Synthesis and characterization of Mn-doped CdSe quantum dots via inverse micelle technique / Nor Aliya binti Hamizi

Nor Aliya, Hamizi (2017) Synthesis and characterization of Mn-doped CdSe quantum dots via inverse micelle technique / Nor Aliya binti Hamizi. PhD thesis, University of Malaya.

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      Abstract

      Various sizes of manganese-doped cadmium selenide quantum dots (Mn-doped CdSe QDs) synthesized using inverse Micelle technique with organic solvent and surfactant possesses zinc blende structure with physical size ranging from 3 to 14 nm and crystallite size 2.46 to 5.46 nm respectively for 0 to 90 mins samples with narrow size distribution. Mn-doped CdSe QDs observed to growth larger QDs compared to pure CdSe QDs at significantly same reaction times. The lattice parameter compressed with QDs sizes growth due to the introduction of lattice strain due to the incorporation of Mn atoms into CdSe QDs lattice. The Mn-doped CdSe QDs shows a slight blue-shift on absorption and emission spectra’s compared to pure CdSe even though is possessed larger QDs. The band gap structure modification prominently affected by the lattice strain were transition of Stoke`s, Rayleigh to anti-Stoke`s shifts observed as the Mn doped CdSe QDs size growth. The typical red-shift of absorption and emission wavelength observed with growth of QDs sizes. The role of oleic acid acid as a surfactant and capping agent shows in FTIR spectra. The lattice strain tailored the binding energy between the ion prominently on the surface of the QDs with growth of QDs sizes.

      Item Type: Thesis (PhD)
      Additional Information: Thesis (Ph.D.) –- Faculty of Engineering, University of Malaya, 2017
      Uncontrolled Keywords: Organic solvent; Physical size; Mn-doped CdSe; zinc blende structure; Quantum dots; Reversed micelles
      Subjects: T Technology > TA Engineering (General). Civil engineering (General)
      T Technology > TJ Mechanical engineering and machinery
      Divisions: Faculty of Engineering
      Depositing User: Mr Mohd Safri Tahir
      Date Deposited: 07 Jul 2017 16:47
      Last Modified: 07 Jul 2017 16:47
      URI: http://studentsrepo.um.edu.my/id/eprint/7428

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