Performance of Pd Doped SnO2 as Sensing Material for Tea Aromatic Chemicals

A facile hydrothermal method was employed to synthesize a Pd doped SnO2 gas sensor. The sensor was experimented with four significant chemicals present in tea at four different operating temperatures. It is observed that the sensor could be used for linalool detection which is an important compound of black tea, responsible for its flavor. The optimum operating temperature is found to be 150 °C at which the sensor showed most favorable sensitivity, response time, and recovery time. Extensive experiments were carried out with different concentrations of linalool gas and the resistance variation of the sensor was observed with variation in gas concentration. The physical characteristics of the sensor were comprehended via X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy, and atomic force microscopy analysis.