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Synthesis and determination of the number of [CdSe] units per CdSe nanoparticle
Abstract
A method for determining nanoparticle concentration was employed, working on the idea that once the extinction coefficient of the nanoparticles has been determined, the concentration can be obtained by simply taking an absorption spectrum of the sample. The extinction coefficient per mole of CdSe nanoparticle at the first excitonic absorption peak, є was found to be strongly dependent on the size of the nanoparticle, between a square and cubic dependence. The measurements were carried out using purified nanoparticles. A protocol was developed using electroanalysis (ECA) and atomic absorption spectroscopy (AAS) techniques to analyse the Cd2+ ion concentration of the CdSe nanoparticles. The prepared CdSe nanoparticles were digested in acid and Cd2+ ion present in the solution was determined, it was found practically that there are 1000[CdSe] units per nanoparticle. Theoretical calculations gave 1282[CdSe] units per nanoparticle.
Keywords: Cadmium selenide, nanoparticle, absorption spectrum, atomic absorption spectroscopy (AAS), electroanalysis (ECA).
Keywords: Cadmium selenide, nanoparticle, absorption spectrum, atomic absorption spectroscopy (AAS), electroanalysis (ECA).
