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Iodide in CTAB Prevents Gold Nanorod Formation
Abstract
The gold nanocrystal seed-mediated approach using cetyltrimethylammonium bromide (CTAB) as a stabilizing surfactant is commonly used to make large quantities of monodisperse gold nanorods. This method, however, has been at times difficult to reproduce in different laboratories. We recently showed [Smith, D. K.; Korgel, B. A. Langmuir 2008, 24, 644-649] that a very low concentration impurity in CTAB obtained from some suppliers prevents nanorod growth but were not able to identify the impurity. Here, we report that the impurity is iodide. Inductively coupled plasma mass spectroscopy (ICP-MS) revealed that iodide concentrations vary in CTAB from different suppliers, from less than 2.75 ppm up to 840 ppm. When CTAB with iodide concentrations greater than 50 ppm is used, nanorods do not form and the product consists entirely of spherical nanocrystals. Iodide slows the reduction of Au(III) to Au0. Iodide adsorption on Au {111} surfaces inhibits nanorod growth.
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Cites
Chemistry and Properties of Nanocrystals of Different Shapes
Burda, C., Chen, X., Narayanan, R., & El-Sayed, M. A. (2005) · Chemical Reviews · doi:10.1021/cr030063a · Cited by 7,230
Shape control of CdSe nanocrystals
Peng, X., Manna, L., Yang, W., Wickham, J., Scher, E., Kadavanich, A., & Alivisatos, A. P. (2000) · Nature · doi:10.1038/35003535 · Cited by 4,487
Colloidal nanocrystal synthesis and the organic–inorganic interface
Yin, Y., & Alivisatos, A. P. (2005) · Nature · doi:10.1038/nature04165 · Cited by 3,273
Cited by
Copper Selenide Nanocrystals for Photothermal Therapy
Hessel, C. M., Pattani, V. P., Rasch, M., Panthani, M. G., Koo, B., Tunnell, J. W., & Korgel, B. A. (2011) · Nano Letters · doi:10.1021/nl201400z · Cited by 1,451
Self-citationState of the art in gold nanoparticle synthesis
Zhao, P., Li, N., & Astruc, D. (2013) · Coordination Chemistry Reviews · doi:10.1016/j.ccr.2012.09.002 · Cited by 964
The Many “Facets” of Halide Ions in the Chemistry of Colloidal Inorganic Nanocrystals
Ghosh, S., & Manna, L. (2018) · Chemical Reviews · doi:10.1021/acs.chemrev.8b00158 · Cited by 325
Metadata
- Authors
- Smith, D. K., Miller, N. R., & Korgel, B. A.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-05-04
- Volume
- 25
- Issue
- 16
- Pages
- 9518-9524
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2020061870
- Cited by
- 221
- References
- 3
- FWCI
- 9.08
- Type
- journal article
- Language
- en
- Open access
- closed
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