Abstract
Metal phthalocyanines bearing electron-withdrawing fluorine substituents were synthesized a long time ago, but interest in the study of their films has emerged in recent decades. This is due to the fact that, unlike unsubstituted phthalocyanines, films of some fluorinated phthalocyanines exhibit the properties of n-type semiconductors, which makes them promising candidates for application in ambipolar transistors. Apart from this, it was shown that the introduction of fluorine substituents led to an increase in the sensitivity of phthalocyanine films to reducing gases. This review analyzes the state of research over the last fifteen years in the field of applications of fluoro-substituted metal phthalocyanines as active layers of gas sensors, with a primary focus on chemiresistive ones. The active layers on the basis of phthalocyanines with fluorine and fluorine-containing substituents of optical and quartz crystal microbalance sensors are also considered. Attention is paid to the analysis of the effect of molecular structure (central metal, number and type of fluorine substituent etc.) on sensor properties of fluorinated phthalocyanine films.
Highlights
Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Lavrentiev Pr., 630090 Novosibirsk, Russia; Abstract: Metal phthalocyanines bearing electron-withdrawing fluorine substituents were synthesized a long time ago, but interest in the study of their films has emerged in recent decades
This is due to the fact that, in contrast to unsubstituted phthalocyanines, the films of some fluorinated phthalocyanines exhibit the properties of n-type semiconductors, which makes them promising candidates for application in ambipolar transistors [18,19,20]
They found a shift of the bands at 253 metal phthalocyanines active layers are in Table 2.vibration and the vibration and 1529 cm−1, which as were attributed to summarized the Cu-Nα stretching associated with the cavity change in the phthalocyanine macrocycle, respectively, after interaction with Cl2
Summary
For the use of phthalocyanines as active layers of chemical sensors, it is important beenbeen discussed in detail in recent reviews [17,30]. For the use of phthalocyanines as active layers chemical sensors, it is important phology on the surface of an electrode. The method of deposition of films is determined phology on the surface of an electrode. For the use of phthalocyanines as active layers of chemical sensors, itis important phology on thedirectly surface of ancompound electrode. Is known that phthalocyanines with that a phthalocyanine is deposited as a thin film with a controlled structure and morby the properties of the compound itself. The method of deposition of films is determined are insoluble in the phology preparation of active layers of gas sensors. Table homogeneous films discussed in detail in recent [17,30].rings common organic solvents, but can bephthalocyanines
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