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Cover Picture: Luminescence of Polyethylene Glycol Coated CdSeTe/ZnS and InP/ZnS Nanoparticles in the Presence of Copper Cations (ChemPhysChem 12/2011)
Author(s) -
Beaune Grégory,
Tamang Sudarsan,
Bernardin Aude,
BayleGuillemaud Pascale,
Fenel Daphna,
Schoehn Guy,
Vinet Françoise,
Reiss Peter,
Texier Isabelle
Publication year - 2011
Publication title -
chemphyschem
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201190059
Subject(s) - quantum dot , photoluminescence , copper , luminescence , nanoparticle , quenching (fluorescence) , zinc sulfide , materials science , polyethylene glycol , chemistry , transmission electron microscopy , nanotechnology , fluorescence , zinc , optoelectronics , physics , organic chemistry , quantum mechanics , metallurgy
Click chemistry is an appealing approach for the covalent coupling of fragile biomolecules such as oligonucleotides, peptides or protein templates to the surface of fluorescent quantum dots. However, click chemistry requires the use of copper cations as catalysts, which irreversibly quench the photoluminescence of quantum dots. On p. 2247 I. Texier et al. demonstrate by means of energy‐filtered transmission electron microscopy (EFTEM) that the copper ions are incorporated into the ZnS shell of polyethyleneglycol‐capped CdSeTe/ZnS core/shell quantum dots, shedding new light on the quenching mechanism. The image shows the EFTEM cadmium, copper and zinc chemical maps of 7 nm×13 nm CdSeTe/ZnS quantum dots as well as their superposition.