Microtrapping characteristics of single and multi-walled carbon nanotubes

“…This property is favorable for their use in the form of membranes [24], adsorbents [25] or gas sensors [26,27]. Gas and vapor adsorption as well as desorption usually proceeds at high rates and amounts [28]. The molecules are adsorbed on the carbon nanotube (CNT) surface by van der Waals attracting forces, which leads to remarkable changes in CNT electrical resistance.…”

Section: Effect Of Organic Vapors On Mwcnt Pure and Oxidized Networkmentioning

confidence: 99%

Electromechanical Sensors Based on Carbon Nanotube Networks and Their Polymer Composites

Slobodian

Riha

Olejník

2011

Lecture Notes in Electrical Engineering

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Abstract.A network of entangled multiwall carbon nanotubes and the composite consisting of filter-supported multiwall carbon nanotube network are conductors whose conductivity is sensitive to compressive stress both in the course of monotonic stress growth and when loading/unloading cycles are imposed. The testing has shown as much as 100% network conductivity increase at the maximum applied stress. The entangled carbon nanotube networks are prepared by vacuum filtration method and peeled off from the filter. The carbon nanotubes are used in pristine condition or chemically functionalized. The filtersupported entangled networks are prepared by the nanotube dispersion filtration through a non-woven flexible polystyrene filter. The nanotubes infiltrate partly into the filter surface pores and link the accumulated filtrate layer with the filtering mat. The filter-support increases nanotube network mechanical integrity, the composite tensile ultimate strength and affects favorably the composite electrical resistance. Other obvious effect of the supporting polymer is reduction of the resistance temperature dependence. Moreover, the conductivity of carbon nanotube networks manifests also organic vapor dependence. The dependence is reversible, reproducible, selective as well as influenced by nanotube oxidation.

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“…Multilayer adsorption may also occur when doi: 10.7243/2050-1323-3-2 organic chemicals are adsorbed on the surface of CNTs [21]. In addition, it has been shown that CNTs display faster desorption for a wide range of nonpolar compounds [22,23].…”

Section: Introductionmentioning

confidence: 99%

Growth and functionalization of carbon nanotubes on quartz filter for environmental applications

Amade

Hussain²,

Romero‐Ocaña³

et al. 2014

J Environ Eng Ecol Sci

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Background: Air pollution has become an important issue worldwide due to its adverse health effects. Among the different air contaminants, volatile organic compounds (VOCs) are liquids or solids with a high vapor pressure at room temperature that are extremely dangerous for human health. Removal of these compounds can be achieved using nanomaterials with tailored properties such as carbon nanotubes. Methods: Vertically-aligned multiwall carbon nanotubes (CNTs) were successfully grown on quartz filters by means of plasma enhanced chemical vapor deposition (PECVD). Furthermore, a plasma treatment was performed in order to modify the surface properties of the CNTs. The adsorption/desorption processes of three chlorinated compounds (trichloroethylene, 1,2-dichlorobenzene and chloroform) on the CNTs were studied using mass spectrometry measurements with a residual gas analyzer. Results: The adsorption capability of the CNTs increased after functionalization of their surface with a water plasma treatment. In addition, it was found that the presence of aromatic rings, water solubility and polarity of the VOCs play an important role on the adsorption/desorption kinetics at the CNTs surface. Conclusions: This study demonstrates the applicability of CNTs deposited on quartz filters for the removal or selective detection of volatile organic compounds (VOCs). The presence of aromatic rings in VOCs results in π-stacking interactions with a significant increase of their adsorption. On the other hand, it was found that CNTs surface interactions increase with water solubility and polarity of the VOC.

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Microtrapping characteristics of single and multi-walled carbon nanotubes

Cited by 61 publications

References 44 publications

A Flexible Multifunctional Sensor Based on Carbon Nanotube/Polyurethane Composite

A Flexible Multifunctional Sensor Based on Carbon Nanotube/Polyurethane Composite

Electromechanical Sensors Based on Carbon Nanotube Networks and Their Polymer Composites

Growth and functionalization of carbon nanotubes on quartz filter for environmental applications

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