Analytical Calculation of Sensing Parameters on Carbon Nanotube Based Gas Sensors

Sensors

Elnaz Akbari¹  Rubiyah Yousof¹  Hediyeh Karimi¹  Mohammad Taghi. Ahmadi²  Aria Enzevaee³  Zolkafle Buntat⁴  Mohd Hafizi Ahmad⁴  Syed Muhammad Zafar Iqbal⁴  Muhammad Abu Bakar Sidik⁴ 

[1] Centre for Artificial Intelligence and Robotics (CAIRO), Universiti Teknologi Malaysia,Kuala Lumpur 54100, Malaysia;Computational Nanoelectronic Research Group Faculty of Electrical Engineering,Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia;Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia;Institute of High Voltage & High Current, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia;

关键词: carbon nanotubes (CNTs);    NH3 gas sensor;    I–V characteristic;    field effect transistor (FET);   

DOI  :  10.3390/s140305502

来源: DOAJ

【 摘 要 】

Carbon Nanotubes (CNTs) are generally nano-scale tubes comprising a network of carbon atoms in a cylindrical setting that compared with silicon counterparts present outstanding characteristics such as high mechanical strength, high sensing capability and large surface-to-volume ratio. These characteristics, in addition to the fact that CNTs experience changes in their electrical conductance when exposed to different gases, make them appropriate candidates for use in sensing/measuring applications such as gas detection devices. In this research, a model for a Field Effect Transistor (FET)-based structure has been developed as a platform for a gas detection sensor in which the CNT conductance change resulting from the chemical reaction between NH3 and CNT has been employed to model the sensing mechanism with proposed sensing parameters. The research implements the same FET-based structure as in the work of Peng et al. on nanotube-based NH3 gas detection. With respect to this conductance change, the I–V characteristic of the CNT is investigated. Finally, a comparative study shows satisfactory agreement between the proposed model and the experimental data from the mentioned research.

【 授权许可】

Unknown