Enhancing the photoluminescence of peptide-coated nanocrystals with shell composition and UV irradiation.
The composition and structure of inorganic shells grown over CdSe semiconductor nanocrystal dots and rods were optimized to yield enhanced photoluminescence properties after ligand exchange followed by coating with phytochelatin-related peptides. We show that, in addition to the peptides imparting superior colloidal properties and providing biofunctionality in a single-step reaction, the improved shells and pretreatment with UV irradiation resulted in high quantum yields for the nanocrystals in water. Moreover, peptide coating caused a noticeable red-shift in the absorption and emission spectra for one of the tested shells, suggesting that exciton-molecular orbital (X-MO) coupling might take place in these hybrid inorganic-organic composite materials.
Tsay
James M
JM
Department of Chemistry and Biochemistry, and Department of Physiology, University of California at Los Angeles, Los Angeles, California 90095, USA.
Doose
Sören
S
Pinaud
Fabien
F
Weiss
Shimon
S
D019187:Cadmium Compounds / Q000737:chemistry; D002625:Chemistry, Organic / Q000379:methods; D002627:Chemistry, Physical / Q000379:methods*; D003102:Colloids / Q000737:chemistry; D005978:Glutathione / Q000737:chemistry; D008027:Light; D049449:Luminescence; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D010455:Peptides / Q000737:chemistry; D054811:Phytochelatins; D018036:Selenium Compounds / Q000737:chemistry; D012666:Semiconductors; D013440:Sulfides / Q000737:chemistry; D014466:Ultraviolet Rays; D017967:Zinc Compounds / Q000737:chemistry
D019187:Cadmium Compounds; D003102:Colloids; D010455:Peptides; D018036:Selenium Compounds; D013440:Sulfides; D017967:Zinc Compounds; C034939:cadmium sulfide; D054811:Phytochelatins; C058667:cadmium selenide; D005978:Glutathione; C031238:zinc sulfide