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Single‐Walled Carbon Nanotube/Metalloporphyrin Composites for the Chemiresistive Detection of Amines and Meat Spoilage
Author(s) -
Liu Sophie F.,
Petty Alexander R.,
Sazama Graham T.,
Swager Timothy M.
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201501434
Subject(s) - cadaverine , carbon nanotube , chemistry , food spoilage , putrescine , meat spoilage , chemiresistor , selectivity , amine gas treating , nanotechnology , organic chemistry , materials science , bacteria , biology , genetics , enzyme , catalysis
Chemiresistive detectors for amine vapors were made from single‐walled carbon nanotubes by noncovalent modification with cobalt meso ‐arylporphyrin complexes. We show that through changes in the oxidation state of the metal, the electron‐withdrawing character of the porphyrinato ligand, and the counteranion, the magnitude of the chemiresistive response to ammonia could be improved. The devices exhibited sub‐ppm sensitivity and high selectivity toward amines as well as good stability to air, moisture, and time. The application of these chemiresistors in the detection of various biogenic amines (i.e. putrescine, cadaverine) and in the monitoring of spoilage in raw meat and fish samples (chicken, pork, salmon, cod) over several days was also demonstrated.