Application of plasma modified multi-wall carbon nanotubes to ethanol vapor detection

Liu, Chun-Kuo; Wu, Jiann‐Ming; Shih, Han C.

doi:10.1016/j.snb.2010.08.026

Cited by 37 publications

(16 citation statements)

References 30 publications

(44 reference statements)

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“…Because it is applied to the surface of the nanotubes, it does not alter their bulk properties, and the nature and quantity of the functional species can be controlled by the choices of plasma gases and plasma parameters. CNTs have been plasma treated to purify them, open their tips and change their surface topography [31,32] . The purification of aligned CNTs removes amorphous carbon and other impurities within the CNTs, thus improving their overall performance while opening the tips and increasing their surface area.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and study of supercapacitor electrodes based on oxygen plasma functionalized carbon nanotube fibers

Adusei

Gbordzoe

Kanakaraj

et al. 2020

Journal of Energy Chemistry

106

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Section: Introductionmentioning

confidence: 99%

“…CNTs by nature are hydrophobic and inert, making them unfavorable for specific applications such as in microfluidic devices. Wettability of carbon nanotubes has been altered by changing their chemical composition or structure, and this can be achieved by oxygen plasma functionalization [32,[35][36][37][39][40][41] .…”

Section: Introductionmentioning

confidence: 99%

Fabrication and study of supercapacitor electrodes based on oxygen plasma functionalized carbon nanotube fibers

Adusei

Gbordzoe

Kanakaraj

et al. 2020

Journal of Energy Chemistry

106

View full text Add to dashboard Cite

“…Purified MWCNTs were treated with oxygen plasma or fluorine plasma and used for the detection of ethanol ( Figure 3) [52]. Changes in resistance as function of time were recorded for the sensors when exposed of 50-500 ppm of ethanol vapor in air.…”

Section: Surface Modified Carbon Nanotubesmentioning

confidence: 99%

Latest Advances in Modified/Functionalized Carbon Nanotube- Based Gas Sensors

Jesus¹,

Li²,

Cabrera³

2013

Syntheses and Applications of Carbon Nanotubes and Their Composites

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A gas sensor is a device that when exposed to gaseous species, is able to alter one or more of its physical properties, so that can be measured and quantified, directly or indirectly. These devices are used for applications in homeland security, medical diagnosis, environmental pollution, food processing, industrial emission, public security, agriculture, aerospace and aeronautics, among others. Desirable characteristics of a gas sensor are selectivity for different gases, sensitivity at low concentrations, fast response, room temperature operation some applications may require high temperature , low power consumption, low-cost, low maintenance and portability. Traditional techniques like gas chromatography GC , GC coupled to mass spectrometry GC-MS , Fourier transmission infrared spectroscopy FTIR and atomic emission detection AED provide high sensitivity, reliability and precision, but they are also bulky, time consuming, power consuming, operate at high temperature, and the high maintenance and requirement of trained technicians translate in high costs. In an effort to overcome those disadvantages, research in the area has been focused on the search for functional sensing materials.Carbon nanotubes CNTs have been have been focus of intense research as alternative sensing material because of their attractive characteristics like chemical, thermal and mechanical stability, high surface area, metallic and semi-conductive properties and functionalization capability [ ]. CNTs are graphene sheets rolled in a tubular fashion. Different types of CNTs can be synthesized single walled carbon nanotubes SWCNT , double wall carbon nanotubes DWCNTs and multi walled carbon nanotubes MWCNT .The publication of the first CNT-based sensor for NH and NO detection using an individual semiconducting SWCNT [ ] triggered the research activity in this area. Pristine CNTs have shown to be chemically inactive to gas molecules in general. However, their modifica-

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“…The adsorption properties of CNTs depend on the availability of adsorption sites on CNTs, the impurity of CNTs (e.g., contamination with metallic particles [ 6 ]) and defects on CNTs [ 7 ]. Furthermore, the properties of pristine CNTs may be substantially altered by various modifications of their surfaces e.g., by annealing [ 7 ], acids [ 8 ], KMnO 4 [ 9 ], fluorine [ 10 , 11 ], oxygen plasma [ 10 , 11 , 12 , 13 ], and amines [ 14 , 15 , 16 ]. Similarly, interactions between gas/vapors and polymer matrices of the respective sensors affect the resulting electrical resistance.…”

Section: Introductionmentioning

confidence: 99%

Microstrip Resonant Sensor for Differentiation of Components in Vapor Mixtures

Slobodian

Riha

Olejník

et al. 2021

Sensors

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A novel microstrip resonant vapor sensor made from a conductive multiwalled carbon nanotubes/ethylene-octene copolymer composite, of which its sensing properties were distinctively altered by vapor polarity, was developed for the detection of organic vapors. The alteration resulted from the modified composite electronic impedance due to the penetration of the vapors into the copolymer matrix, which subsequently swelled, increased the distances between the carbon nanotubes, and disrupted the conducting paths. This in turn modified the reflection coefficient frequency spectra. Since both the spectra and magnitudes of the reflection coefficients at the resonant frequencies of tested vapors were distinct, a combination of these parameters was used to identify the occurrence of a particular vapor or to differentiate components of vapor mixtures. Thus, one multivariate MWCNT/copolymer microstrip resonant sensor superseded an array of selective sensors.

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Application of plasma modified multi-wall carbon nanotubes to ethanol vapor detection

Cited by 37 publications

References 30 publications

Fabrication and study of supercapacitor electrodes based on oxygen plasma functionalized carbon nanotube fibers

Fabrication and study of supercapacitor electrodes based on oxygen plasma functionalized carbon nanotube fibers

Latest Advances in Modified/Functionalized Carbon Nanotube- Based Gas Sensors

Microstrip Resonant Sensor for Differentiation of Components in Vapor Mixtures

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