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Area of Science:

  • Functional nanomaterials
  • Surface science
  • Nanotechnology

Background:

  • Core-satellite nanoclusters offer unique optoelectronic properties.
  • Existing synthesis methods are complex and lack surface ordering capabilities.

Purpose of the Study:

  • To develop a reproducible and simplified thin film process for fabricating ordered bimetallic raspberry nanoclusters.
  • To demonstrate the use of block copolymer (BCP) lithography for controlled nanocluster assembly.

Main Methods:

  • Utilized multilayer block copolymer (BCP) nanopatterns for templating.
  • Infiltrated BCP nanopatterns with alumina and gold species.
  • Employed microscopy and X-ray reflectivity for in-situ analysis.

Main Results:

  • Fabricated bimetallic raspberry nanoclusters with alumina cores (~36 nm) and gold satellites (~15 nm).
  • Achieved tunable nanodot periodicities (30-80 nm) using BCPs of varying molecular weights.
  • Confirmed excellent order and vertical orientation of nanoclusters over wafer-scale areas via grazing-incidence small-angle X-ray scattering.

Conclusions:

  • Demonstrated a robust strategy for designing hybrid nanoclusters using BCP infiltration.
  • The method allows for the use of various low-cost precursors for diverse nanocluster compositions.
  • The controlled nanocluster fabrication is promising for metasurface and optical sensor applications.