Self-assembled colloidal crystals by solvent thermal evaporation are used as hard templates

and three-dimensional ordered macroporous SnO

2

with different Cu-doped concentrations are prepared using the sacrificial template method

and the gas-sensing performance change of macroporous SnO

2

to H

2

S is studied with different Cu-doping levels

and the thermal pulse-assisted method is used to improve recovery properties of the se

nsor at low temperatures.The characterization results confirm that SnO

2

has a three-dimensional ordered porous structure with periodic dense rows of stacking

and the doping of Cu ions does not damage the ordered macroporous structure

but does cause lattice distortion and more defects

further affecting the gas-sensitive performance of the sensor.The gas-sensitive test results show that SnO

2

with 0.5% doping performs the best

with gas-sensitive responses as high as 72.9 and 187.3 for volume fractions of 5×10

-6

and 10×10

-6

H

2

S

respectively

at the optimal operating temperature of 50℃ and with the aid of thermal pulse

and exhibits good selectivity

humidity resistance and long-term stability.Providing a solution for the design of porous materials

it also offers a novel approach for improving the low-temperature gas-sensitive response of sensitive materials.