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

Sensors

Petra Majzlíková²  Jiří Sedláპk²  Jan Práᘞk²  Jan Pekárek²  Vojtᆼh Svatoš²  Alexander G. Bannov¹  Ondᖞj Jaᘞk¹  Petr Synek¹  Marek Eliáš¹  Lenka Zajíčková¹ 

[1] Central European Institute of Technology, Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic; E-Mails:;Central European Institute of Technology, Brno University of Technology, Technická 3058/10, CZ-61600 Brno, Czech Republic; E-Mails:

关键词: carbon nanotubes;    microwave torch;    plasma enhanced chemical vapor deposition;    electronic properties;    electrochemical sensor;    gas sensor;    field emission;    IR absorption;   

DOI  :  10.3390/s150202644

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.