Specific NH&lt;sub&gt;3&lt;/sub&gt; Gas Sensor Worked at Room Temperature Based on MWCNTs-OH Network

Al-Husseini, Afnan H.; Al-Sammarraie, Abdulkareem Mohammed Ali; Saleh, Wasan R.

doi:10.4028/www.scientific.net/nhc.23.8

Cited by 13 publications

(7 citation statements)

References 22 publications

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“…It is shown that the networks have absorption in the range of 300 -1100 (nm). This result agrees with the absorption spectrum of MWCNTs reported by Al-Husseini, A. et al [33]. It exhibits short-wavelength absorption edged at approximately 312 (nm), and three absorption bands centred at 320 (nm), 350 (nm), and 375 (nm).…”

Section: Resultssupporting

confidence: 92%

Fabrication and Characterization of Functionalized Multi-Wall Carbon Nanotubes Flexible Network Modified by a Layer of Polypyrrole Conductive Polymer and Metallic Nanoparticles

Taradh

Saleh

2022

NHC

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Short Multi-Walled Carbon Nanotubes functionalized with OH group (MWCNTs-OH) were used to synthesize flexible MWCNTs networks. The MWCNTs suspension was synthesized using Benzoquinone (BQ) and N, N Dimethylformamide alcohol (DMF) in specific values and then deposited on filter paper by filtration from suspension (FFS) method. Polypyrrole (PPy) conductive polymer doped with metallic nanoparticles (MNPs) prepared using in-situ chemical polymerization method. To improve the properties of the MWCNTs networks, a coating layer of (PPy) conductive polymer, PPy:Ag nanoparticles, and PPy: Cu nanoparticles were applied to the network. The fabricated networks were characterized using an X-ray diffractometer (XRD), UV-Vis. spectrometer, and Atomic Force Microscope (AFM). XRD results revealed that the broadening for the (002) peak decreased after being coated with PPy and increased for the doped samples with MNPs, indicating on decrease in the crystalline size (MWCNTs/PPy) sample and increasing for doped ones with Ag and Cu MNPs. AFM images revealed that the surface roughness of the MWCNTs-OH network decreased after being coated with PPy, PPy: Ag, and PPy: Cu. With the help of AFM and XRD results, the CNTs contain 14 layers, while the inner and outer diameters were 18.2 nm and 27 nm receptivity. The UV-Vis. spectrum of MWCNTs showed several peaks, the highest in the 350 nm range. The coated of MWCNTs greatly affected the absorption spectrum, with many bands appearing between 300 to 450 nm and increasing the absorbance along the overall spectrum. For samples doped with Ag NPs and Cu NPs, a weak absorption peak of the plasmonic resonance frequency of the metallic nanoparticles. Analysis of Raman spectra shows that (ID/IG) ratios for all networks are less than one, which prove that the fabricated networks have few impurities and have good homogeneity. This work aimed to synthesize and characterize a flexible MWCNTs network and develop it by coated with a layer of conductive polymer and metallic nanoparticles for gas sensing application using quick and straightforward preparation methods.

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Section: Resultssupporting

confidence: 92%

Fabrication and Characterization of Functionalized Multi-Wall Carbon Nanotubes Flexible Network Modified by a Layer of Polypyrrole Conductive Polymer and Metallic Nanoparticles

Taradh

Saleh

2022

NHC

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“…When electron-acceptor molecules (e.g., NO2) or electron-donating molecules (e.g., NH3) interact with CNTs of p-type semiconducting, they will change the density of the main charge carriers (i.e., holes) in the nanotube, lead to changes the conductance of the CNTs. By comparing the results of MWCNTs-OH network of thickness 8μm with the results of [17] for a lower thickness of 4μm MWCNTs-OH network which prepared in the same conditions, conclude that they have the same behavior of resistance which was increased gradually when exposed to the NH3 gas and/or mixture of air and NH3. Higher thickness MWCNTs-OH sensor of 8μm have larger sensitivity values than that of lower thickness (4μm) for pure NH3 which were 1.5%, 3.3% and 6.13% for gas concentrations 14ppm, 27ppm, and 68ppm respectively.…”

Section: Sample Hotplatementioning

confidence: 90%

“…Higher thickness MWCNTs-OH sensor of 8μm have larger sensitivity values than that of lower thickness (4μm) for pure NH3 which were 1.5%, 3.3% and 6.13% for gas concentrations 14ppm, 27ppm, and 68ppm respectively. This is means that the sensitivity of the higher thickness MWCNTs-OH network (8μm) was increased to two times for 14 and 27 ppm and three times for 68ppm of NH3 concentration than that for network thickness of 4 μm of [17]. This gives an impression when increasing the film's thickness, the interaction between the gas molecules and the surface atoms had been easier.…”

Section: Sample Hotplatementioning

confidence: 94%

A Specific NH<sub>3</sub> Gas Sensor of a Thick MWCNTs-OH Network for Detection at Room Temperature

Al-Husseini

Saleh

Al-Sammarraie

2019

JNanoR

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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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“…The sensor responded to NH 3 and was unacted on the amount of ambient air. [ 134 ] Wang et al. reported a self‐powered NH 3 sensing system using PANI–MWCNTs composite thin film as sensing layers (Figure 6d).…”

Section: Materials For Gas Sensingmentioning

confidence: 99%

Recent Progress of Nanostructured Sensing Materials from 0D to 3D: Overview of Structure–Property‐Application Relationship for Gas Sensors

2021

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Along with the progress of nanoscience and nanotechnology, nanomaterials with attractive structural and functional properties have gained more attention than ever before, especially in the field of electronic sensors. In recent years, the gas sensing devices have made great achievement and also created wide application prospects, which leads to a new wave of research for designing advanced sensing materials. There is no doubt that the characteristics are highly governed by the sensitive layers. For this reason, important advances for the outstanding, novel sensing materials with different dimensional structures including 0D, 1D, 2D, and 3D are reported and summarized systematically. The sensing materials cover noble metals, metal oxide semiconductors, carbon nanomaterials, metal dichalcogenides, g‐C3N4, MXenes, and complex composites. Discussion is also extended to the relation between sensing performances and their structure, electronic properties, and surface chemistry. In addition, some gas sensing related applications are also highlighted, including environment monitoring, breath analysis, food quality and safety, and flexible wearable electronics, from current situation and the facing challenges to the future research perspectives.

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Specific NH<sub>3</sub> Gas Sensor Worked at Room Temperature Based on MWCNTs-OH Network

Cited by 13 publications

References 22 publications

Fabrication and Characterization of Functionalized Multi-Wall Carbon Nanotubes Flexible Network Modified by a Layer of Polypyrrole Conductive Polymer and Metallic Nanoparticles

Fabrication and Characterization of Functionalized Multi-Wall Carbon Nanotubes Flexible Network Modified by a Layer of Polypyrrole Conductive Polymer and Metallic Nanoparticles

A Specific NH<sub>3</sub> Gas Sensor of a Thick MWCNTs-OH Network for Detection at Room Temperature

Recent Progress of Nanostructured Sensing Materials from 0D to 3D: Overview of Structure–Property‐Application Relationship for Gas Sensors

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