Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 49, Pages 20962-20967Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp1051326
Keywords
-
Funding
- Japan Science and Technology Agency (JST)
Ask authors/readers for more resources
Lipophilic quantum dots (QDs, CdSe/ZnS) were encapsulated into size-controlled SiO2 beads by reflux. Slow silanization of QDs by adjusting the amount of tri-n-octylphosphine oxide (TOPO) and tetraethyl orthosilicate (TEOS) in toluene solution is the key to maintaining the initial photoluminescence efficiency. The silanized QDs formed assemblies when transferred into the aqueous phase by a condensation reaction. Beads were created after further deposition of SiO2 monomers on the assemblies. The speed of the transfer into the aqueous phase was controlled by adjusting the amount of TOPO on the surface of the QDs. Reflux was used to accelerate this transfer speed so as to prevent linear-type assemblies and degradation of the photoluminescence properties. Under optimal preparation conditions, SiO2 beads containing multiple QDs (20 +/- 2.5 per bead) were formed with a narrow size distribution (44 +/- 4 nm in diameter). Their photoluminescence efficiency was 29%, whereas the initial value in toluene was 30%. This method is applicable to the preparation of SiO2 beads encapsulating other lipophilic QDs for biological usage.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available