Surface engineering of zinc phthalocyanine organic thin-film transistors results in part-per-billion sensitivity towards cannabinoid vapor.
Zachary J ComeauRosemary R CranstonHalynne R LamontagneCory S HarrisAdam J ShuhendlerBenoit H LessardPublished in: Communications chemistry (2022)
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, Δ 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.
Keyphrases
- quality control
- high resolution
- oxide nanoparticles
- photodynamic therapy
- physical activity
- mental health
- dual energy
- room temperature
- electron microscopy
- density functional theory
- cardiovascular disease
- optical coherence tomography
- gold nanoparticles
- magnetic resonance
- computed tomography
- molecular dynamics
- label free
- real time pcr
- crystal structure