Direct coating of quantum dots with silica shell

被引：27

作者：

Kobayashi, Yoshio ^{[1
]}

Nozawa, Takuya ^{[1
,2
]}

Nakagawa, Tomohiko

Gonda, Kohsuke ^{[2
]}

Takeda, Motohiro ^{[2
]}

Ohuchi, Noriaki ^{[2
]}

Kasuya, Atsuo ^{[3
]}

机构：

[1] Ibaraki Univ, Coll Engn, Dept Biomol Funct Engn, Ibaraki 3168511, Japan

[2] Tohoku Univ, Grad Sch Med, Div Surg Oncol, Aoba Ku, Sendai, Miyagi 9808574, Japan

[3] Tohoku Univ, Interdisciplinary Res Ctr, Aoba Ku, Sendai, Miyagi 9808578, Japan

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2010年 / 55卷 / 01期

关键词：

Quantum dots; Nanoparticle; Core-shell; Silica-coating; Sol-gel; Stober method; NANOPARTICLES; PARTICLES; PROBES;

D O I：

10.1007/s10971-010-2218-5

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper describes a method for direct coating of fluorescent semiconductor nanoparticles with silica shell. The fluorescent semiconductor nanoparticles used were CdSe (x) Te1-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 x 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 x 10(-4) to 50 x 10(-4) M. The Q-dots/silica particles showed fluorescence as well as the uncoated Q-dots.

引用

页码：79 / 85

页数：7

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