Synthesis of IrO(2)decorated core-shell PS@PPyNH(2)microspheres for bio-interface application

Tsung-Lin Hsieh, Pei-Sung Hung, Chuan-Jyun Wang, Kuang-Chih Tso, Han-Yi Wang, Chien-Tai Cheng, Yu-Che Lin, Ren-Jei Chung, Kung-Hwa Wei, Pu-Wei Wu*, Po-Chun Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, an effective approach is demonstrated for the fabrication of IrO2-decorated polystyrene@functionalized polypyrrole (core@shell; PS@PPyNH2) microspheres. The synthesis begins with the preparation of monodispersive PS microspheres with a diameter of 490 nm, by a process of emulsifier-free emulsion polymerization, followed by a copolymerization process involving pyrrole and PyNH(2)monomers in a PS microsphere aqueous suspension, to produce uniform PS@PPyNH(2)microspheres with a diameter of 536 nm. The loading of 2 nm IrO(2)nanoparticles onto the PS@PPyNH(2)microspheres can be easily adjusted by tuning the pH value of the IrO(2)colloidal solution and the PS@PPyNH(2)suspension. At pH 4, we successfully obtain IrO2-decorated PS@PPyNH(2)microspheres via electrostatic attraction and hydrogen bonding simultaneously between the negatively-charged IrO(2)nanoparticles and the positively-charged PS@PPyNH(2)microspheres. These IrO2-decorated PS@PPyNH(2)microspheres exhibit a characteristic cyclic voltammetric profile, similar to that of an IrO(2)thin film. The charge storage capacity is 5.19 mA cm(-2), a value almost five times greater than that of PS@PPyNH(2)microspheres. In addition, these IrO2-decorated PS@PPyNH(2)microspheres exhibit excellent cell viability and biocompatibility.

Original languageEnglish
Article number375605
Pages (from-to)1-12
Number of pages12
JournalNanotechnology
Volume31
Issue number37
DOIs
StatePublished - 11 Sep 2020

Keywords

  • core-shell
  • polystyrene
  • polypyrrole
  • IrO2
  • bio-stimulating electrode
  • IRIDIUM OXIDE-FILMS
  • REACTIVE POLYPYRROLE
  • IN-VITRO
  • NANOPARTICLES
  • IRO2
  • IMMOBILIZATION
  • FABRICATION
  • COMPOSITE
  • LATEX
  • XPS

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