Journal
COMMUNICATIONS CHEMISTRY
Volume 5, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s42004-022-00797-y
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Funding
- National Science and Engineering Council of Canada [RGPIN-2015-05796, RGPIN-2021-03387]
- Canada Research Chairs Program [950-230754]
- CFI
- NSERC
- University of Saskatchewan
- Government of Saskatchewan
- Western Economic Diversification Canada
- National Research Council Canada
- Canadian Institutes of Health Research
- National Center for Scientific Research (CNRS)
- French Alternative Energies and Atomic Energy Commission (CEA)
- Ile-de-France Regional Council
- Essonne Department Council
- Centre Regional Council
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By adjusting factors such as the film morphology and crystal polymorphs, the sensitivity of phthalocyanine-based organic thin-film transistors to THC vapor can be increased.
Phthalocyanine-based organic thin-film transistors (OTFTs) have been demonstrated as sensors for a range of analytes, including cannabinoids, in both liquid and gas phases. Detection of the primary cannabinoids, delta(9)-tetrahydrocannabinol (THC) and cannabidiol (CBD), is necessary for quality control and regulation, however, current techniques are often not readily available for consumers, industry, and law-enforcement. The OTFT characteristics, X-ray diffraction (XRD) spectra, and grazing incident wide angle x-ray scattering (GIWAXS) spectra of two copper and three zinc phthalocyanines, with varying degrees of peripheral fluorination, were screened to determine sensitivity to THC vapor. Unsubstituted ZnPc was found to be the most sensitive material and, by tuning thin-film morphology, crystal polymorphs, and thickness through altered physical vapor deposition conditions, we increased the sensitivity to THC by 100x. Here we demonstrate that deposition conditions, and the resulting physical film characteristics, play a significant role in device sensitization.
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