کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
740742 | 894186 | 2011 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Feedback-enabled discrimination enhancement for temperature-programmed chemiresistive microsensors Feedback-enabled discrimination enhancement for temperature-programmed chemiresistive microsensors](/preview/png/740742.png)
Temperature cycling can be used to enrich signal streams in gas phase sensing, however drift that can occur when repeatedly applying such cycles can degrade target recognition over time. A method for correcting heater drift through operational feedback has been implemented specifically to examine the level of performance improvement introduced for a single microhotplate-based chemiresistive sensing element exposed to multiple gas compositions. The element included ≈30 nm chemical vapor-deposited thin film of SnO2 formed over the interdigitated Pt electrodes, which acted as the transduction interface. Gas exposure experiments were performed using concentrations of methanol and ethane less than 100 μmol/mol in backgrounds of dry air and 15% relative humidity air. Removing temperature drift is shown to significantly decrease sensing signal drift, thereby facilitating enhanced target identification. Since this approach represents an operational adjustment, similar performance benefits are expected for sensing devices based upon other chemiresistive materials.
► A method for correcting heater drift through operational feedback was implemented.
► Performance improvements have been examined for a single sensing element.
► We exposed the sensor to concentrations <100 μmol/mol of methanol and ethane.
► Removing temperature drift significantly decreased sensing signal drift.
► Removing temperature drift enhanced target identification.
Journal: Sensors and Actuators B: Chemical - Volume 158, Issue 1, 15 November 2011, Pages 111–116