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Ordered CdSe nanoparticles within self-assembled block copolymer domains on surfaces.

Shan Zou1, Rui Hong, Todd Emrick

  • 1Department of Chemistry and Institute for Optical Sciences, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 25, 2007
PubMed
Summary

Self-assembling cadmium selenide (CdSe) nanoparticles into ordered patterns on silicon substrates was achieved using diblock copolymer films. This method created high-density, hierarchical nanostructures for potential electronic applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Block copolymers enable the creation of ordered nanostructures through microphase separation.
  • Surface modification of nanoparticles is crucial for controlling their assembly and integration into polymer matrices.

Purpose of the Study:

  • To fabricate hierarchical, high-density, ordered patterns of cadmium selenide (CdSe) nanoparticles on silicon (Si) substrates.
  • To investigate the controlled self-assembly of surface-modified CdSe nanoparticles within diblock copolymer films.

Main Methods:

  • Utilized diblock copolymer films (polystyrene-b-poly(2-vinylpyridine), PS-b-P2VP) approximately 20-nm thick on Si substrates.
  • Employed surface-modified CdSe nanoparticles (coated with trioctylphosphine oxide (TOPO) and polyethylene glycol (PEG)).
  • Characterized nanoparticle distribution and film morphology using scanning electron microscopy (SEM) and contact angle measurements.

Main Results:

  • Achieved hierarchical, high-density, ordered patterns of CdSe nanoparticles via self-assembly.
  • Demonstrated selective incorporation of TOPO-coated CdSe into PS domains and PEG-coated CdSe into P2VP domains.
  • Confirmed nearly close-packed nanoparticle arrangements using SEM and identified partial placement of TOPO-CdSe at the air/copolymer interface via contact angle analysis.

Conclusions:

  • Controlled self-assembly of surface-modified CdSe nanoparticles within microphase-separated diblock copolymer domains is feasible.
  • The choice of nanoparticle surface modification dictates their preferential location within the copolymer nanodomains.
  • This technique offers a pathway for fabricating ordered, high-density nanoparticle arrays on substrates for advanced material applications.