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The coexistence of a conjugated organic macrocyclic structure and a transition metal center provides MPor with numerous properties that fostered their use in catalysis, [2,3] theranostic, [4] and nonlinear optic. [5] Another application area of MPor is chemosensing, [6] in which interactions with a chemical analyte modifies the physical properties of MPor film that can be transduced into a measurable signal. Based on the nature of signal transductions, MPorbased optical, acoustic, magnetic, and electrical chemosensors have been developed [7] to detect myriad of species such as redox gases, [8] volatile organic compounds, [9] and inorganic biochemical species. [10] Particularly, MPor chemosensors based on electrical transductions such as chemiresistors, ChemFet, and conductometric sensors have drawn interests exploiting the semiconducting nature of MPor, which can be effectively tuned by adding substituents to its macrocyclic periphery or ligands at the metal center. Song et al. reported a chemiresistor based on highly ordered nanotubes of 5,10,15,20-tetrakis(4-aminophenyl)porphyrin zinc(II) to selectively detect NO 2 at sub-ppm concentration. [11] Elsewhere, self-assembled monolayers of MPor films in ChemFet configuration were used to detect organic vapors and redox gases, exhibiting the strong influence of metal atom on sensors responses. [12,13] However, most of the MPor are poor conducting materials owing to low π-conjugation, limiting the sensors performances. To overcome this limitation, different approaches have been adopted such as forming a composite with more conducting materials like carbon nanotubes, [14,15] conductive polymers, [16,17] or metal oxides. [18,19] An alternative solution to the MPor low conductivity can be the formation of highly conjugated porphyrin polymers to extend the molecular π-system. However, the synthesis of conjugated porphyrin polymers requires significant synthetic efforts. In 2001, Tsuda and Osuka provided a new route toward the easy synthesis of directly fused metalloporphyrins, known as porphyrin tapes (Scheme 1). [20] Porphyrin tapes possess a series of outstanding properties such as electronic transitions in the IR region, [20] increased catalytic activity, [21] two-photon absorption, [22] and low conductance attenuation factors. [23,24] The synthesis of porphyrin tapes relies on the Modulating the interfacial charge alignments by molecular engineering in an organic heterojunction device is a smart strategy to improve its conductivity, which can be exploited in high-performance gas-sensor development. Herein, the fabrication of new organic heterojunction devices based on porphyrin tapes and phthalocyanines and their potentiality in ammonia sensing at different relative humidity (rh) are investigated. The devices are built using dry approach relying on oxidative chemical vapor deposition for simultaneous synthesis, doping, and deposition of the porphyrin tape layer and physical vapor deposition of phthalocyanine layer. The association of the porphyrin tapes with copper ph...
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