Premium
Enhanced Photostability from CdSe(S)/ZnO Core/Shell Quantum Dots and Their Use in Biolabeling
Author(s) -
Aldeek Fadi,
Mustin Christian,
Balan Lavinia,
Medjahdi Ghouti,
RoquesCarmes Thibault,
Arnoux Philippe,
Schneider Raphaël
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201000790
Subject(s) - quantum dot , chemistry , transmission electron microscopy , nanocrystal , shell (structure) , nanorod , hydrothermal circulation , chemical engineering , nanotechnology , hydrolysis , hydrothermal synthesis , materials science , organic chemistry , engineering , composite material
We report on the preparation and on the photophysical and structural characterization of alloyed CdSe(S) nanocrystals, which are covered by a ZnO shell. CdSe(S) QDs were prepared by reaction of CdCl 2 with NaHSe in the presence of 3‐mercaptopropionic acid (MPA) under hydrothermal conditions. The incorporation of sulfur arises from the surface‐mediated MPA hydrolysis on the growing QD surface. Water‐dispersible CdSe(S) QDs were successfully capped with a ZnO shell obtained by basic hydrolysis of Zn(OAc) 2 . The experimental results from transmission electron microscopy (TEM) imaging and powder X‐ray diffractometry (XRD) analyses indicate that the core/shell CdSe(S)/ZnO QDs have a very small diameter (ca. 2.8 nm) and exhibit a face‐centered cubic crystal structure. Our results show that core/shell CdSe(S)/ZnO QDs have a higher photostability than CdSe(S) cores. CdSe(S)/ZnO QDs have potential applications asfluorescent biological labels and were successfully used for imaging Schewanella oneidensis bacterial biofilms.