|
|||||
|
|
Direct coating of quantum dots with silica shell |
|
| Authors: | Yoshio Kobayashi Takuya Nozawa Tomohiko Nakagawa Kohsuke Gonda Motohiro Takeda Noriaki Ohuchi Atsuo Kasuya |
| Institution: | (1) Department of Biomolecular Functional Engineering, College of Engineering, Ibaraki University, 4-12-1 Naka-narusawa-cho, Hitachi Ibaraki, 316-8511, Japan;(2) Division of Surgical Oncology, Graduate School of Medicine, Tohoku University, Seiryo-machi, Aoba-ku, Sendai Miyagi, 980-8574, Japan;(3) Center for Interdisciplinary Research, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai-shi Miyagi, 980-8578, Japan |
| Abstract: | 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 × 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. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |