New thermistor material for thermistor bolometer: material preparation and characterization

摘要

Abstract: Structural, electrical, and infrared optical properties of screen-printed vanadium oxide thick films have been studied. It is seen that the original starting material, in the form of V$-2$/O$-3$/, undergoes a global transformation to its next higher oxide V$-2$/O$-5$/ during firing. This has been confirmed through differential thermal analysis (DTA) and x-ray diffraction analysis. The crystalline morphology of the transformed V$-2$/O$- 5$/ seems to improve as a function of firing temperature in the range of 400- 600$DGR@C. The associated screen-printed resistors have temperature coefficient of resistance in the range of $MIN@37,000 to $MIN@17,000 ppm per K over a temperature range of $MIN@65 to $PLU@155$DGR@C and thermistor constant equal to 2000 K, which are independent of firing temperature. It is observed that both electrical resistivity and infrared emissivity decreases with increase of firing temperature, attaining values 1.12 $MUL 10$+2$/ ohm cm for electrical resistivity and 82% for infrared emissivity at a firing temperature of 550$DGR@C.!