EPR signal of nanolayer in conducting polypyrrole (PPy) nanocomposites

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

doi:10.1016/S0379-6779(02)00846-9

EPR signal of nanolayer in conducting polypyrrole (PPy) nanocomposites

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

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 (ΔH_p-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 ΔH_p-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 language	English
Pages (from-to)	771-772
Number of pages	2
Journal	Synthetic Metals
Volume	135-136
DOIs	https://doi.org/10.1016/S0379-6779(02)00846-9
Publication status	Published - 2003 Apr 4

Keywords

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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10.1016/S0379-6779(02)00846-9

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title = "EPR signal of nanolayer in conducting polypyrrole (PPy) nanocomposites",

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.",

keywords = "EPR(ESR), Nanocomposite, Polypyrrole, Relaxation time",

author = "Kim, {B. H.} and Hong, {S. H.} and Kim, {J. W.} and Choi, {Hyoung J.} and J. Joo",

year = "2003",

month = apr,

day = "4",

doi = "10.1016/S0379-6779(02)00846-9",

language = "English",

volume = "135-136",

pages = "771--772",

journal = "Synthetic Metals",

issn = "0379-6779",

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TY - JOUR

T1 - EPR signal of nanolayer in conducting polypyrrole (PPy) nanocomposites

AU - Kim, B. H.

AU - Hong, S. H.

AU - Kim, J. W.

AU - Choi, Hyoung J.

AU - Joo, J.

PY - 2003/4/4

Y1 - 2003/4/4

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.

KW - EPR(ESR)

KW - Nanocomposite

KW - Polypyrrole

KW - Relaxation time

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VL - 135-136

SP - 771

EP - 772

JO - Synthetic Metals

JF - Synthetic Metals

ER -

EPR signal of nanolayer in conducting polypyrrole (PPy) nanocomposites

Abstract

Keywords

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