A Facile, Two-step Synthesis and Characterization of Fe3O4-Lcysteine- Graphene Quantum Dots as a Multifunctional Nanocomposite

Alaghmand Fard, Amir Hossein | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53192 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Madah Hosseini, Hamid Reza
  7. Abstract:
  8. In this research, a facile, two-step synthesis was reported for 34-LCysteine- nanocomposites. The first step comprises the preparation of LCysteine functionalized magnetic nanoparticles (MNPs) core-shell structures via co-precipitation method. In the second step, graphene quantum dots (GQDs), which were synthesized by citric acid carbonization, added to the functionalized MNPs and finally refluxed at the appropriate time and temperature. LCysteine as a biocompatible, natural amino acid were used to link MNPs with GQDs. This nanocomposite was characterized by various techniques. XRD and FT-IR were used to investigate the formation of MNPs and LCysteine existence on the MNPs surface. XPS measurements revealed the formation of LCysteine bands on the MNPs surface.Morphology and size distribution of nanoparticles were revealed by SEM and TEM micrographs. Additionally, thermal analyses were used to calculate the LCysteine layer density in the core-shell structure. Finally, magnetic and optical properties of the nanocomposite were measured by VSM technique and photoluminescence spectroscopy.The results show that 34-LCysteine- nanocomposite exhibits a superparamagnetic behavior with the strong and stable emission in the visible range. Therefore, 34-LCysteine- nanostructure may be considered as a potential multifunctional nanocomposite with magnetic and optical properties, simultaneously, which can be used in biomedical applications, especially bioimaging
  9. Keywords:
  10. Magnetite Nanoparticle ; Graphene Quantum Dots (GQDs) ; Optical Properties ; Magnetic Properties ; L Cysteine ; Biomedical Applications

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