Bias Potential Mediated NO₂ Gas Sensor With NiCo₂O₄ Hollow Micro-Spheres

A systematic gas sensing study of a lithographically patterned metal interdigitated transducer and popular spinel-compound i.e. NiCo2O4-based device (prepared by spray dry process) was carried out with a variation in bias potential (1 mV-1000 mV). The study shows that the bias voltage influences various sensing parameters including sensitivity, response, and recovery time, etc. of test gas (NO <tex-math notation="LaTeX">_2) </tex-math> at a fixed temperature ( <tex-math notation="LaTeX">150∘ C </tex-math> ). This confirms that only getting current levels in a measurable range shouldn't be the end of the experiment rather a complete analysis and trade-off among sensing parameters need to be established before selecting the final bias potential of a chemiresistive device.