title: Fabrication and optical properties of water soluble CdSeS nanocrystals using glycerin as stabilizing agent.
abstract: Herein we present an unusual phosphine-free method to fabricate water soluble CdSeS nanocrystals in cubic structure. In this method, glycerin was used as a stabilizing agent replacing tri-n-octylphosphine oxide (TOPO). Water solution of Na2SeO3 in polyethylene glycol was utilized as Se source. 3-Mercaptopropionic acid (MPA) provides S source. The phosphine-free Se and S sources were found to be highly reactive and suitable for the synthesis of CdSeS nanocrystals. XRD and HRTEM images confirm the formation of CdSeS nanocrystals in zinc blende structure. The absorption peaks on UV-vis spectra of as-prepared CdSeS nanocrystals are tunable from 330 nm to 440 nm, which blue shifts to shorter wavelength side in comparison with that of pure CdSe nanocrystals. The cubic CdSeS nanocrystals demonstrate narrow PL emissions spectra between 464 and 615 nm. Transmission electron microscopy images show the uniformity for the size distribution of the ternary QDs. Series water soluble CdSe(1-x)S(x) (x = 0:1) nanocrystals have also been synthesized using Na2SeO3 and Na2S solution as the Se-S co-sources. Tunable band gap energies of CdSe(1-x)S(x) (x = 0:1) nanocrystals upon chemical composition x have been achieved, the gap ranges from 290 nm to 558 nm.
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, China.
authors.forename: Fengrui
authors.initials: F
authors.lastname: Jiang
authors.forename: Guolong
authors.initials: G
authors.lastname: Tan
mesh_terms: D015097:3-Mercaptopropionic Acid / Q000737:chemistry; D019187:Cadmium Compounds / Q000737:chemistry*; D005990:Glycerol / Q000737:chemistry*; D008163:Luminescent Measurements; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D011092:Polyethylene Glycols / Q000737:chemistry; D018036:Selenium Compounds / Q000737:chemistry*; D018038:Sodium Selenite / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; D013440:Sulfides; C034939:cadmium sulfide; D014867:Water; D011092:Polyethylene Glycols; D015097:3-Mercaptopropionic Acid; D018038:Sodium Selenite; D005990:Glycerol; C025698:selenium disulfide