Synthesis and characterisation of PbS/Fe3O4 core shell quantum dots by microwave methodat different volume of Fe3O4

Ambok Dalek, Ambok Zulhelmi (2022) Synthesis and characterisation of PbS/Fe3O4 core shell quantum dots by microwave methodat different volume of Fe3O4. [Project Paper] (Submitted)

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Abstract

The synthesis of PbS/Fe3O4 core shell quantum dots with optimal synthesis parameters is analyzed by using photoluminescence (PL) and UV-Vis spectroscopy. The samples were prepared via microwave-assisted method. The optical properties effect on PL and UV-Vis’s spectra is observed by changing the volume of Fe3O4 between 0.2, 0.4, and 0.6 ml. For the synthesis of PbS/Fe3O4 CSQDs, the temperature used was 55 °C, and the mixture was irradiated with microwave for 2 mins. The results have clearly indicated that the PbS/Fe3O4 allow shifting the optical features to higher emission energy as the volume of Fe3O4 increases. This blueshift in PL is understood as in the frame of migration of ion and exchange mechanism taking place during the synthesis. From the analysis of PL spectra, the energy band gap of PbS and PbS/Fe3O4 (0.2, 0.4, to 0.6 ml) was changed to 0.77, 2.67, 2.68, and 2.74 eV respectively. However, the analysis of energy band gap of PbS and PbS/Fe3O4 via UV-Vis was changed to 4.85, 3.61, 3.75, to 4.0 eV for PbS and PbS/Fe3O4 (0.2, 0.4, and 0.6 ml), respectively. This different of energy between PL and UV-Vis is due to Stoke shift occurs in the PbS/Fe3O4 CSQDs.

Item Type:	Project Paper
Faculty:	Fakulti Sains
Depositing User:	Ms. ROHANA ALIAS
Date Deposited:	18 Dec 2024 08:12
Last Modified:	18 Dec 2024 08:12
URI:	http://psaspb.upm.edu.my/id/eprint/1975

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