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http://dx.doi.org/10.5229/JKES.2011.14.1.001

Phase-and Size-Controlled Synthesis of CdSe/ZnS Nanoparticles Using Ionic Liquid  

Song, Yun-Mi (Department of Chemistry, Korea University)
Jang, Dong-Myung (Department of Chemistry, Korea University)
Park, Kee-Young (Department of Chemistry, Korea University)
Park, Jeung-Hee (Department of Chemistry, Korea University)
Cha, Eun-Hee (Graduate School of Green Energy Engineering, Hoseo University)
Publication Information
Journal of the Korean Electrochemical Society / v.14, no.1, 2011 , pp. 1-8 More about this Journal
Abstract
Ionic liquids are room-temperature molten salts, composed of organic mostly of organic ions that may undergo almost unlimited structural variation. We approach the new aspects of ionic liquids in applications where the semiconductor nanoparticles used as sensitizers of solar cells. We studied the effects of ionic liquids as capping ligand and/or solvent, on the morphology and phase of the CdSe/ZnS nanoparticles. Colloidal CdSe/ZnS nanoparticles were synthesized using a series of imidazolium ionic liquids; 1-R-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([RMIM][TFSI]), where R = ethyl ([EMIM]), butyl ([BMIM]), hexyl ([HMIM]), octyl ([OMIM]). The average size of nanoparticles was 8~9 nm, and both zinc-blende and wurtzite phase was produced. We also synthesized the nanoparticles using a mixture of trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide ([$P_{6,6,6,14}$][TFSI]) and octadecene (ODE). The CdSe/ZnS nanoparticles have a smaller size (5.5 nm) than that synthesized using imidazolium, and with a controlled phase from zinc-blende to wurtzite by increasing the volume ratio of [$P_{6,6,6,14}$][TFSI]. For the first time, the phase and size control of the CdSe/ZnS nanoparticles was successfully demonstrated using those ionic liquids.
Keywords
Ionic liquids; Imidazolium; Phosphonium; Solovothermal synthesis; CdSe/ZnS nanoparticles; Phase and size control;
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