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Positive temperature coefficient thermistors based on carbon nanotube/polymer composites.

Zeng Y, Lu G, Wang H, Du J, Ying Z, Liu C - Sci Rep (2014)

Bottom Line: In order to explore availability of carbon nanotube (CNT)-based positive temperature coefficient (PTC) thermistors in practical application, we prepared carbon nanotube (CNT) filled high density polyethylene (HDPE) composites by using conventional melt-mixing methods, and investigated their PTC effects in details.Moreover, the CNT/HDPE thermistors exhibit rapid electrical response to applied voltages, comparable to commercial CB-based thermistors.In light of their high current-bearing capacity and quick response, the CNT-based thermistors have great potential to be used as high-performance thermistors in practical application, especially in some critical circumstances of high temperature, large applied currents, and high applied voltages.

View Article: PubMed Central - PubMed

Affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China.

ABSTRACT
In order to explore availability of carbon nanotube (CNT)-based positive temperature coefficient (PTC) thermistors in practical application, we prepared carbon nanotube (CNT) filled high density polyethylene (HDPE) composites by using conventional melt-mixing methods, and investigated their PTC effects in details. The CNT-based thermistors exhibit much larger hold current and higher hold voltage, increasing by 129% in comparison with the commercial carbon black (CB) filled HDPE thermistors. Such high current-bearing and voltage-bearing capacity for the CNT/HDPE thermistors is mainly attributed to high thermal conductivity and heat dissipation of entangled CNT networks. Moreover, the CNT/HDPE thermistors exhibit rapid electrical response to applied voltages, comparable to commercial CB-based thermistors. In light of their high current-bearing capacity and quick response, the CNT-based thermistors have great potential to be used as high-performance thermistors in practical application, especially in some critical circumstances of high temperature, large applied currents, and high applied voltages.

No MeSH data available.


Related in: MedlinePlus

Response rate of thermistors under applied voltages.Current-time curves of (a) CB/HDPE and (b) CNT/HDPE thermistors under different initial voltages. (c) Comparison of current decay between the CNT/HDPE and CB/HDPE thermistors with the same resistances under applied voltages at peak (Vpeak) reveals a quick response of current delay of the CNT/HDPE thermistors. (d) Equilibrium power of the CNT/HDPE and CB/HDPE thermistors.
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f4: Response rate of thermistors under applied voltages.Current-time curves of (a) CB/HDPE and (b) CNT/HDPE thermistors under different initial voltages. (c) Comparison of current decay between the CNT/HDPE and CB/HDPE thermistors with the same resistances under applied voltages at peak (Vpeak) reveals a quick response of current delay of the CNT/HDPE thermistors. (d) Equilibrium power of the CNT/HDPE and CB/HDPE thermistors.

Mentions: In order to evaluate response rate of the CNT/HDPE thermistors, we compared current-time curves of the CB/HDPE thermistors under applied voltages with that of the CNT/HDPE thermistors. We can clearly see from Figs. 4a-b that both thermistors exhibit strong dependence of current decay on initial applied voltages, which is closely associated with the generated Joule heat at different applied voltages. At low initial applied voltages, the generated Joule heat is so little that it can be released quickly, the thermistors exhibit typical ohmic characteristics (constant currents at certain voltages). With the increment of applied voltages, the generated Joule heat is too much to be released quickly, and the resultant elevation of temperature causes a typical PTC phenomenon, showing a sharp decay of current as a function of time. As shown in Figs. 4a-b, higher the initial applied voltages, more quickly the current decay, and more pronounced the PTC effect induced by applied voltages.


Positive temperature coefficient thermistors based on carbon nanotube/polymer composites.

Zeng Y, Lu G, Wang H, Du J, Ying Z, Liu C - Sci Rep (2014)

Response rate of thermistors under applied voltages.Current-time curves of (a) CB/HDPE and (b) CNT/HDPE thermistors under different initial voltages. (c) Comparison of current decay between the CNT/HDPE and CB/HDPE thermistors with the same resistances under applied voltages at peak (Vpeak) reveals a quick response of current delay of the CNT/HDPE thermistors. (d) Equilibrium power of the CNT/HDPE and CB/HDPE thermistors.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4202205&req=5

f4: Response rate of thermistors under applied voltages.Current-time curves of (a) CB/HDPE and (b) CNT/HDPE thermistors under different initial voltages. (c) Comparison of current decay between the CNT/HDPE and CB/HDPE thermistors with the same resistances under applied voltages at peak (Vpeak) reveals a quick response of current delay of the CNT/HDPE thermistors. (d) Equilibrium power of the CNT/HDPE and CB/HDPE thermistors.
Mentions: In order to evaluate response rate of the CNT/HDPE thermistors, we compared current-time curves of the CB/HDPE thermistors under applied voltages with that of the CNT/HDPE thermistors. We can clearly see from Figs. 4a-b that both thermistors exhibit strong dependence of current decay on initial applied voltages, which is closely associated with the generated Joule heat at different applied voltages. At low initial applied voltages, the generated Joule heat is so little that it can be released quickly, the thermistors exhibit typical ohmic characteristics (constant currents at certain voltages). With the increment of applied voltages, the generated Joule heat is too much to be released quickly, and the resultant elevation of temperature causes a typical PTC phenomenon, showing a sharp decay of current as a function of time. As shown in Figs. 4a-b, higher the initial applied voltages, more quickly the current decay, and more pronounced the PTC effect induced by applied voltages.

Bottom Line: In order to explore availability of carbon nanotube (CNT)-based positive temperature coefficient (PTC) thermistors in practical application, we prepared carbon nanotube (CNT) filled high density polyethylene (HDPE) composites by using conventional melt-mixing methods, and investigated their PTC effects in details.Moreover, the CNT/HDPE thermistors exhibit rapid electrical response to applied voltages, comparable to commercial CB-based thermistors.In light of their high current-bearing capacity and quick response, the CNT-based thermistors have great potential to be used as high-performance thermistors in practical application, especially in some critical circumstances of high temperature, large applied currents, and high applied voltages.

View Article: PubMed Central - PubMed

Affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China.

ABSTRACT
In order to explore availability of carbon nanotube (CNT)-based positive temperature coefficient (PTC) thermistors in practical application, we prepared carbon nanotube (CNT) filled high density polyethylene (HDPE) composites by using conventional melt-mixing methods, and investigated their PTC effects in details. The CNT-based thermistors exhibit much larger hold current and higher hold voltage, increasing by 129% in comparison with the commercial carbon black (CB) filled HDPE thermistors. Such high current-bearing and voltage-bearing capacity for the CNT/HDPE thermistors is mainly attributed to high thermal conductivity and heat dissipation of entangled CNT networks. Moreover, the CNT/HDPE thermistors exhibit rapid electrical response to applied voltages, comparable to commercial CB-based thermistors. In light of their high current-bearing capacity and quick response, the CNT-based thermistors have great potential to be used as high-performance thermistors in practical application, especially in some critical circumstances of high temperature, large applied currents, and high applied voltages.

No MeSH data available.


Related in: MedlinePlus