Amperometric Sensors: Features and Benefits
- Microband electrodes
- High sensitivity/Low noise measurement of gas concentration
- Fast Response
- Tolerant of lower conductivity electrolytes, e.g. SPE
- Solid Polymer Electrolyte (SPE)
- Long life, leak free
- Room temperature operation = very low power
- Novel Fabrication Methods
- Very small size
- Low cost
- Multiple sensor elements in a single device
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Amperometric Sensors: Operating Principles
- Solid Electrolyte (SPE)
- Exposed microband working electrodes
- Usually gold, platinum or carbon
- Analyte reaction occurs at working electrode, releasing electrons.
- e.g. CO + H2O ? CO2 + 2H+ +2e-
- Counter/Reference Electrode supplies electrons and provides constant potential versus working electrode
- e.g. ½ O2 + 2H+ + 2e- ? H2O
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Operation of Amperometric Sensors
- Sensors operate at room temperature and are inherently low power
- Analyte reaction occurs at specific applied voltage
- Sensor output (current) is proportional to gas concentration
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