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Fabrication of Nafion-Coated a SWCNT Gas Sensor and Evaluation of the Measurement of the Extent of Decay of Fish
New Phys.: Sae Mulli 2020; 70: 114~118
Published online February 28, 2020;
© 2020 New Physics: Sae Mulli.

Chang-Duk KIM*1, Kiwon YANG1, Hyeong-Rag LEE1, Young-Soo SOHN2

1Department of Physics, Kyungpook National University, Daegu 41566, Korea
2Department of Biomedical Engineering, Catholic University of Daegu, Gyeongsan 38430, Korea
Correspondence to:
Received December 5, 2019; Revised January 9, 2020; Accepted January 24, 2020.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Single-walled carbon nanotubes (SWCNTs) have different electrical properties through surface reactions with ambient gases because of defects formed on the surface. The sensitivity of SWCNTs to gases varies depending on the presence or absence of a Nafion coating. In this study, a SWCNT gas sensor was fabricated to measure the extent of decay of fish. Ammonia (NH$ _{3}$) and trimethylamine (N(CH$ _{3}$)$ _{3}$, TMA) gases are released from fish as they decay. To confirm the applicability of the gas sensor to decaying fish, we investigated the reactivity of the designed SWCNT gas sensor to ammonia and TMA. To measure the extent of decay of fish, replaced a piece of mackerel of a certain size in a container maintained at 30 $ ^{\circ}$C, together with a SWCNT gas sensor, and we allowed the mackerel to decay naturally. The characteristics of the fabricated SWCNT gas sensor in the presence of decaying mackerel was monitored over time. The change in the electrical characteristics of the SWCNT gas sensor due to the decayed mackerel, along with the characteristics identified in TMA gas, confirmed the applicability of the gas sensor to measurements of fish spoilage.
PACS numbers: 68.43.-h, 73.22.-f, 73.63.Fg
Keywords: Single-walled carbon nanotube, Gas sensor, Decay gas, Fish decay

March 2020, 70 (3)
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