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Direct coating of quantum dots with silica shell

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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 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.

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Acknowledgments

We express our thanks to Prof. T. Noguchi in College of Science of Ibaraki University, Japan for their help for TEM observation.

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Authors and Affiliations

  1. Department of Biomolecular Functional Engineering, College of Engineering, Ibaraki University, 4-12-1 Naka-narusawa-cho, Hitachi, Ibaraki, 316-8511, Japan

    Yoshio Kobayashi & Takuya Nozawa

  2. Division of Surgical Oncology, Graduate School of Medicine, Tohoku University, Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan

    Tomohiko Nakagawa, Kohsuke Gonda, Motohiro Takeda & Noriaki Ohuchi

  3. Center for Interdisciplinary Research, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai-shi, Miyagi, 980-8578, Japan

    Atsuo Kasuya

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  1. Yoshio Kobayashi
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  2. Takuya Nozawa
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  3. Tomohiko Nakagawa
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  4. Kohsuke Gonda
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  5. Motohiro Takeda
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  6. Noriaki Ohuchi
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  7. Atsuo Kasuya
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Correspondence to Yoshio Kobayashi.

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Kobayashi, Y., Nozawa, T., Nakagawa, T. et al. Direct coating of quantum dots with silica shell. J Sol-Gel Sci Technol 55, 79–85 (2010). https://doi.org/10.1007/s10971-010-2218-5

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  • DOI: https://doi.org/10.1007/s10971-010-2218-5

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