Synthesis and analysis of Novel Platinum group Metal Chalcogenide Metal Quantum Dot and Electrochemical Markers

dc.contributor.advisorIwuoha, Emmanuel I
dc.contributor.authorNxusani, Ezo
dc.date.accessioned2018-09-26T09:07:02Z
dc.date.accessioned2024-05-09T10:52:05Z
dc.date.available2018-12-31T22:10:06Z
dc.date.available2024-05-09T10:52:05Z
dc.date.issued2018
dc.descriptionMagister Scientiae - MSc (Chemistry)
dc.description.abstractAlthough cadmium and lead chalcogenide quantum dot have excellent optical and photoluminescent properties that are highly favorable for biological applications, there still exists increasing concerns due to the toxicity of these metals. We, therefore, report the synthesis of new aqueous soluble IrSe quantum dot at room temperature utilizing a bottom-up wet chemistry approach. NaHSe and H2IrCl6 were utilized as the Se and Ir source, respectively. High-resolution transmission electron microscopy reveals that the synthesized 3MPA-IrSe Qd are 3 nm in diameter. The characteristics and properties of the IrSe Qd are investigated utilizing, Selected Area electron diffraction, ATR- Fourier Transform Infra-Red Spectroscopy, Energy Dispersive X-ray spectroscopy, Photoluminescence, Cyclic Voltammetry and chronocoulometry. A 3 fold increase in the optical band gap of IrSe quantum dot in comparison to reported bulk IrSe is observed consistent with the effective mass approximation theory for semiconductor materials of particles sizes < 10 nm. The PL emission of the IrSe quantum dot is at 519 nm. Their electro-activity is studied on gold electrodes and exhibit reduction and oxidation at - 107 mV and +641 mV, with lowered reductive potentials. The synthesized quantum dot are suitable for low energy requiring electrochemical applications such as biological sensors and candidates for further investigation as photoluminescent biological labels.
dc.identifier.urihttps://hdl.handle.net/10566/14650
dc.language.isoen
dc.publisherUniversity of the Western Cape
dc.rights.holderUniversity of the Western Cape
dc.subjectPlatinum group metal, Chalcogenide, Room temperature synthesis of nanocrystals, Quantum dots, Backscattering electron - high resolution single electron microscopy, Electrochemistry, Nucleoside synthesis, Mass spectrometry, DNA sequencing, Enzyme
dc.titleSynthesis and analysis of Novel Platinum group Metal Chalcogenide Metal Quantum Dot and Electrochemical Markers

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