Cadmium sulfide and cadmium selenide/cadmium sulfide nanoparticles stabilized in water with poly(cysteine acrylamide).
Cysteine acrylamide (N-acryloyl L-cysteine) stabilizes CdS nanoparticles as the particles form in aqueous dispersions. Cysteine acrylamide also exchanges for citrate on the surfaces of CdSe and core/shell CdSe/CdS nanoparticles to provide greater stability. Heating of the nanoparticle dispersions polymerizes the cysteine acrylamide on the surface to form a more efficient polydentate stabilizer. The polymer-coated nanoparticle dispersions are colloidally stable even after removal of low molecular weight solutes by dialysis. Emission quantum yields of the polymer-coated CdSe and CdSe/CdS samples were 0.9% and 2.6%, respectively, after aging of the samples in light. CdSe/CdS coated with poly(cysteine acrylamide) is colloidally stable for at least two years in the dark at 5 degrees C.
Sherman
Robert L
RL
Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
Chen
Yiyan
Y
Ford
Warren T
WT
D000180:Acrylic Resins / Q000032:analysis / Q000737:chemistry*; D000327:Adsorption; D019187:Cadmium Compounds / Q000032:analysis / Q000737:chemistry*; D003102:Colloids / Q000032:analysis / Q000737:chemistry*; D003545:Cysteine / Q000032:analysis / Q000737:chemistry*; D008422:Materials Testing; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D018036:Selenium Compounds / Q000032:analysis / Q000737:chemistry*; D012996:Solutions; D013440:Sulfides / Q000032:analysis / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
D000180:Acrylic Resins; D019187:Cadmium Compounds; D003102:Colloids; D018036:Selenium Compounds; D012996:Solutions; D013440:Sulfides; C500690:poly(cysteine acrylamide); C034939:cadmium sulfide; D014867:Water; C058667:cadmium selenide; D003545:Cysteine