Revealing the Hidden Role of Radical Scavengers: Unraveling the Key to Tailoring the Formation of the hcp PdHx Phase in Graphene Liquid Cells

Jaeyoung Hong, Juyoung Kim, Jee Hwan Bae, Haneul Jin, Su Kyong Lee, Kyu Hyoung Lee, Young Su Lee, Dong Won Chun

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Radiation chemistry enables the synthesis of colloidal nanoparticles without chemical reducing agents, yielding metal nanoparticles via simple and direct processes. Aliphatic alcohols are widely used to promote the formation of nanoparticles in radiolytic synthesis by inhibiting the reoxidation of these metal nanoparticles by scavenging hydroxyl radicals. However, the role of the scavenger has been limited to simply accelerating the formation of the nanoparticles without altering their nature. Herein, the role of radical scavengers is investigated in determining the type of metal nanoparticles formed, with the scavenger concentration playing a crucial role. It is found that the addition of isopropyl alcohol controls the formation of hexagonal close-packed (hcp) palladium hydride (PdHx) nanoparticles that are previously synthesized for the first time via radiation chemistry by increasing the concentrations of hydrated electrons and hydrogen radicals. This discovery reveals a more active role for radical scavengers in radiolytic syntheses, and this strategy can be used for the cost-effective mass production of hcp PdHx nanoparticles.

Original languageEnglish
Article number2311293
JournalAdvanced Functional Materials
Volume34
Issue number23
DOIs
StatePublished - 6 Jun 2024

Keywords

  • graphene liquid cell
  • hcp palladium hydride
  • in situ TEM
  • radiation chemistry
  • radical scavenger
  • radiolysis product

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