Sensing Element Made of Multi-Wall Carbon Nanotube Network for Organic Vapor Detection

2011 ◽  
Vol 495 ◽  
pp. 9-12
Author(s):  
Robert Olejnik ◽  
Petr Slobodian ◽  
Petr Saha
Keyword(s):  
Carbon Nanotube ◽  
Organic Solvent ◽  
Aqueous Suspension ◽  
Multiwall Carbon Nanotubes ◽  
Sensing Element ◽  
Vapor Detection ◽  
Filtration Method ◽  
Organic Vapor ◽  
Multi Wall Carbon Nanotube ◽  
Solvent Vapors

Multiwall carbon nanotubes (MWCNT) network “Buckypaper” was made by the vacuum filtration method of MWCNT aqueous suspension. The sensitivity of multi-wall carbon nanotube (MWCNT) networks of randomly entangled pure nanotubes to various organic solvent vapors (tetrahydrofuran, methyl ethyl ketone, and ethanol) has been investigated by resistance measurements. The results demonstrate that the network electrical resistance increases when exposed to organic solvent vapors, and a reversible reaction is observed when the sample is removed from the vapors. The investigated MWCNT networks could be potentially used as sensing elements for sensitive and selective organic vapor detection.

Sensing Element Made of Multi-Wall Carbon Nanotube Network for Organic Vapor Detection

2011 ◽  
Vol 495 ◽  
pp. 355-358 ◽  
Author(s):  
Robert Olejnik ◽  
Petr Slobodian ◽  
Petr Saha
Keyword(s):  
Carbon Nanotube ◽  
Organic Solvent ◽  
Aqueous Suspension ◽  
Multiwall Carbon Nanotubes ◽  
Sensing Element ◽  
Vapor Detection ◽  
Filtration Method ◽  
Organic Vapor ◽  
Multi Wall Carbon Nanotube ◽  
Solvent Vapors

Multiwall carbon nanotubes (MWCNT) network “Buckypaper” was made by the vacuum filtration method of MWCNT aqueous suspension. The sensitivity of multi-wall carbon nanotube (MWCNT) networks of randomly entangled pure nanotubes to various organic solvent vapors (tetrahydrofuran, methyl ethyl ketone, and ethanol) has been investigated by resistance measurements. The results demonstrate that the network electrical resistance increases when exposed to organic solvent vapors, and a reversible reaction is observed when the sample is removed from the vapors. The investigated MWCNT networks could be potentially used as sensing elements for sensitive and selective organic vapor detection.

The Multifunctional Composite on the Base of Carbon Nanotubes Network and its Use as a Passive Antenna and Gas Sensing Element

2014 ◽  
Vol 605 ◽  
pp. 322-325
Author(s):  
Robert Olejnik ◽  
Jiri Matyas ◽  
Petr Slobodian ◽  
Karel Vlcek
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensing ◽  
Aqueous Suspension ◽  
Multiwall Carbon Nanotubes ◽  
Sensing Element ◽  
Vapor Detection ◽  
Filtration Method ◽  
Wide Range ◽  
Passive Antenna ◽  
Nonpolar Organic

Carbon nanotubes in the form of entangled network can be used as a multifunctional composite material for a wide range of using. A new and perspective usage is a passive antenna and gas sensing element. The antenna works well at 1.284 GHz. The local reflection minimum is 11.48 dB. The reflection coefficient r=0.2667. The transmission power in this frequency is 93%. Multiwall carbon nanotubes (MWCNT) network Buckypaper was made by the vacuum filtration method of MWCNT aqueous suspension. The sensitivity of multi-wall carbon nanotube (MWCNT) networks of randomly entangled pure and HNO3 oxidized nanotubes to polar and nonpolar organic vapors (ethanol, heptane), has been investigated by resistance measurements. The results demonstrate that the network electrical resistance increases when exposed to organic solvent vapors, and a reversible reaction is observed when the sample is removed from the vapors. The investigated MWCNT networks could be potentially used as sensing elements for sensitive and selective organic vapor detection.

