Enhanced NO2 gas-sensing performance by core-shell SnO2/ZIF-8 nanospheres.

Timely detection of harmful, poisonous and air pollutant gases is of vital importance to the protection of human beings from exposure to rigorous gases. The development of gas-sensing devices based on sphere-like porous SnO2/ZIF-8 nanocomposites is required to overcome this challenge. Nanostructures with high surface area, more porosity and hollow interior provide plenty of active cites for high responses in metal oxide gas sensors. The engineered gas sensors have excellent sensing sensitivity (164), rapid response and recovery times (60, 45 s), and favorable selectivity for NO2 gases under 300 °C. Consequently, NO2 gas sensors based on core-shell SnO2/ZIF-8 nanospheres are regarded viable capacity industrial applicants.