I want to realize a gas sensor (CO,x, NOx) using SnO2 on SiO2 substrate. How can I put electrode contact on the material grown by spray method and doped with Sb or Ag for different concentration..I need electronic scheme to obtain signal on dwawing table .
For making the electrodes one can use basic silver paint and copper wires contacting them. These electrodes can sustain up to 400 C for measurements. It is beneficial to define the area of film exposed to gases. For measurement, depending on the resistance of the film one can use regular multimeters (ranges from 50 Mohm to 1 ohm) with RS232 probe connection to computer for recording data (R vs time). I think this much is sufficient for first trial.
I used the potential divider for measured the sensor resistance.
You can use pellet form also. We used as optical sensor substrate. you can make electrical contact for electrical sensor
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