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Copper Fluoride Doped Polypyrrole for Portable and Enhanced Ammonia Sensing at Room Temperature
Author(s) -
Salimi Mohsen,
Rahmani Fereidoon,
Hosseini Seyed Mohammad R. M.
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202101444
Subject(s) - polypyrrole , materials science , ammonia , conductive polymer , doping , fourier transform infrared spectroscopy , fluoride , polymerization , polymer , detection limit , electrode , chemical engineering , inorganic chemistry , optoelectronics , composite material , chemistry , organic chemistry , chromatography , engineering
Point‐of‐care (POC) monitoring of breath ammonia has emerged as a great approach for non‐invasive chronic kidney disease (CKD) diagnosis. Polypyrrole (PPy) is recognized as a suitable polymer material for breath ammonia sensing. Here we describe the copper fluoride (CuF 2 ) doping effect on sensing performance of the ammonia gas sensor based on PPy. At first, PPy was synthesized by chemical oxidative polymerization and characterized by scanning electron microscopy, energy dispersive X‐ray analysis, and Fourier Transform Infrared Spectroscopy techniques. The CuF 2 was doped to the polymer by an aqueous ion exchange process. A portable sensing system was developed for portable ammonia detection by measuring the resistance variation of the fabricated electrode from synthesized materials. The gas‐sensing results disclose that the CuF 2 ‐PPy based sensor displays the highest response to 2 ppm NH 3 , which is 3 times higher than that of the pure PPy sensor. The low limit of detection (LOD) value for pure PPy was found to be 0.19 ppm, which has been decreased to 0.02 ppm for CuF2 doped PPy. The CuF 2 ‐PPy resistive sensor exhibits a sustainable, selective, and stable sensing response to ammonia even in the presence of 60 % humidity. Moreover, the fabricated setup is low‐cost, user‐friendly, and suitable enough to be used at the point of care and CKD diagnosis applications.