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- Title
Functionalized Carbon Nanotubes on Porous Silicon for Sensing Application.
- Authors
Abbas, Sally K.; Naje, Asama N.
- Abstract
The evolution of carbon nanotube (CNTs) based gas sensors has attracted great interest among researchers in the last decade because of their selectivity for various gaseous media, fast response, high sensitivity and room temperature operation. Functionalized single-walled carbon nanotubes (F-SWCNTs) and functionalized multi-walled carbon nanotubes (F-MWCNTs) have been utilized to manufacture nitrogen dioxide gas sensor. CNTs films have been deposited on (n-type) porous silicon substrate by the drop casting technique. A porous silicon layer (PS) was prepared using the photo-electrochemical etching. The applied current density is 20 mA/cm2 with green laser radiation, and the typical photo-electrochemical etching time was about 15 min. When the F-SWCNTs and F-MWCNTs samples were exposed to NO2 gas at different operating temperatures, the sensitivity response results show that the F-SWCNTs have better performance than the F-MWCNTs. At 200 °C the F-SWCNTs/PS sensitivity reaches 61%, the response time and the recovery time were about 10 s and 214 s, respectively; whereas for the F-MWCNTs/PS the sensitivity reaches 57 % at 100 °C, the response time and the recovery time were about 20 s and 647 s, respectively. At the same time, the F-MWCNTs have an operating temperature (100 °C) less than that of the F-SWCNTs (200 °C).
- Subjects
POROUS silicon; CARBON nanotubes; SINGLE walled carbon nanotubes; MULTIWALLED carbon nanotubes; PHOTOELECTROCHEMICAL etching; LASER beams; REACTION time; N-type semiconductors
- Publication
Journal of Nano- & Electronic Physics, 2019, Vol 11, Issue 5, p1
- ISSN
2077-6772
- Publication type
Article
- DOI
10.21272/jnep.11(5).05015