Formation of a Colloidal CdSe and ZnSe Quantum Dots via a Gamma Radiolytic TechniqueReportar como inadecuado


Formation of a Colloidal CdSe and ZnSe Quantum Dots via a Gamma Radiolytic Technique


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1

Department of Physics, University Putra Malaysia, Serdang 43400, Selangor, Malaysia

2

Young Researchers and Elite Club, Shahr-e-Qods Branch, Islamic Azad University, Tehran 37541-374, Iran

3

School of Applied Physics, Faculty of Science and Technology, University Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia





*

Author to whom correspondence should be addressed.



Academic Editor: Philippe Lambin

Abstract Colloidal cadmium selenide CdSe and zinc selenide ZnSe quantum dots with a hexagonal structure were synthesized by irradiating an aqueous solution containing metal precursors, poly vinyl pyrrolidone, isopropyl alcohol, and organic solvents with 1.25-MeV gamma rays at a dose of 120 kGy. The radiolytic processes occurring in water result in the nucleation of particles, which leads to the growth of the quantum dots. The physical properties of the CdSe and ZnSe nanoparticles were measured by various characterization techniques. X-ray diffraction XRD was used to confirm the nanocrystalline structure, energy-dispersive X-ray spectroscopy EDX was used to estimate the material composition of the samples, transmission electron microscopy TEM was used to determine the morphologies and average particle size distribution, and UV-visible spectroscopy was used to measure the optical absorption spectra, from which the band gap of the CdSe and ZnSe nanoparticles could be deduced. View Full-Text

Keywords: gamma radiolytic technique; CdSe; ZnSe; quantum dots; particle size; band gap gamma radiolytic technique; CdSe; ZnSe; quantum dots; particle size; band gap





Autor: Aeshah Salem 1,* , Elias Saion 1, Naif Mohammed Al-Hada 1, Abdul Halim Shaari 1, Halimah Mohamed Kamari 1, Nayereh Soltani 2 and Shahidan Radiman 3

Fuente: http://mdpi.com/



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