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Vapor-Phase Heteroatom Incorporation into Semiconductive Molecular-Scale Magic-Size Clusters.

Kihoon Kim1, Taylor Harville2, Nestor J Zaluzec3

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Postmodification of magic-size metal chalcogenide clusters with cadmium (Cd) enhances their optical properties. This process involves cadmium replacing indium, forming new nanoscale aggregates with tunable characteristics.

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atomic layer depositionclusterdopingsequential infiltration synthesissurface chemistryvapor-phase infiltration

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Chemistry

Background:

  • Magic-size metal chalcogenide clusters possess unique properties due to their defined structures.
  • Postmodification offers a route to tune cluster properties by introducing new elements.

Purpose of the Study:

  • To investigate the postmodification of indium sulfide (In6S6) clusters using volatile metal organic precursors.
  • To explore the incorporation of a second metal into magic-size clusters and its effect on properties.

Main Methods:

  • Synthesis of In6S6 clusters in polymer thin films.
  • Postmodification via exposure to dimethylcadmium (a metal organic precursor).
  • Characterization of cluster transformation and optical property changes.

Main Results:

  • Exposure to dimethylcadmium led to cadmium (Cd2+) incorporation into In6S6 clusters.
  • Cd incorporation extended the optical absorbance into the visible spectrum.
  • Ligand loss during postmodification resulted in cluster sintering and formation of zinc blende-type nanoscale aggregates.

Conclusions:

  • Postmodification of magic-size clusters is feasible using atomic layer deposition precursors.
  • Cd incorporation alters cluster properties and can lead to new nanostructures.
  • Computational analysis provides insights into the thermodynamics of heteroatom incorporation.