Direct coating of quantum dots with silica shell

Author： Kobayashi Yoshio Nozawa Takuya Nakagawa Tomohiko Gonda Kohsuke Takeda Motohiro Ohuchi Noriaki Kasuya Atsuo

ISSN： 0928-0707

Source： Journal of Sol-Gel Science and Technology, Vol.55, Iss.1, 2010-07, pp. : 79-85

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Abstract

This paper describes a method for direct coating of fluorescent semiconductor nanoparticles with silica shell. The fluorescent semiconductor nanoparticles used were CdSe_xTe_1–x nanoparticles coated with ZnS and succeedingly surface-modified with carboxyl groups, or quantum dots (Q-dots). The Q-dots were silica-coated by performing sol–gel reaction of tetraethyl orthosilicate (TEOS) using NaOH as a catalyst in the presence of the Q-dots. Quasi-perfect Q-dots/silica core-shell particles were formed at 5.0 M H₂O and 4.0 × 10⁻⁴ M NaOH. Under these concentrations of H₂O and NaOH, the particle size of Q-dots/silica particles could be varied from 20.1 to 38.1 nm as the TEOS concentration increased from 2.5 × 10⁻⁴ to 50 × 10⁻⁴ M. The Q-dots/silica particles showed fluorescence as well as the uncoated Q-dots.