) study discloses that the nanoparticles can be used to produce light of various colors. Magnetic study reveals that the nanoferrites exhibit superparamagnetic nature with high values of saturation magnetization 40.26 emu/g, 41.69 emu/g, 57.16 emu/g, and 43.66 emu/g, respectively for LiFeO2, NaFeO2, KFeO2, and CaFeO2. Biocompatibility study of the nanoferrites has been performed using Sulforhodamine B (SRB) and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The reason behind the observed properties and behavior has been discussed.
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Optical and Luminescence Properties of β-NaFeO2 Nanoparticles
Sarbjit Singh,Ankush Kumar Tangra,Gurmeet Singh Lotey 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.5
β-NaFeO2 nanoparticles have been synthesized by sol–gel method and their morphological, structural and optical propertiesinvestigated. Transmission electron microscope study reveals that the size of the synthesis nanoparticles is 37 nm and theyare possessing spherical symmetry. X-ray diffraction pattern shows the orthorhombic crystal structure of nanoparticles withspace group Pn21a. UV–visible spectra of β-NaFeO2 divulges that these nanoparticles have direct band gap 2.35 eV. Theobserved Fourier transform infrared spectroscopy spectra confirms the presence of Fe–Na bonding at 1074 cm−1. The photoluminescencestudy of these nanoparticles shows that these nanoparticles possesses various transition in the visible spectrum.
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