Directed Assembly of Quantum Dots Using Brush Block Copolymers for Well-Ordered Nonlinear Optical Nanocomposites

Dong Po Song, Shiva Shahin, Wanting Xie, Soroush Mehravar, Xiaohui Liu, Cheng Li, Robert A Norwood, Jae Hwang Lee, James J. Watkins

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

We report the directed assembly of quantum dots (QDs) within well-ordered photonic nanocomposites using a family of (polynorbornene-graft-poly(styrene))-block-(polynorbornene-graft-poly(ethylene oxide)) (PS-b-PEO) brush block copolymers (BBCPs). Cadmium selenide (CdSe) nanoparticles (NPs) modified with 11-mercaptoundecylhydroquinone are selectively incorporated within the PEO domains of the self-assembled BBCPs via strong hydrogen-bonding interactions between the ligands on QDs and PEO brushes of the BBCPs. Well-ordered QD arrays were readily created within a periodic lamellar polymer matrix, or one-dimensional photonic crystal, with a widely tunable lattice spacing ranging from 46.2 to up to 145 nm. The loading concentration of the QDs can be up to 30 wt % (15 vol %) while maintaining a well-ordered lamellar morphology, providing an optical gain material platform for the systematic investigation of optical properties. Strong photoluminescence and third harmonic generation from the well-ordered QD arrays were observed via multiphoton excitation using femtosecond (fs) laser light at several optical wavelengths from 700 to 1550 nm.

Original languageEnglish (US)
Pages (from-to)5068-5075
Number of pages8
JournalMacromolecules
Volume49
Issue number14
DOIs
StatePublished - Jul 26 2016

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry

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    Song, D. P., Shahin, S., Xie, W., Mehravar, S., Liu, X., Li, C., Norwood, R. A., Lee, J. H., & Watkins, J. J. (2016). Directed Assembly of Quantum Dots Using Brush Block Copolymers for Well-Ordered Nonlinear Optical Nanocomposites. Macromolecules, 49(14), 5068-5075. https://doi.org/10.1021/acs.macromol.6b00926