Abstract
Nanosensors enable the development of small and portable devices capable of monitoring several parameters simultaneously. As such, carbon nanotubes (CNTs), which offer unique properties, play an essential role in realizing nanosensors. Since CNTs are sensitive to many parameters, the sensor's performance can be affected by the interaction of CNTs with surroundings. Accordingly, the size of the sensor is an important factor in determining its overall performance. In this study, we report the size effect on the temperature sensitivity of sensors based on single wall carbon nanotubes (SWCNTs) deposited on a sapphire substrate. Solution-processed fabrication method is utilized to fabricate temperature sensors. In this method, dielectrophoretic force is employed to trap SWCNTs in between gold nanoelectrodes patterned on a sapphire substrate using the standard photolithography method [1]. The size of the sensor is controlled by monitoring the conductance of the sensor, which is related to the number of SWCNTs trapped between gold nanoelectrodes during the trapping process. The results show that the smaller sensor provides higher sensitivity.
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