Sub-ppm detection of H2S with CuO-loaded SnO2 hollow nanospheres deposited on interdigitated electrodes

Hydrogen sulfide is a toxic, highly corrosive and pollutant gas, but also a key-biomarker in disease diagnosis trough breath analysis. Its detection at very low level is therefore relevant and can be achieved with chemiresistors. The present work proposes a solution consisting in a facile synthesis of CuO-loaded SnO2 hollow nanospheres deposited on interdigitated electrodes (IDEs). Synthesis, chemical and electrical character-ization, deposit process of the sensing layer and gas sensing capabilities of the sensing platform are presented. CuO loaded Sno2 sensing platforms achieved a successful sub-ppm detection at an operating temperature of 100 degrees Celsius.