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Aqueous Synthesis of Thiol-Capped CdTe Nanocrystals: State-of-the-Art
Abstract
We report on the state-of-the art synthesis and improved luminescence properties of thiol-capped CdTe nanocrystals (NCs) synthesized in water. The optimized pH (12) and molar ratio of thiol to Cd ions (1.3:1) increases the room-temperature photoluminescence quantum efficiency of as-synthesized CdTe NCs capped by thioglycolic acid (TGA) to values of 40−60%. By employing mercaptopropionic acid (MPA) as a stabilizer, we have synthesized large (up to 6.0 nm in diameter) NCs so that the spectral range of the NCs' emission currently available within this synthetic route extends from 500 to 800 nm. Sizing curve for thiol-capped CdTe NCs is provided. In contrast to CdTe NCs capped by TGA, MPA-capped CdTe NCs show up to 1 order of magnitude longer (up to 145 ns) emission decay times, which become monoexponential for larger particles. This phenomenon is explained by considering the energetics of the Te-related traps in respect to the valence-band position of CdTe NCs. The correlation between luminescence quantum efficiencies, luminescence lifetimes, and Stokes shifts of CdTe NC fractions is demonstrated, being in agreement with a model proposed previously that connects the emission properties of NCs with their surface quality determined by the Oswald ripening conditions during growth. imaging, and plasmonics.
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Cited by
Colloidal Nanocrystal-Based Gels and Aerogels: Material Aspects and Application Perspectives
Gaponik, N., Herrmann, A.-K., & Eychmüller, A. (2012) · The Journal of Physical Chemistry Letters · doi:10.1021/jz201357r · Cited by 173
Self-citationEmerging Hierarchical Aerogels: Self‐Assembly of Metal and Semiconductor Nanocrystals
Cai, B., Sayevich, V., Gaponik, N., & Eychmüller, A. (2018) · Advanced Materials · doi:10.1002/adma.201707518 · Cited by 136
Self-citationGrowth kinetics of CdTe colloidal nanocrystals
Ferreira, D. L., Silva, F. O., Viol, L. C. D. S., Licínio, P., Valadares, M., Cury, L. A., Schiavon, M. A., & Alves, J. L. A. (2009) · The Journal of Chemical Physics · doi:10.1063/1.3212964 · Cited by 16
Metadata
- Authors
- Rogach, A. L., Franzl, T., Klar, T. A., Feldmann, J., Gaponik, N., Lesnyak, V., Shavel, A., Eychmüller, A., Rakovich, Y. P., & Donegan, J. F.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2007-09-18
- Volume
- 111
- Issue
- 40
- Pages
- 14628-14637
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2062556705
- Cited by
- 741
- References
- 0
- FWCI
- 33.64
- Type
- journal article
- Language
- en
- Open access
- closed
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- Rogach, A. L., Franzl, T., Klar, T. A., Feldmann, J., Gaponik, N., Lesnyak, V., Shavel, A., Eychmüller, A., Rakovich, Y. P., & Donegan, J. F. (2007). Aqueous Synthesis of Thiol-Capped CdTe Nanocrystals: State-of-the-Art. The Journal of Physical Chemistry C. https://doi.org/10.1021/jp072463y
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