Optical sensing responses of tetraphenyl porphyrins toward alcohol vapours: A comparison between vacuum evaporated and spin-coated thin films

Growth, characterization and sensing capabilities of 5,10,15,20-meso-tetraphenyl iron (III) porphyrin chloride films obtained by means of a novel plasma-based deposition technique

“…The B and Q bands both arise from -* transitions and can be explained by considering the "Gouterman four orbital model" [30]. The presence of the characteristic Fe(TPP)Cl optical B and Q bands into the GDS and SPIN films clearly indicates the presence of integer molecules into both the solid films: this experimental evidence, in well agreement with other literature data [22,27], is particularly important for the GDS samples pointing out the absence of molecular iron decomplexation effects into the produced films.…”

“…chemical solvent) and allow to obtain samples characterized by very high purity [21,10]. Sample purity plays a basic role in the gas sensing field: in fact the presence of retained solvent, which represents a frequent drawback in organic films produced through standard chemical methods, can hinder partially the interaction between the film and the analyte molecules [22].…”

Fluorescent-Dye Doped Thin-Film Sensors for the Detection of Alcohol Vapors

“…The reactions are mainly through hydrogen bonding between alcohols and the phosphonate cavitand, and the sensor is sensitive for C1-C4 alcohols ranging from 4 to 600 mg·kg −1 [28]. Other techniques of interest for alcohol detection involve silicon quantum dots coupled to fiber optics [29] and developing optical sensors from tetraphenyl porphyrins [30]. Also, Mohr and coworkers have produced an optical sensor for alcohols using a synthesized fluorescent compound Chromoionophore IX (CIX) prepared in a poly(vinyl chloride) (PVC) membrane for the detection of alcohols in the liquid phase [31]- [33].…”

Preparation and characterization of 5,10,15,20‐tetraphenylporphyrin Langmuir films for gas chemsensor applications

“…[7] For instance, the reported changes in the optical properties of 5,10,15,20-tetraphenyl-21H,23H-porphine (H 2 TPP) and 5,10,15,20-tetraphenyl-21H,23H-porphine cobalt (CoTPP) in response to alcohol vapors have suggested differences in molecular organization between thin films created by spin coating and vacuum evaporation. [8] Some research groups have focused their attention on investigating the effect of the orientation and conformation of porphyrins films on the optical properties of these macrocycles. In theory, they could be specifically designed to make these compounds good sensing materials for detecting different gaseous species or volatile organic compounds (VOCs).…”