scholarly journals Towards gas sensing with vertically aligned carbon nanotubes interrogated by THz radiation pulses

2018 ◽  
Vol 58 (1) ◽  
Author(s):  
Wissem Zouaghi ◽  
Laith Hussein ◽  
Mark D. Thomson ◽  
Qamar-ul Islam ◽  
Norbert Nicoloso ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensing ◽  
Charge Carriers ◽  
Thz Radiation ◽  
Vertically Aligned Carbon Nanotubes ◽  
As Doping ◽  
Doping Effects ◽  
Aligned Carbon Nanotubes ◽  
Frequency Regime ◽  
Vertically Aligned

When vertically aligned carbon nanotubes (VACNT) are exposed to gases, their dielectric properties may change by mechanisms such as doping effects or a modification of the scattering channels of the mobile charge carriers of the VACNT. This report provides first data of a study which aims at an exploration of such conductivity changes in the THz frequency regime. The test gases are NH3 and SO2 which are known to act as donors, respectively as acceptors when interacting with the carbon nanotubes. Our measurements confirm the doping effects. This may open the way towards gas sensors based on the VACNT interrogated by THz radiation, where the VACNTs act as an accumulation volume for certain species contained in a gas stream.

scholarly journals Gas sensing with gold-decorated vertically aligned carbon nanotubes

2014 ◽  
Vol 5 ◽  
pp. 910-918 ◽  
Author(s):  
Prasantha R Mudimela ◽  
Mattia Scardamaglia ◽  
Oriol González-León ◽  
Nicolas Reckinger ◽  
Rony Snyders ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Nitrogen Dioxide ◽  
Room Temperature ◽  
Gas Sensing ◽  
Chemical Vapor ◽  
Vertically Aligned Carbon Nanotubes ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned ◽  
Carbon Nanotube Forests

Vertically aligned carbon nanotubes of different lengths (150, 300, 500 µm) synthesized by thermal chemical vapor deposition and decorated with gold nanoparticles were investigated as gas sensitive materials for detecting nitrogen dioxide (NO2) at room temperature. Gold nanoparticles of about 6 nm in diameter were sputtered on the top surface of the carbon nanotube forests to enhance the sensitivity to the pollutant gas. We showed that the sensing response to nitrogen dioxide depends on the nanotube length. The optimum was found to be 300 µm for getting the higher response. When the background humidity level was changed from dry to 50% relative humidity, an increase in the response to NO2 was observed for all the sensors, regardless of the nanotube length.

DEVELOPMENT OF A BROADBAND ELECTROMAGNETIC RADIATION ABSORBER BASED ON MULTIWALL CARBON NANOTUBES AND ITS APPLICATION IN BOLOMETRIC RECEIVERS

2021 ◽  
pp. 75-88
Author(s):  
D. V. Sheglov ◽  
M. A. Dem’yanenko ◽  
O. I. Semenova ◽  
S. V. Rodyakin ◽  
D. A. Nasimov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Absorption Coefficient ◽  
Spectral Region ◽  
Spectral Dependence ◽  
Multiwall Carbon Nanotubes ◽  
Thz Radiation ◽  
Vertically Aligned Carbon Nanotubes ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned ◽  
Multiwall Carbon

This work is devoted to the development of a technique for obtaining an array of multi-walled vertically aligned carbon nanotubes (VACNT) with a thickness of up to 120 μm on Si/Al2O3/Fe substrates and to the study of their absorbing properties in the THz spectral region, as well as to the assessment of their prospects as a broadband THz radiation absorber based on calculations of the spectral dependence of absorption coefficient for traditional and inverted-type bolometric devices. It is shown that the absorption of the VACNT array transferred onto the Revalpha polymer substrate reaches 70–80% in the wavelength range of 40–200 µm. Calculations show that traditional bolometers with an absorber based on VACNT have the best sensitivity at wavelengths less than 100 μm, and inverted bolometers also having a VACNT layer have the best sensitivity at wavelengths exceeding 50 μm, which makes them complementary to each other.

Correlation and Comparison Between Thermodynamic Aspects and Cytocompatibility of Cells on Superhydrophobic and Superhydrophilic Vertically Aligned Carbon Nanotubes

2013 ◽  
Vol 3 (2) ◽  
pp. 155-165 ◽  
Author(s):  
Teresa C.O. Marsi ◽  
Marcus A.F. Corat ◽  
Mirian M. Machado ◽  
Evaldo J. Corat ◽  
Fernanda R. Marciano ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Vertically Aligned Carbon Nanotubes ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned
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