Date of Graduation

Summer 2020

Degree

Master of Science in Materials Science

Department

Physics, Astronomy, and Materials Science

Committee Chair

Kartik Ghosh

Keywords

core shell nanoparticles, barium titanate, carbon, Raman spectroscopy, X-ray diffraction, scanning electron microscopy (SEM), fluorescence spectroscopy

Subject Categories

Other Physics

Abstract

Core-shell nanoparticles (CSNP) with fascinating ferroelectric properties have diverse applications in biotechnology and the electronic field of studies. Among so many perovskites, barium titanate (BTO) nanoparticles draw much interest due to their distinct electronic and ferroelectric features. Additionally, the incorporation of carbon in the shell of CSNP makes it suitable for application in many fields due to its innocuous nature. Carbon not only increases the biocompatible properties of an element but also gives mechanical stability to the CSNP. This thesis is targeted towards the synthesis of oxide-carbide CSNP, where the core is made of BTO and the shell is made of carbon. The effect of nitrogen doping on these CSNP has also been investigated. Two unique techniques sono-chemical and pulsed laser ablation are used to synthesize the CSNP. X-ray diffraction (XRD) analysis indicates that the crystal structure of the core BTO nanoparticles remains intact.. Raman spectroscopy data shows the presence of all vibrational modes of BTO and carbon indicating the formation of CSNP. Scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopic (EDS) analysis provide the surface morphology and the occupancy of prominent elements in the synthesized CSNP. The growth of carbon around the surface of BTO nanoparticles is confirmed through transmission electron microscopy (TEM). The line scan on high-resolution TEM (HR-TEM) images confirms the formation of CSNPs. To enhance the optical properties of synthesized CSNP, the shell was doped with a nonmetal like nitrogen. The contrast in the fluorescence spectra between the doped and un-doped samples confirms the incorporation of different functional groups and reveals the effect of nitrogen doping. The incorporation of various functional groups in the carbon shell of CSNP will help in targeted drug delivery applications.

Copyright

© Moudip Nandi

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