Strain sensing using a multiwalled carbon nanotube film

被引:62
作者
Vemuru, S. M.
Wahi, R. [2 ]
Nagarajaiah, S. [1 ,2 ]
Ajayan, P. M. [2 ]
机构
[1] Rice Univ, CEVE, Dept Civil & Environm Engn, Houston, TX 77005 USA
[2] Rice Univ, Dept Mech Engn & Mat Sci, Houston, TX 77251 USA
关键词
multiwalled carbon nanotube film; strain sensing; sensors; health monitoring; temperature; conductivity; voltage change;
D O I
10.1243/03093247JSA535
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The effectiveness of multiwalled carbon nanotubes (MWCNTs) as strain sensors is investigated. The key contribution of this paper is the study of real-time strain response at the macroscale of MWCNT film under tensile load. In addition, real-time voltage change as a function of temperature is examined. MWCNT films attached to a brass specimen by epoxy using vacuum bonding have been studied. The brass specimen is subjected to tensile loading, and voltage output from the MWCNT film is obtained using a four-point probe and a sensitive voltage measurement device. Experimental results show that there is a linear change in voltage across the film when subjected to tension, and the MWCNT film both fully recovers its unstressed state upon unloading and exhibits stable electromechanical properties. The effect of temperature on the voltage output of the nanotube film under no load condition is investigated. From the results obtained it is evident that MWCNT films exhibit a stable and predictable voltage response as a function of temperature. An increase in temperature leads to an increase in conductivity of the nanotube film. The study of MWCNT film for real-time strain sensing at the macroscale is very promising, and the effect of temperature on MWCNT film (with no load) can be reliably predicted.
引用
收藏
页码:555 / 562
页数:8
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