Silica Encapsulation of Thiol-stabilized Lead Selenide (PbSe) Quantum Dots in Aqueous Solution

Overview

Journal Mater Lett

Date 2013 Jun 5

PMID 23729944

Authors

Oliva M Primera-Pedrozo

Mehmet Ates

Zikri Arslan

Affiliations

Soon will be listed here.

Abstract

Silica encapsulation of lead selenide quantum dots (PbSe QDs) in aqueous solution is reported. Thioglycolic acid (TGA) stabilized PbSe QDs were modified with 3-mercaptopropyl trimethoxysilane (MPS) through vigorous stirring in water for 18-24 h in alkaline solution (pH 10.4-10.6). Silica shell was developed by controlled deposition and precipitation of silicates from sodium silicate solution onto MPS modified QDs surfaces. TEM images showed multiple PbSe QDs encapsulated in silica shell. The size of PbSe-SiO core-shell nanocrystals was estimated to be 25-30 nm by TEM. Elemental compositions (Pb, Se and Si) were investigated by EDX analysis. The purified colloids of PbSe-SiO QDs were stable for months when kept at 4 °C.

References

Yang P, Ando M, Murase N . Encapsulation of emitting CdTe QDs within silica beads to retain initial photoluminescence efficiency. J Colloid Interface Sci. 2007; 316(2):420-7. DOI: 10.1016/j.jcis.2007.08.058. View

Dai Q, Wang Y, Zhang Y, Li X, Li R, Zou B . Stability study of PbSe semiconductor nanocrystals over concentration, size, atmosphere, and light exposure. Langmuir. 2009; 25(20):12320-4. DOI: 10.1021/la9015614. View

Wolcott A, Gerion D, Visconte M, Sun J, Schwartzberg A, Chen S . Silica-coated CdTe quantum dots functionalized with thiols for bioconjugation to IgG proteins. J Phys Chem B. 2006; 110(11):5779-89. DOI: 10.1021/jp057435z. View

Baek I, Seok S, Pramanik N, Jana S, Lim M, Ahn B . Ligand-dependent particle size control of PbSe quantum dots. J Colloid Interface Sci. 2007; 310(1):163-6. DOI: 10.1016/j.jcis.2007.01.017. View

Darbandi M, Lu W, Fang J, Nann T . Silica encapsulation of hydrophobically ligated PbSe nanocrystals. Langmuir. 2006; 22(9):4371-5. DOI: 10.1021/la0529658. View