Nanometer-sized polyradical particles: Organic magnetic dot array formed on a silicon microfabricated substrate

Manabu Tanaka, Shingo Imai, Takashi Tanii, Yoshiteru Numao, Naonobu Shimamoto, Iwao Ohdomari, Hiroyuki Nishide*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A magnetically active, purely organic dot array was formed by the selective deposition of polyradical nanoparticles on array-like-formed pits on a silicon substrate. The nanometer-sized polyradical particles, poly(4-methacryoyloxy-2,2, 6,6-tetramethylpiperidine-1-oxyl), were prepared by the emulsion polymerization of 4-methacryloyloxy-2,2,6,6-tetramethylpiperidine-1-acetoxyl followed by a deprotection reaction and oxidation in air. The size (diameter) and radical spin concentration of the polyradical nanoparticles were tunable between the polymerization and oxidation conditions. Electrochemical studies revealed the redox property of the polyradical nanoparticles. The magnetic response image of the polyradical nanoparticles was obtained by magnetic force microscopy, reflecting their radical spin concentrations. These results suggested a possible approach for the use of organic polyradical nanoparticles as organic magnetic dot arrays.

Original languageEnglish
Pages (from-to)521-530
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Issue number3
Publication statusPublished - 2007 Feb 1


  • Atomic force microscopy (afm)
  • Emulsion polymerization
  • Magnetic polymers
  • Nanoparticles

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry


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