Sensing Properties of Multiwalled Carbon Nanotubes Grown in MW Plasma Torch: Electronic and Electrochemical Behavior, Gas Sensing, Field Emission, IR Absorption
Petra Majzlíková,
Jiří Sedláček,
Jan Prášek,
Jan Pekárek,
Vojtěch Svatoš,
Alexander G. Bannov,
Ondřej Jašek,
Petr Synek,
Marek Eliáš,
Lenka Zajíčková,
Jaromír Hubálek
Affiliations
Petra Majzlíková
Central European Institute of Technology, Brno University of Technology, Technická 3058/10, CZ‑61600 Brno, Czech Republic
Jiří Sedláček
Central European Institute of Technology, Brno University of Technology, Technická 3058/10, CZ‑61600 Brno, Czech Republic
Jan Prášek
Central European Institute of Technology, Brno University of Technology, Technická 3058/10, CZ‑61600 Brno, Czech Republic
Jan Pekárek
Central European Institute of Technology, Brno University of Technology, Technická 3058/10, CZ‑61600 Brno, Czech Republic
Vojtěch Svatoš
Central European Institute of Technology, Brno University of Technology, Technická 3058/10, CZ‑61600 Brno, Czech Republic
Alexander G. Bannov
Central European Institute of Technology, Masaryk University, Kamenice 5, CZ‑62500 Brno, Czech Republic
Ondřej Jašek
Central European Institute of Technology, Masaryk University, Kamenice 5, CZ‑62500 Brno, Czech Republic
Petr Synek
Central European Institute of Technology, Masaryk University, Kamenice 5, CZ‑62500 Brno, Czech Republic
Marek Eliáš
Central European Institute of Technology, Masaryk University, Kamenice 5, CZ‑62500 Brno, Czech Republic
Lenka Zajíčková
Central European Institute of Technology, Masaryk University, Kamenice 5, CZ‑62500 Brno, Czech Republic
Jaromír Hubálek
Central European Institute of Technology, Brno University of Technology, Technická 3058/10, CZ‑61600 Brno, Czech Republic
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 µm 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.
