EPR signal of nanolayer in conducting polypyrrole (PPy) nanocomposites

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

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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
Volume135-136
DOIs
Publication statusPublished - 2003 Apr 4

Fingerprint

polypyrroles
Polypyrroles
Paramagnetic resonance
Nanocomposites
nanocomposites
conduction
clays
Clay
Emulsion polymerization
rings
spin-orbit interactions
Linewidth
Relaxation time
emulsions
Orbits
polymerization
relaxation time
polypyrrole
dextran-bound sulfonamide
room temperature

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Polymers and Plastics

Cite this

EPR signal of nanolayer in conducting polypyrrole (PPy) nanocomposites. / Kim, B. H.; Hong, S. H.; Kim, J. W.; Choi, Hyoung J.; Joo, Jinsoo.

In: Synthetic Metals, Vol. 135-136, 04.04.2003, p. 771-772.

Research output: Contribution to journalArticle

Kim, B. H. ; Hong, S. H. ; Kim, J. W. ; Choi, Hyoung J. ; Joo, Jinsoo. / EPR signal of nanolayer in conducting polypyrrole (PPy) nanocomposites. In: Synthetic Metals. 2003 ; Vol. 135-136. pp. 771-772.
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AU - Hong, S. H.

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AU - Choi, Hyoung J.

AU - Joo, Jinsoo

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N2 - 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.

AB - 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.

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