Direct Silica-Coating of Quantum Dots

被引：10
|
作者：
Kobayashi, Yoshio [1 ]
Nozawa, Takuya [1 ]
Takeda, Motohiro [2 ]
Ohuchi, Noriaki [2 ]
Kasuya, Atsuo [3 ]
机构：
[1] Ibaraki Univ, Coll Engn, Dept Biomol Funct Engn, Hitachi, 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 CHEMICAL ENGINEERING OF JAPAN | 2010年 / 43卷 / 06期
关键词：
Quantum Dots; Nanoparticle; Core-Shell; Silica-Coating; Sol-Gel; NANOPARTICLES; PROBES;
D O I：
10.1252/jcej.43.490
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
A method for direct silica-coating of fluorescent semiconductor nanoparticles is proposed. The fluorescent semiconductor nanoparticles used are quantum dots (Q-dots), which are CdSe(x)Te(1-x) nanoparticles coated with ZnS and succeedingly surface-modified with amino groups. The silica-coating was performed in the presence of the Q-dots in 1-15M H(2)O, 0.4 x 10(-4)-40 x 10(-4) M NaOH and 0.5 x 10(-4)-50 x 10(-4) M tetraethyl orthosilicate (TEOS). Silica shells were formed at 5M H(2)O and 4 x 10(-4) M NaOH. Under these concentrations of H(2)O and NaOH, the particle size of silica-coated Q-dots could be varied from 15.8 to 31.7 nm as the TEOS concentration was increased from 2.5 x 10(-4) to 50 x 10(-4) M. The silica-coated Q-dots showed fluorescence as well as the uncoated Q-dots.
引用
收藏
页码：490 / 493
页数：4
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