Chapter 77. Passivation of CdTe Nanoparticles by Silane Coupling Agent Assisted Silica Encapsulation

  1. Hau-Tay Lin and
  2. Mrityunjay Singh
  1. M. Nayak,
  2. M. Ando and
  3. N. Murase

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294758.ch77

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4

How to Cite

Nayak, M., Ando, M. and Murase, N. (2002) Passivation of CdTe Nanoparticles by Silane Coupling Agent Assisted Silica Encapsulation, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294758.ch77

Author Information

  1. Photonics Division National Institute of Advanced Industrial Science and Technology (AIST), Kansai Midorigaoka, Ikeda City Osaka 563–8577 Japan

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375792

Online ISBN: 9780470294758

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Keywords:

  • cdte nanoparticles;
  • wet chemical method;
  • silica encapsulation;
  • silane coupling;
  • nanocomposite

Summary

Bright red emitting colloidal CdTe nanoparticles were prepared by a wet chemical method using thioglycolic acid as the stabilizing agent. Since these particles are susceptible to atmospheric attack, we encapsulated them in silica by previously functionalizing the nanoparticle surface using 3–aminopropyltrimethoxysilane to form nanocomposite. The nanocomposite, thus prepared, showed ca. 50% lower quantum efficiency than the colloidal particles. The luminescence is drastically enhanced by the irradiation of UV with a considerable blue shift. This is caused by the nanoparticle consumption due to photoinduced surface changes and subsequent photo-assisted surface passivation. The prepared nanocomposite is stable under ambient conditions.