title: Single-walled carbon nanotube/metalloporphyrin composites for the chemiresistive detection of amines and meat spoilage.
abstract: 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.
authors: Department of Chemistry and Institute for Soldier, Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA 02139 (USA).
authors: Sophie F
authors: SF
authors: Liu
authors: Department of Chemistry and Institute for Soldier, Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA 02139 (USA).
authors: Alexander R
authors: AR
authors: Petty
authors: Department of Chemistry and Institute for Soldier, Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA 02139 (USA).
authors: Graham T
authors: GT
authors: Sazama
authors: Department of Chemistry and Institute for Soldier, Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA 02139 (USA). tswager@mit.edu.
authors: Timothy M
authors: TM
authors: Swager
mesh_terms: D000588:Amines / Q000032:analysis*; D000818:Animals; D002103:Cadaverine / Q000032:analysis; D002645:Chickens; D003035:Cobalt / Q000737:chemistry; D004553:Electric Conductivity; D005740:Gases / Q000032:analysis; D008460:Meat / Q000032:analysis / Q000382:microbiology; D008665:Metalloporphyrins / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011700:Putrescine / Q000032:analysis; D017747:Seafood / Q000032:analysis / Q000382:microbiology; D013552:Swine; D013816:Thermodynamics
chemical_list: D000588:Amines; D005740:Gases; D008665:Metalloporphyrins; D037742:Nanotubes, Carbon; D003035:Cobalt; D002103:Cadaverine; D011700:Putrescine
keywords: amines; carbon nanotubes; cobalt; porphyrinoids; sensors