In this work novel 5,10,15,20 meso-tetraphenyl porphyrin (H2TPP) films have been deposited by means of a new
physical technique named glow discharge induced sublimation (GDS). A preliminary characterization has been
performed by means of scanning electron microscopy (SEM) and Fourier transform infra-red (FT-IR) analyses. SEM
images and infra-red analyses highlight the great surface roughness and the high purity of GDS films, respectively. For
comparison, H2TPP films have been also deposited by means of spin coating (SPIN) technique. Optical sensing
measurements, performed in differently concentrated ethyl alcohol (EtOH) atmospheres, highlight that GDS samples
yield higher response intensities than SPIN films, very short response times and complete recovery.
A novel soluble phthalocyanine compound, i.e zinc phthalocyanine (sulfonamide) has been synthesized by chemical
substitution of zinc phthalocyanine and used to produce thin solid films by means of the spin coating technique.
The chemical structure of the spin coated films has been investigated by FT-IR analysis. Atomic Force Microscopy
(AFM) has been used to characterize the film morphology and to measure the film thickness.
The spin coated films have been tested as optical sensing materials of volatile organic compounds such as methanol,
ethanol and 2-propanol. The change of optical reflectance of the films upon exposure to alcohol-vapour-containing
atmospheres has been measured versus alcohol concentration and exposure time. The films exhibit a fast and
reproducible response, with a complete and fast recovery in methanol and ethanol-containing atmospheres, while diffusion-driven effects appear during exposure to 2-propanol. The response and sensitivity of the films to ethanol vapour is higher than to methanol and 2-propanol.
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