Tailoring responsivity with engineered porous Cu 2 O hexapods architecture towards high-performance H 2 S gas-sensing

We report on the development of a new type of nanoscale Cu 2 O hexapods with high H 2 S gas-sensing responsivity under low work temperature with engineering porous architectures through a rational synthesis design. The developed Cu 2 O hexapods show porous structure with outer diameters of 1–2 μm and the rodlike particles with mesoporous of 5–8 nm that constructed through the nanocrystals of 5–10 nm. The sensor based on porous Cu 2 O hexapods were synthesized and researched for the H 2 S-sensing properties. The response is 8.93 for the porous Cu 2 O hexapods, corresponding to the operating temperature 160 °C. By comparison, the response of the porous Cu 2 O hexapods is higher than the Cu 2 O hexapod during the detection range from 5 to 5000 ppm. The porous architecture could offer abundant active sites that promote the diffusion and adsorption procedure of the gas molecules. Furthermore, the response of porous Cu 2 O hexapods to 50 ppm H 2 S is 10.2 MΩ, the response time (τ res ) is within 0.11 s, and the recovery time (τ recov ) is 31.0 s. Hence, using porous Cu 2 O hexapods architecture is beneficial to improve gas response, decrease the work temperature and shorten response time process.