ИСТИНА

In this work we present an approach to the creation of a fully printed polymer device applicable as a reusable capacitive gas sensor. Technique and optimal conditions for consistent polymer layers (conductive contacts, dielectric, gate) fabrication by screen printing were developed and the printed polymer device (capacitor) were obtained [ ]. Efficient adhesion of printed functional layers to each other and to the substrate surface was provided using substrates/dielectric surfaces modification by oligo-3-aminopropyltriethoxysilane (oAPTS) followed by thermal annealing [ ]. It was shown that fabricated sensors reversibly respond to ammonia presence at wide range of concentration from 0 to 24 ppm with the limit of detection of 1,5 ppm and also don't lose their performance in humid air up to 40% relative humidity, although the limit of detection increases in humid air up to 4 ppm. In addition, printed devices can be used as disposable sensors for the toluene presence in the atmosphere at concentrations of 0.1 -15 vol.%, that allows to use them for toluene leaks detection (Fig. 1). Using of the printed capacitive sensors (PCS) in combination with gas sensors based on organic field-effect transistors makes possible to significantly expand the range of measured ammonia concentrations: from concentrations comparable to the TLV of residential areas to concentrations requiring immediate evacuation.