CdSe nanoparticles were prepared by using a simple route with Cd(NO3)2ㆍ4H2O and Na2SeSO3 in aqueous solution. Post surface modification of the CdSe nanoparticles by using thiol-alcohol was also performed to enhance the optical properties and to remove hydroxide (Cd(OH)2) impurities. CdSe nanoparticles synthesized in aqueous solution showed a zinc-blende structure and a homogeneous size distribution with a mean particle size of about 7 nm. The capping capability of 2-mercaptoethanol became active as the pH of the CdSe colloid approached neutral, the photoluminescence efficiency was significantly improved by using the post surface modification process.
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