Possible application of carbon nanotube bundles for low temperature sensing

Abstract

We report on the R-T measurement of carbon nanotube bundles from room temperature down to 1 K. The resistance at a particular temperature depends on the diameter of the bundle. The larger the bundle diameter is, the lower the value of the resistance. The resistance increases with the decrease in temperature as in the case of carbon, carbon glass resistance thermometer, and carbon nanotubes reported in the literature. The rate of the variation of resistance depends on the resistance of the bundle at room temperature which can be explored for the low temperature thermometry. Overall, the resistance and the sensitivity of the bundle depend on the bundle diameter which can be monitored easily.

Carbon Nanotubes and Carbon Nanotube Structures Used for Temperature Measurement

“…Because of their good electrical response to the temperature variations, CNTs became a serious candidate as an emerging material to provide solutions for the future temperature sensors development. Both single and multiwall CNTs, having either metallic and semiconductor behavior, have been reported as temperature sensors [11,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55].…”

“…There are a few structure designs, fabricated in batch assembly processes [59], but most of CNT-based sensors are produced in a serial assembly process, resulting in a low number of products. Over time, several assembling methods have been developed, including: direct growth on the substrate by chemical vapor deposition (CVD) process [29,30,31,32,33,34,53,54,55];thin films obtained by gluing [37,38], printing [35,36], filtration over a membrane [51,52], spraying [49,50,60];drop-casting deposition from a solution followed by a dielectrophoresis (DEP) procedure [39,40,41,46,47,61,62]. …”

Electrical characteristics of multiwalled carbon nanotube arrays and influence of pressure

“…6(a). 15,16 The temperature distribution is almost uniform along the length of long metallic NTs as heat removal mainly takes place through the electrodes [ Fig. 6(a)].…”

“…It has been shown recently that the resistance of array decreases with increasing array diameter and temperature, 15,16 and NT arrays can be suitable for low resistance interconnects. Though the current carrying capacity of NTs is large, the resistance of NTs is typically in the range of k that may limit their applications.…”

High Sensitivity Carbon Nanotubes Flow-Rate Sensors and Their Performance Improvement by Coating

“…According to the principles (convective heat transfer), HWFS should have a large surface-to-volume (S/V) ratio, large temperature coefficient of resistance (TCR), and large slenderness ratio to improve their sensitivity. As a novel material, CNTs have exhibited excellent sensing properties [1], which have been utilized forgas sensor [2–4], temperature [5,6] and humidity sensors [7,8], pressure sensor [9,10], chemical sensor [11,12], biosensor [13,14], and flow sensor [15,16]. In relation to CNTs-HWFS, Victor et al .…”