Block Copolymer Enabled Synthesis and Assembly of Chiral Metal Oxide Nanoparticle

Minju Kim, Jiweon Kim, Hyun Jeong Lee, Hyeohn Kim, Ki Tae Nam, Dong Ha Kim

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Chiral metal oxide nanostructures have received tremendous attention in nanotechnological applications owing to their intriguing chiroptical and magnetic properties. Current synthetic methods mostly rely on the use of amino acids or peptides as chiral inducers. Here, we report a general approach to fabricate chiral metal oxide nanostructures with tunable magneto-chiral effects, using block copolymer (BCP) inverse micelle and R/S-mandelic acid (MA). Diverse chiral metal oxide nanostructures are prepared by the selective incorporation of precursors within micellar cores followed by the oxidation process, exhibiting intense chiroptical properties with a g-factor up to 7.0 × 10-3 in the visible-NIR range for the Cr2O3 nanoparticle multilayer. The BCP inverse micelle is found to inhibit the racemization of MA, allowing MA to act as a chiral dopant that imparts chirality to nanostructures via hierarchical chirality transfer. Notably, for paramagnetic nanostructures, magneto-chiroptical modulation is realized by regulating the direction of the external magnetic field. This BCP-driven approach can be extended to the mass production of chiral nanostructures with tunable architectures and optical activities, which may provide insights into the development of chiroptical functional materials.

Original languageEnglish
Pages (from-to)7611-7623
Number of pages13
JournalACS Nano
Volume17
Issue number8
DOIs
StatePublished - 25 Apr 2023

Bibliographical note

Funding Information:
The work was supported by National Research Foundation of Korea (NRF) Grant funded by the Korean Government (2020R 1A 2C 3003958), the Basic Science Research Program (Priority Research Institute) funded by the Ministry of Education (2021R1A6A1A10039823), by the Korea Basic Science Institute (National Research Facilities and Equipment Center) grant funded by the Ministry of Education (2020R 1A 6C 101B194), by the Creative Materials Discovery Program through the NRF funded by the Ministry of Science and ICT (2018M 3D 1A 1058536), and by the Ewha Womans University Research Grant of 2022.

Publisher Copyright:
© 2023 American Chemical Society.

Keywords

  • block copolymer
  • chirality
  • co-assembly
  • magneto-chiroptical property
  • metal oxide nanostructure

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