Additive-controlled synthesis of monodisperse single crystalline gold nanoparticles : interplay of shape and surface plasmon resonance

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We introduce a three-step seed-mediated synthesis for single crystalline gold nanoparticles (Au NPs) stabilized by hexadecylpyridinium chloride (CPC) in variable sizes with an independently adjustable ratio of the cubic and octahedral facets. The effect of KBr and ascorbic acid (AA) on shape and growth kinetics is systematically investigated. The kinetic data were evaluated using the minimalistic Finke–Watzky autocatalytic two-step mechanism, which allows to estimate the rate constants of the “pseudoelementary” reactions. The proposed surface-mediated mechanism of reduction of gold ions and Au NP growth allows to explain the effect of gradual increase of bromide ion concentration on switching the Au NP morphology from cubic to octahedral. The plasmonic properties of single particles of different facetings and their assemblies are investigated.

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ISO 690KIRNER, Felizitas, Pavel POTAPOV, Johannes SCHULTZ, Jessica GEPPERT, Magdalena MÜLLER, Guillermo GONZALEZ-RUBIO, Sebastian STURM, Axel LUBK, Elena V. STURM, 2020. Additive-controlled synthesis of monodisperse single crystalline gold nanoparticles : interplay of shape and surface plasmon resonance. In: Journal of Materials Chemistry C. Royal Society of Chemistry (RSC). 2020, 8(31), pp. 10844-10851. ISSN 2050-7526. eISSN 2050-7534. Available under: doi: 10.1039/d0tc01748e
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@article{Kirner2020-08-13Addit-50828,
  year={2020},
  doi={10.1039/d0tc01748e},
  title={Additive-controlled synthesis of monodisperse single crystalline gold nanoparticles : interplay of shape and surface plasmon resonance},
  number={31},
  volume={8},
  issn={2050-7526},
  journal={Journal of Materials Chemistry C},
  pages={10844--10851},
  author={Kirner, Felizitas and Potapov, Pavel and Schultz, Johannes and Geppert, Jessica and Müller, Magdalena and Gonzalez-Rubio, Guillermo and Sturm, Sebastian and Lubk, Axel and Sturm, Elena V.}
}
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