EPR signal of nanolayer in conducting polypyrrole (PPy) nanocomposites

B. H. Kim, S. H. Hong, J. W. Kim, Hyoung J. Choi, J. Joo

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We observed the very sharp EPR signals of the nanolayer of the intercalated PPy-DBSA in PPy-DBSA/Na+-MMT clay nanocomposite synthesized by inverse emulsion polymerization method. The g-value of EPR signal of the PPy-DBSA and the nanocomposite sample was 2.00432 (±0.00005) and 2.00263 (±00003), respectively. The line-widths (ΔHp-p) of the broad peak and the sharp peak of the nanocomposite sample were 21.4 G and 0.44 G respectively at room temperature. The small ΔHp-p of the nanolayer of the nanocomposite originates from the weak spin-orbit interaction. The spin-spin relaxation time of the sharp EPR signal was ∼1.3×10 -7sec, which is longer than that (∼5.5×10-9sec) of PPy-DBSA sample without clay. The density of states of the system was 0.085 states/ (eV ring) for the nanocomposite and ∼0.11 states /(eV ring) for the PPy-DBSA.

Original languageEnglish
Pages (from-to)771-772
Number of pages2
JournalSynthetic Metals
Publication statusPublished - 2003 Apr 4


  • EPR(ESR)
  • Nanocomposite
  • Polypyrrole
  • Relaxation time

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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