DRIFT ANALYSIS OF A Pd LOADED SnO2 BASED LINALOOL SENSOR
An approach is made in this work to analyze sensitivity drift in a Pd doped SnO2 sensor developed for detection of linalool, a significant aroma compound in tea. Prior to the drift analysis, an attempt is made to choose the optimum loading percentage of Pd in SnO2 for linalool sensing. An inexpensive and simplistic hydrothermal method is used to develop five different Pd doped SnO2 sensors (0.5 wt%, 2 wt%, 5 wt%, 6 wt% and 8 wt%) and compare their sensitivities when exposed to linalool vapour. The analysis shows that 6 wt% exhibits better sensitivity (62.7%) towards Linalool at a relatively lower temperature (100 0C) as compared to all the other synthesized sensors. Henceforth, extensive experiments were performed on the 6 wt% Pd doped SnO2 sensor for a period of one month to analyze its stability. Relative standard deviation and principal component analysis based drift analysis are performed to understand its changing attributes under repeated measurements.
drift;gas sensor; linalool; sensitivity
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