Fabrication of Carbon Nanocoils Based Tactile Pressure Sensor
Date Issued
2008
Date
2008
Author(s)
Li, Cheng-Hung
Abstract
Carbon nanocoils have attracted a lot of attention due to their unique 3D helical spiral structure. However, presently the synthesis methods of carbon nanocoils have not been well established, resulting in limiting their applications. In this thesis, we demonstrate a promising carbon nanocoil application using carbon nanocoils as core elements to fabricate tactile pressure sensors with high sensitivity. The carbon nanocoil mats first were grown by Fe-Sn catalyst. Subsequently, we utilized the carbon nanocoil mats as a thin film structure and then used the PDMS ( polydimethyl siloxane ) to cover the top and bottom sides to form a sandwich structure. The performance of the fabricated carbon nanocoil tactile pressure sensors was examined by a load cell system. The sensitivity of the tactile pressure can achieve 0.99 %/KPa. Instead of pure carbon nanocoil thin films as sensing core elements, we also investigated the effect of the composition ratio of carbon nanocoils and carbon fibers on the performance of the tactile pressure sensors. It is found that the ratio of carbon fiber and carbon nanocoils in the device dramatically affected the sensing properties. In this thesis, the tactile pressure sensors were also preloaded by 1500 gw (210 KPa) for 24 hrs to observe whether the sensitivity and stability were enhanced. However, our results show that the preloading process would not be able to increase the sensitivity. The reason could be from the damage of the carbon nanocoil mat structure during the preloading process.
Subjects
carbon nanocoil
carbon fiber
tactile pressure sensor
sensitivity
preloading
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-97-R95522632-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):b894398f21754e65f57a51fb804cac96