Sensing Properties of Multiwalled Carbon Nanotubes Grown in MW Plasma Torch: Electronic and Electrochemical Behavior, Gas Sensing, Field Emission, IR Absorption

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Authors

MAJZLÍKOVÁ Petra SEDLÁČEK Jiří PRÁŠEK Jan PEKÁREK Jan SVATOŠ Vojtěch BANNOV Alexander JAŠEK Ondřej SYNEK Petr ELIÁŠ Marek ZAJÍČKOVÁ Lenka HUBÁLEK Jaromír

Year of publication 2015
Type Article in Periodical
Magazine / Source Sensors
MU Faculty or unit

Central European Institute of Technology

Citation
Web web vydavatele
Doi http://dx.doi.org/10.3390/s150202644
Field Plasma physics
Keywords carbon nanotubes; microwave torch; plasma enhanced chemical vapor deposition; electronic properties; electrochemical sensor; gas sensor; field emission; IR absorption
Attached files
Description Vertically aligned multi-walled carbon nanotubes (VA-MWCNTs) with an average diameter below 80 nm and a thickness of the uniform VA-MWCNT layer of about 16 mu m were grown in microwave plasma torch and tested for selected functional properties. IR absorption important for a construction of bolometers was studied by Fourier transform infrared spectroscopy. Basic electrochemical characterization was performed by cyclic voltammetry. Comparing the obtained results with the standard or MWCNT-modified screen-printed electrodes, the prepared VA-MWCNT electrodes indicated their high potential for the construction of electrochemical sensors. Resistive CNT gas sensor revealed a good sensitivity to ammonia taking into account room temperature operation. Field emission detected from CNTs was suitable for the pressure sensing application based on the measurement of emission current in the diode structure with bending diaphragm. The advantages of microwave plasma torch growth of CNTs, i.e., fast processing and versatility of the process, can be therefore fully exploited for the integration of surface-bound grown CNTs into various sensing structures.
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