A novel SnO2 gas sensor doped with carbon nanotubes operating at room temperature

Abstract: In this paper, Polyepichlorohyron(PECH)/multi-wall carbon nanotubes(MWCNTs) composite films and PECH/multi-wall carbon nanotubes twolayer film were deposited on interdigitated electrodes by airbrush technology to detect ethanol vapor of various concentrations at room temperature. Thickness and structure of the film were taken into account, so films of different thicknesses and with different structures were prepared respectively. The responses of the sensors to ethanol showed that composite film had a higher response thantwolayer film, and the thick composite film performed better than its counterpart when they were exposed to ethanol vapor.

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A Specific NH3 Gas Sensor of a Thick MWCNTs-OH Network for Detection at Room Temperature

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.56.98 ◽

2019 ◽

Vol 56 ◽

pp. 98-108 ◽

Cited By ~ 4

Author(s):

Afnan H. Al-Husseini ◽

Wasan R. Saleh ◽

Abdulkareem M.A. Al-Sammarraie

Keyword(s):

Carbon Nanotubes ◽

Gas Sensor ◽

Room Temperature ◽

Preparation Method ◽

Ambient Air ◽

Good Sensitivity ◽

Filtration Method ◽

Multi Walled Carbon Nanotubes ◽

Suspension Filtration ◽

Walled Carbon Nanotubes

NH3gas sensor was fabricated based on deposited of Functionalized Multi-Walled Carbon Nanotubes (MWCNTs-OH) suspension on filter paper substrates using suspension filtration method. The structural, morphological and optical properties of the MWCNTs film were characterized by XRD, AFM and FTIR techniques. XRD measurement confirmed that the structure of MWCNTs is not affected by the preparation method. The AFM images reflected highly ordered network in the form of a mat. The functional groups and types of bonding have appeared in the FTIR spectra. The fingerprint (C-C stretch) of MWCNTs appears in 1365 cm-1, and the backbone of CNTs observed at 1645 cm-1. A homemade sensing device was used to evaluate the fabrication network toward NH3gas at ppm levels as well as the response to sensitivity by changing the concentration. MWCNTs-OH network of 8mm thickness showed an increase in resistance upon exposure to the NH3gas. The sensor exhibits a good sensitivity for low concentration of NH3gas at room temperature. The sensitivities of the network were 2.5% at 14ppm, 5.3% at 27ppm and 17.6% at 68ppm. Further investigations showed that the network was specific sensitive to NH3gas in the environment and not affected by the amount of ambient air.

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Room temperature hydrogen gas sensor nanocomposite based on Pd-decorated multi-walled carbon nanotubes thin films

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2011.03.045 ◽

2011 ◽

Vol 157 (1) ◽

pp. 169-176 ◽

Cited By ~ 37

Author(s):

D. Zilli ◽

P.R. Bonelli ◽

A.L. Cukierman

Keyword(s):

Thin Films ◽

Carbon Nanotubes ◽

Gas Sensor ◽

Room Temperature ◽

Hydrogen Gas ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

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Specific NH3 Gas Sensor Worked at Room Temperature Based on MWCNTs-OH Network

Nano Hybrids and Composites ◽

10.4028/www.scientific.net/nhc.23.8 ◽

2018 ◽

Vol 23 ◽

pp. 8-16 ◽

Cited By ~ 3

Author(s):

Afnan H. Al-Husseini ◽

Abdulkareem M. A. Al-Sammarraie ◽

Wasan R. Saleh

Keyword(s):

Carbon Nanotubes ◽

Gas Sensor ◽

Room Temperature ◽

Ambient Air ◽

Close Packing ◽

Absorbance Spectrum ◽

Sem Images ◽

Vacuum Filtration ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Functionalized Multi-Walled Carbon Nanotubes (MWCNTs-OH) network with thickness 4μm was made by the vacuum filtration from suspension (FFS) method. The morphology, structure and optical properties of the MWCNTs film were characterized by SEM and UV-Vis. spectra techniques. The SEM images reflected highly ordered network in the form of ropes or bundles with close-packing which looks like spaghetti. The absorbance spectrum revealed that the network has a good absorbance in the UV-Vis. region. The gas sensor system was used to test the MWCNT-OH network to detect NH3gas at room temperature. The resistance of the sensor was increased when exposed to the NH3gas. The sensitivities of the network were 1.3% at 14ppm, 3.3% at 27ppm and 6.13% at 68ppm. The sensor is specifically sensitive to NH3gas and does not affect by the amount of ambient air.

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