Fluoro-Substituted Metal Phthalocyanines for Active Layers of Chemical Sensors

• Published in: Chemosensors Vol. 9; no. 6; p. 133
• Main Authors: Klyamer, Darya, Bonegardt, Dmitry, Basova, Tamara
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-06-2021
• Subjects: Chemical sensors; chemiresistive sensors; Composite materials; Electrodes; Fluorination; Fluorine; fluoro-substituents; Gas sensors; Materials substitution; Metal phthalocyanines; Microbalances; Molecular structure; Morphology; N-type semiconductors; Nitrogen dioxide; optical sensors; Quartz crystal microbalance; Quartz crystals; Sensors; Thin films; Transistors
• ISSN: 2227-9040; 2227-9040
• DOI: 10.3390/chemosensors9060133

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.