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Growth Kinetic of a Rod-Shaped Metal Nanocrystal

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2009

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Henkel, Andreas
Schubert, Olaf
Sönnichsen, Carsten

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https://doi.org/10.1021/jp810979r
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Journal of Physical Chemistry C. American Chemical Society (ACS). 2009, 113(24), pp. 10390-10394. ISSN 1932-7447. eISSN 1932-7455. Available under: doi: 10.1021/jp810979r

Zusammenfassung

The crystallization dynamics in wet-chemical synthesis is the key parameter controlling nanoparticle morphology, which determines the frequency of the optical plasmon resonance in metal nanoparticles. Despite several in situ (dark-field microscopy) and ex situ (electron microscopy) studies of metal nanoparticle growth, the anisotropic growth kinetics are not well-understood mainly because the crystallization is a nonequilibrium process. Using simultaneous optical spectroscopy and time-resolved small-angle X-ray scattering at a synchrotron X-ray source, we directly monitor the anisotropic growth kinetics of gold and gold-copper nanorods and extract the growth parameters for both crystal directions (along the rod’s long and short axes) independently. We find a crossover from 1D to 3D growth modes at 8 and 12 min, respectively, where the nanorods attain their maximum aspect ratio. The growth model explains and predicts this crossover point without the need of a switch for the growth mode and allows for the fine-tuning of the particle shapes.

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ISO 690HENKEL, Andreas, Olaf SCHUBERT, Anton PLECH, Carsten SÖNNICHSEN, 2009. Growth Kinetic of a Rod-Shaped Metal Nanocrystal. In: Journal of Physical Chemistry C. American Chemical Society (ACS). 2009, 113(24), pp. 10390-10394. ISSN 1932-7447. eISSN 1932-7455. Available under: doi: 10.1021/jp810979r
BibTex
@article{Henkel2009Growt-58194,
  year={2009},
  doi={10.1021/jp810979r},
  title={Growth Kinetic of a Rod-Shaped Metal Nanocrystal},
  number={24},
  volume={113},
  issn={1932-7447},
  journal={Journal of Physical Chemistry C},
  pages={10390--10394},
  author={Henkel, Andreas and Schubert, Olaf and Plech, Anton and Sönnichsen, Carsten}
}
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    <dcterms:abstract xml:lang="eng">The crystallization dynamics in wet-chemical synthesis is the key parameter controlling nanoparticle morphology, which determines the frequency of the optical plasmon resonance in metal nanoparticles. Despite several in situ (dark-field microscopy) and ex situ (electron microscopy) studies of metal nanoparticle growth, the anisotropic growth kinetics are not well-understood mainly because the crystallization is a nonequilibrium process. Using simultaneous optical spectroscopy and time-resolved small-angle X-ray scattering at a synchrotron X-ray source, we directly monitor the anisotropic growth kinetics of gold and gold-copper nanorods and extract the growth parameters for both crystal directions (along the rod’s long and short axes) independently. We find a crossover from 1D to 3D growth modes at 8 and 12 min, respectively, where the nanorods attain their maximum aspect ratio. The growth model explains and predicts this crossover point without the need of a switch for the growth mode and allows for the fine-tuning of the particle shapes.</dcterms:abstract>
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