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photoluminescence
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The Photocatalytic and Photoluminescence Properties of Quasi Core-shell ZnO-graphene Oxide Nanoparticles
, Ph.D. Dissertation Sharif University of Technology ; Nemati, Ali (Co-Supervisor) ; Simchi, Abdollreza (Co-Supervisor) ; Kim, Choong-Un (Co-Supervisor)
Abstract
In this report, a combination of in-situ chemical synthesis and electrolysis methods was applied for the preparation of zinc oxide/graphene quasi core-shell nanoparticles. Pure zinc oxide was also prepared using the same method at different temperatures. The degree of 100 ◦C was selected for synthesizing of ZnO-GO quasi core-shell (zinc oxide as a core and few layer of graphene oxide as a shell). The particle size was 15±2 nm in all samples. In both processes, oxygen was the main reason for the connection between the core and the shell. Unlike chemical process that has all kind of functions in electrolysis process, one kind of function was produced and confirmed by FTIR. XRD patterns also...
Fluorescent Sensor from N-doped Carbon Quantum Dots for Detection of Hg2+ and I- Ions in Environmental Water
, M.Sc. Thesis Sharif University of Technology ; Samadfam, Mohammad (Supervisor) ; Sadjadi, Sudehsadat (Co-Supervisor)
Abstract
In this thesis, nitrogen-doped carbon quantum dots were synthesized from anhydrous trisodium citrate and arginine in water solvent by the hydrothermal method, which was used to develop an on-off-on fluorescence sensor. The hydrothermal method is a suitable method for the synthesis of nitrogen-doped carbon quantum dots due to its affordability, availability, rapidity, and safety. Characterization of nitrogen-doped carbon quantum dots was divided into two parts: in the first part, optical properties were investigated using fluorescence photoluminescence (PL) spectrometer and ultraviolet-visible spectrometer (UV-Vis), and in the second part, Fourier transform infrared spectrometry (FTIR),...