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Nitric oxide gas sensors with functionalized carbon nanotubes
Author(s) -
Mäklin Jani,
Mustonen Tero,
Kordás Krisztián,
Saukko Sami,
Tóth Géza,
Vähäkangas Jouko
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200776118
Subject(s) - carbon nanotube , oxide , argon , resistive touchscreen , platinum , materials science , electrode , conductivity , drop (telecommunication) , saturation (graph theory) , chemical engineering , nanotechnology , nanotube , inorganic chemistry , analytical chemistry (journal) , chemistry , organic chemistry , catalysis , engineering , metallurgy , telecommunications , mathematics , combinatorics , computer science , electrical engineering
Nitric oxide (NO) gas sensing with carboxyl functionalized single‐ and multi‐walled carbon nanotubes (SWCNTs and MWCNTs) is demonstrated in this work. Stable solutions of the carboxylated nanotubes were made and then drop‐cast on alumina substrates equipped with gold electrodes and also with platinum heater elements. The obtained resistive nanotube sensors were tested in a 2‐point setup at different temperatures and NO gas concentrations up to 100 ppm in synthetic air and also in argon buffer. When exposed to NO, the conductivity of the sensors changed up to ∼40% for SWCNTs and ∼12% for MWCNTs; however, in the investigated regime, the response was found to be fairly independent on NO concentration. Though all sensors showed practically instantaneous gas response, the time needed for saturation (few tens of minutes) was found to be concentration dependent. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)