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
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
收藏
页码:79 / 85
页数:7
相关论文
共 27 条
  • [1] Silica-shelled single quantum dot micelles as imaging probes with dual or multimodality
    Bakalova, Rumiana
    Zhelev, Zhivko
    Aoki, Ichio
    Ohba, Hideki
    Imai, Yusuke
    Kanno, Iwao
    [J]. ANALYTICAL CHEMISTRY, 2006, 78 (16) : 5925 - 5932
  • [2] Hollow silica nanospheres: In situ, semi-in situ, and two-step synthesis
    Darbandi, Masih
    Thomann, Ralf
    Nann, Thomas
    [J]. CHEMISTRY OF MATERIALS, 2007, 19 (07) : 1700 - 1703
  • [3] Development of acetylcholinesterase biosensor based on CdTe quantum dots/gold nanoparticles modified chitosan microspheres interface
    Du, Dan
    Chen, Shizhen
    Song, Dandan
    Li, Haibing
    Chen, Xi
    [J]. BIOSENSORS & BIOELECTRONICS, 2008, 24 (03) : 475 - 479
  • [4] Ecotoxicity of CdTe quantum dots to freshwater mussels:: Impacts on immune system, oxidative stress and genotoxicity
    Gagne, F.
    Auclair, J.
    Turcotte, P.
    Fournier, M.
    Gagnon, C.
    Sauve, S.
    Blaise, C.
    [J]. AQUATIC TOXICOLOGY, 2008, 86 (03) : 333 - 340
  • [5] Polymer coating of quantum dots -: A powerful tool toward diagnostics and sensorics
    Hezinger, A. F. E.
    Tessmar, J.
    Goepferich, A.
    [J]. EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS, 2008, 68 (01) : 138 - 152
  • [6] Mannosylated semiconductor quantum dots for the labeling of macrophages
    Higuchi, Yuriko
    Oka, Machiko
    Kawakami, Shigeru
    Hashida, Mitsuru
    [J]. JOURNAL OF CONTROLLED RELEASE, 2008, 125 (02) : 131 - 136
  • [7] Quantum dots - Nano-sized probes for the exploration of cellular and intracellular targeting
    Hild, W. A.
    Breunig, M.
    Goepferich, A.
    [J]. EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS, 2008, 68 (02) : 153 - 168
  • [8] Preparation of amine free silica-coated AgI nanoparticles with modified Stober method
    Kobayashi, Y.
    Shimizu, N.
    Misawa, K.
    Takeda, M.
    Ohuchi, N.
    Kasuya, A.
    Konno, M.
    [J]. SURFACE ENGINEERING, 2008, 24 (04) : 248 - 252
  • [9] Synthesis and properties of Co-Pt alloy silica core-shell particles
    Kobayashi, Y.
    Kakinuma, H.
    Nagao, D.
    Ando, Y.
    Miyazaki, T.
    Konno, M.
    [J]. JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 2008, 47 (01) : 16 - 22
  • [10] Silica-coating of metallic copper nanoparticles in aqueous solution
    Kobayashi, Y.
    Sakuraba, T.
    [J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2008, 317 (1-3) : 756 - 759