NITROGEN OXIDE CONCENTRATION SENSOR AND A METHOD FOR FORMATION ITS LIGHT-SENSITIVE LAYER Russian patent published in 2007 - IPC G01N27/12 

FIELD: analytical instrumentation engineering.

SUBSTANCE: invention is designed for use in environmental monitoring systems and provides nitrogen oxide concentration sensor comprising support carrying electrodes, iron polyphthalocyanine-based sensitive layer with continuous conjugation system, and resistive heater. Method of forming sensitive layer comprises preparation of iron polyphthalocyanine with continuous conjugation chain followed by de[positing it onto support with electrode system formed on the surface thereof. Above preparation is accomplished via synthesis of iron polyphthalocyanine under an inert atmosphere from reaction mixture of 2.0 g pyromellitic acid tetranitile, 0.035 g urea, and 0.95 g anhydrous ferrous chloride in 70 mL nitrobenzene heated for 5 h at 210^°C, after which reaction medium is filtered, nitrobenzene-insoluble precipitate is washed with boiling ethanol and dried. Deposition of iron polyphthalocyanine with continuous conjugation chain on support is performed using vacuum thermal spraying technique for 4-7 min at 1000-1200^°C.

EFFECT: increased sensitivity and selectivity of sensor toward nitrogen oxide in mixture with other gases.

3 cl, 3 dwg, 2 tbl, 4 ex