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. 2013 Jan 30;13(2):1754–1762. doi: 10.3390/s130201754

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 4. — Responses of the MWCNT based sensor decorated with Co nanoparticles to NH₃ gas at low (a) and high (b) gas concentration; Dependence of the responses on NH₃ concentration (c); Comparison of the sensor responses to NH₃, alcohol, and LPG which demonstrated that the sensor was selective to NH₃ (d).