Abstract
A phenomenon was discovered that leads to the selective detection of abrupt increases in the temperature of conductive composite thin films consisting of conductive ceramic fillers and an insulating polymer matrix. Examining the heating rate dependence of the positive-temperature-coefficient-of-resistivity (PTCR) effect provided information about this intelligent phenomenon. The anomalous PTCR effect was observed above 0.3 °C min-1 for all the prepared films. However, the magnitude of the anomaly decreased when the heating rate decreased below 0.1 ° Cmin-1, and when the heating rate further decreased below 0.04 °C min-1, the anomalous resistivity-temperature relationship disappeared. The results suggest that these thin films can selectively detect abrupt increases in temperature, which could lead to an intelligent mechanism. Our results also suggest a PTCR mechanism, in which the expansion of crosslinked polymers in the thermodynamic nonequilibrium state essentially produces the anomaly.
| Original language | English |
|---|---|
| Pages (from-to) | 3742-3744 |
| Number of pages | 3 |
| Journal | Applied Physics Letters |
| Volume | 73 |
| Issue number | 25 |
| DOIs | |
| Publication status | Published - 1998 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
Cite this
Effect of heating rate on positive-temperature-coefficient-of-resistivity behavior of conductive composite thin films. / Hirano, S.; Kishimoto, Akira.
In: Applied Physics Letters, Vol. 73, No. 25, 1998, p. 3742-3744.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of heating rate on positive-temperature-coefficient-of-resistivity behavior of conductive composite thin films
AU - Hirano, S.
AU - Kishimoto, Akira
PY - 1998
Y1 - 1998
N2 - A phenomenon was discovered that leads to the selective detection of abrupt increases in the temperature of conductive composite thin films consisting of conductive ceramic fillers and an insulating polymer matrix. Examining the heating rate dependence of the positive-temperature-coefficient-of-resistivity (PTCR) effect provided information about this intelligent phenomenon. The anomalous PTCR effect was observed above 0.3 °C min-1 for all the prepared films. However, the magnitude of the anomaly decreased when the heating rate decreased below 0.1 ° Cmin-1, and when the heating rate further decreased below 0.04 °C min-1, the anomalous resistivity-temperature relationship disappeared. The results suggest that these thin films can selectively detect abrupt increases in temperature, which could lead to an intelligent mechanism. Our results also suggest a PTCR mechanism, in which the expansion of crosslinked polymers in the thermodynamic nonequilibrium state essentially produces the anomaly.
AB - A phenomenon was discovered that leads to the selective detection of abrupt increases in the temperature of conductive composite thin films consisting of conductive ceramic fillers and an insulating polymer matrix. Examining the heating rate dependence of the positive-temperature-coefficient-of-resistivity (PTCR) effect provided information about this intelligent phenomenon. The anomalous PTCR effect was observed above 0.3 °C min-1 for all the prepared films. However, the magnitude of the anomaly decreased when the heating rate decreased below 0.1 ° Cmin-1, and when the heating rate further decreased below 0.04 °C min-1, the anomalous resistivity-temperature relationship disappeared. The results suggest that these thin films can selectively detect abrupt increases in temperature, which could lead to an intelligent mechanism. Our results also suggest a PTCR mechanism, in which the expansion of crosslinked polymers in the thermodynamic nonequilibrium state essentially produces the anomaly.
UR - http://www.scopus.com/inward/record.url?scp=0000717168&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0000717168&partnerID=8YFLogxK
U2 - 10.1063/1.122880
DO - 10.1063/1.122880
M3 - Article
AN - SCOPUS:0000717168
VL - 73
SP - 3742
EP - 3744
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 25
ER -