Selective dual detection of hydrogen sulfide and methyl mercaptan using CuO/CuFe2O4 nanopattern chemiresistors

Volatile sulfur compounds (VSCs), such as H2S and methyl mercaptan (MM), are malodorous and harmful gases. H2S and MM share analogical origins. However, they should be discriminated because of their different odor thresholds and health impacts. Herein, a nanopattern chemiresistor composed of aligned CuO-loaded CuFe2O4 nanofibers was prepared via direct-write near-field electrospinning. The CuO/CuFe2O4 sensor with the atomic ratio of [Cu]:[Fe] = 3:4 exhibited extremely high responses to ppm-level H2S and MM compared with other nanopattern sensors with different compositions ([Cu]/[Fe] = 2:4, 4:4, and 0:1). This can be attributed to the gas-accessible morphology of the nanopattern sensor, the formation of a nanoscale p(CuO)-n(CuFe2O4) junction, and the intimate reaction between the discretely loaded CuO nanoparticles and the VSCs. Furthermore, the CuO/CuFe2O4 sensor exhibited high selectivities to H2S and MM at 200 degrees C and 400 degrees C, respectively. The selective dual detection of H2S and MM using a single CuO/CuFe2O4 sensor via the simple modulation of the sensing temperature opens a new route for indoor air quality monitoring, ventilation control, halitosis diagnosis, and wine quality monitoring.

Automated summary

The study developed a nanopattern chemiresistor consisting of aligned CuO-loaded CuFe2O4 nanofibers via direct-write near-field electrospinning. The CuO/CuFe2O4 sensor showed high responses to ppm-level H2S and MM, attributed to the gas-accessible morphology, formation of a nanoscale p(CuO)-n(CuFe2O4) junction, and intimate reaction between CuO nanoparticles and VSCs. Additionally, the sensor exhibited selectivities to H2S and MM at different temperatures, enabling dual detection and providing new possibilities for indoor air quality monitoring, ventilation control, halitosis diagnosis, and wine quality monitoring.