Synthesis, Characterization and Magnetic Behavior of Cadmium Selenide Nanoparticles

Yap, Hau Yan (2019) Synthesis, Characterization and Magnetic Behavior of Cadmium Selenide Nanoparticles. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Cadmium selenide (CdSe) nanoparticles have been used for wide range of application such as laser, biochemical sensors, solar cells and others due to its tunable optical and electrical, magnetic and strong photoluminescence properties. However, the traditional and conventional methods used to prepare CdSe nanoparticles including molecular beam epitaxy, metal organic chemical deposition, solvothermal, thermal treatment and hot injection methods involve large amount of organic solvents which are not environment friendly. In order to solve this problem, water-based colloidal and solid-state method which are greener methods were used to synthesize CdSe nanoparticles in this research. The CdSe samples produced were characterized using FT-IR and UV-Vis spectroscopies. Particle size analyzer was also used to measure the particle size of the CdSe samples while magnetic susceptibility test was done to study the magnetic behavior of the CdSe samples. For colloidal method, CdSe nanoparticles were successfully produced using trisodium citrate as a capping agent, at reaction temperature of 120 ˚C and with solution pH of <7. The FT-IR analysis shows peaks at 3317.79 cm-1 and 1635.75 cm-1 indicate that the trisodium citrate has successfully capped onto the particle surface. The result of the particle analysis shows that the CdSe obtained is in nanoparticles form with size of 34.45 nm. For the CdSe samples obtained from solid-state method, the FT-IR shows a new peak at ~1074cm-1 which indicates that reaction has happened between the starting materials. The CdSe samples are not in nanoparticles size but the magnetic susceptibility analysis shows that the material possesses diamagnetic behavior