Improved Selectivity of Oxidized Multiwall Carbon Nanotube Network for Detection of Ethanol Vapor

2011 ◽  
Vol 495 ◽  
pp. 83-86 ◽  
Author(s):  
Daniel Matejik ◽  
Robert Olejnik ◽  
Petr Slobodian ◽  
Petr Saha
Keyword(s):  
Aqueous Suspension ◽  
Multiwall Carbon Nanotubes ◽  
Ethanol Vapor ◽  
Solubility Parameters ◽  
Multiwall Carbon Nanotube ◽  
Hansen Solubility Parameters ◽  
Vapor Detection ◽  
Filtration Method ◽  
Carbon Nanotube Network ◽  
Multiwall Carbon

Two kinds of Multiwall carbon nanotubes (MWCNT) networks “Buckypaper” were made by the vacuum filtration method of MWCNT aqueous suspension. The first one was prepared from pure CNT and the second from its oxidized form by acidic KMnO4 as oxidizing agent. The CNT oxidation increase content of oxygen bonded to the surface of CNT decreasing their hydrophobic character. The sensitivity of MWCNT networks to two kind of organic solvent vapors (ethanol and hepane) has been investigated by resistance measurements. The solvents had different polarities given by Hansen solubility parameters and nearly the same volume fractions of saturated vapors at the condition of experiment. CNT oxidation significantly increases the sensitivity of CNT resistive sensor to vapors of ethanol and decrease response to heptane vapors. The present paper demonstrates the effective way how to add proper selectivity for organic vapor detection.

Multi-wall carbon nanotube networks as potential resistive gas sensors for organic vapor detection

Carbon ◽  
2011 ◽  
Vol 49 (7) ◽  
pp. 2499-2507 ◽  
Author(s):  
P. Slobodian ◽  
P. Riha ◽  
A. Lengalova ◽  
P. Svoboda ◽  
P. Saha
Keyword(s):  
Carbon Nanotube ◽  
Gas Sensors ◽  
Vapor Detection ◽  
Organic Vapor ◽  
Resistive Gas Sensors ◽  
Carbon Nanotube Networks ◽  
Multi Wall Carbon Nanotube

Carbon Nanotube Sensors for Gas and Organic Vapor Detection

Nano Letters ◽  
2003 ◽  
Vol 3 (7) ◽  
pp. 929-933 ◽  
Author(s):  
Jing Li ◽  
Yijiang Lu ◽  
Qi Ye ◽  
Martin Cinke ◽  
Jie Han ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Vapor Detection ◽  
Organic Vapor

scholarly journals Preparation and piezoresistivity of carbon nanotube-coated sand reinforced cement mortar

2020 ◽  
Vol 9 (1) ◽  
pp. 1445-1455
Author(s):  
Song Gao ◽  
Jianlin Luo ◽  
Jigang Zhang ◽  
Fei Teng ◽  
Chao Liu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Cement Mortar ◽  
Aqueous Suspension ◽  
Ac Impedance ◽  
Stress Sensitivity ◽  
Multiwall Carbon Nanotube ◽  
Impedance Technique ◽  
Reinforced Cement ◽  
Coated Sand ◽  
Mechanical Strengths

Abstract Water and sand were used as the medium of multiwall carbon nanotube (MCNT) and prepared MCNT aqueous suspension and MCNT suspension-coated sand, respectively; afterwards, they were introduced into cement mortar (MNT/CM, MNTSM), respectively. Next, mechanical strengths and piezoresistive properties (DC resistivities (ρ v), AC impedances (Z r)) under cyclic loadings (σ c) of two types of MNT/CM and MNTSM nanocomposites were investigated to explore the intrinsic and self-sensing behaviors. Results reveal that MCNT can be evenly and well-coated on sand, which favors to achieve its intrinsic self-sensing property. Although the fraction changes in ρ v and Z r under the same σ c of MNTSM are both lower than those of MNT/CM, the stress sensitivity of MNTSM is only −1.16%/MPa (DC resistivity), −1.55%/MPa (AC impedance); its sensing linearity and stability (2.53, 2.45%; 2.73, 2.67%) are superior to those of MNT/CM (4.94, 2.57%; 3.78, 2.96%). Piezoresistivity using AC impedance technique is helpful to acquire balanced sensing sensitivity and stability while applied as intrinsic sensors in infrastructure.

Regioselective Competitive Adsorption of Water and Organic Vapor Mixtures on Pristine Single-Walled Carbon Nanotube Bundles

Langmuir ◽  
2008 ◽  
Vol 24 (11) ◽  
pp. 5746-5754 ◽  
Author(s):  
Sandeep Agnihotri ◽  
Pyoungchung Kim ◽  
Yijing Zheng ◽  
José P. B. Mota ◽  
Liangcheng Yang
Keyword(s):  
Carbon Nanotube ◽  
Competitive Adsorption ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Organic Vapor ◽  
Nanotube Bundles ◽  
Adsorption Of Water ◽  
Vapor Mixtures
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