Controlling Oriented Attachment of Gold Nanoparticles by Size and Shape

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The Journal of Physical Chemistry C. American Chemical Society (ACS). 2021, 125(37), pp. 20343-20350. ISSN 1932-7447. eISSN 1932-7455. Available under: doi: 10.1021/acs.jpcc.1c05937
Zusammenfassung

The concept of nanoparticles (NPs) as building blocks offers new possibilities to produce complex and tailored structures from the nano- to the mesoscale. In order to control a “polymerization” of particles, knowledge of the mechanism and kinetics of the reaction are necessary. We show that controlled assembly of cetylpyridinium chloride-stabilized gold NPs utilizing induced dipole–dipole interactions can lead to the formation of defined one-dimensional structures in solution. Three different shaped NPs (cubes, octahedra, and truncated cuboctahedra) were investigated individually. The assembly process is analogous to a step growth polymerization and is quantitatively describable with kinetics of a polyesterification. In situ kinetic studies reveal that there is an ideal particle size and shape for the induced dipole-driven assembly. Even small changes in size have remarkable effects on the assembly behavior. We further demonstrate that the transition from oriented assembly to oriented attachment requires a critical particle size (critical interface area) resulting from a size-dependent energy barrier for the crystallographic fusion. A combination of ideal size, shape, and degree of destabilization enables controlled oriented attachment of gold NPs in solution to chainlike structures under ambient conditions.

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ISO 690SCHUPP, David Joshua, Jonathan ANGST, Eva A. SCHAEFER, Stefan SCHUPP, Helmut CÖLFEN, 2021. Controlling Oriented Attachment of Gold Nanoparticles by Size and Shape. In: The Journal of Physical Chemistry C. American Chemical Society (ACS). 2021, 125(37), pp. 20343-20350. ISSN 1932-7447. eISSN 1932-7455. Available under: doi: 10.1021/acs.jpcc.1c05937
BibTex
@article{Schupp2021Contr-55244,
  year={2021},
  doi={10.1021/acs.jpcc.1c05937},
  title={Controlling Oriented Attachment of Gold Nanoparticles by Size and Shape},
  number={37},
  volume={125},
  issn={1932-7447},
  journal={The Journal of Physical Chemistry C},
  pages={20343--20350},
  author={Schupp, David Joshua and Angst, Jonathan and Schaefer, Eva A. and Schupp, Stefan and Cölfen, Helmut}
}
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