材料科学
热敏电阻器
温度系数
碳纳米管
电阻和电导
纳米管
热传导
大气温度范围
电阻率和电导率
凝聚态物理
复合材料
纳米技术
热力学
电气工程
物理
工程类
作者
Antonio Di Bartolomeo,Maria Sarno,Filippo Giubileo,Claudia Altavilla,Laura Iemmo,S. Piano,F. Bobba,Maria Longobardi,Alessandro Scarfato,Diana Sannino,A. M. Cucolo,Paolo Ciambelli
摘要
We present the fabrication of thick and dense carbon nanotube networks in the form of freestanding films (CNTFs) and the study of their electric resistance as a function of the temperature, from 4 to 420 K. A nonmetallic behavior with a monotonic R(T) and a temperature coefficient of resistance around −7×10−4 K−1 is generally observed. A behavioral accordance of the CNTF conductance with the temperature measured by a solid-state thermistor (ZnNO, Si, or Pt) is demonstrated, suggesting the possibility of using CNTFs as temperature small-sized (freely scalable) sensors, besides being confirmed by a wide range of sensitivity, fast response, and good stability and durability. Concerning electric behavior, we also underline that a transition from nonmetal to metal slightly below 273 K has been rarely observed. A model involving regions of highly anisotropic metallic conduction separated by tunneling barrier regions can explain the nonmetallic to metallic crossover based on the competing mechanisms of the metallic resistance rise and the barrier resistance lowering.
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