Fabrication of Room Temperature NO2 Gas Sensor based on Silver Nanoparticles-Decorated Carbon Nanotubes

Authors Waleed Kh. Mahmood, Asama N. Naje

Baghdad University, College of Science, Physics Department, Baghdad, Iraq

Issue Volume 10, Year 2018, Number 5
Dates Received 19 August 2018; revised manuscript received 20 October 2018; published online 29 October 2018
Citation Waleed Kh. Mahmood, Asama N. Naje, J. Nano- Electron. Phys. 10 No 5, 05020 (2018)
DOI https://doi.org/10.21272/jnep.10(5).05020
PACS Number(s) 07.07.Df, 61.46.Df, 78.67.Bf
Keywords Functionalized-SWCNTs, NO2 gas, Porous Silicon (3) , Sensitivity (11) , Silver NPs, Response time (3) , Fermi level (2) , Room temperature (3) , Chemical reduction.

Functionalized-single wall carbon nanotubes (F-SWCNTs) were easily and efficiently decorated with Ag Nanoparticles. The sensor device consisted of a film of sensitive material (F-SWCNTs) and (F-SWCNTs/Ag NPs) deposited by drop coating on n-type porous silicon substrate. The two sensors show high sensitivity to NO2 gas at different temperatures. Test results demonstrated that the (F-SWCNTs/Ag NPs) have a better performance than (F-SWCNTs). The F-SWCNTs gas sensor shows high sensitivity (36 %) at RT with response time 11 sec, whereas F-SWCNTs/Ag NPs gas sensor shows better sensitivity (150.5 %) at RT with response time 8 sec. The device shows a very reproducible sensor performance, with high repeatability, full recovery and efficient response. The improvement in the detection of some specific gases (NO2) using Ag-functionalized nanotubes is explained.

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