▎ 摘　　要

NOVELTY - Preparing high selectivity nitrogen oxide sensor based on three-dimensional composite pleated ball involves weighing titanium aluminum carbide powder, adding to the mass fraction of 30-40% concentrated hydrochloric acid and lithium fluoride mixed to form the etching liquid, where the mass ratio of titanium aluminum carbide powder and lithium fluoride is 0.8-1:1, the mass volume ratio of the titanium aluminum carbide powder to the concentrated hydrochloric acid is 1g:30-50mL, stirring and reacting for 20-24 hours at 40-60degrees Celsius water bath, repeatedly washing the product after reaction by de-ionized water, centrifuging, until the supernatant pH is 6-7, then dispersing the washed product in 60-70 mL de-ionized water, ultrasonically dispersing for 30-60 minutes, centrifuging and taking the upper dispersion to obtain colloid dispersion, where the colloid dispersion concentration is 10-15mg/mL. USE - Method for preparing high selectivity nitrogen oxide sensor based on three-dimensional composite pleated ball used for detecting wearable nitrogen dioxide. and used for detecting carbon monoxide, carbon dioxide, hydrogen sulfide, hydrogen chloride, hydrogen nitride, nitrogen oxides, nitrogen sulfide and nitrogen dioxide oxides. ADVANTAGE - The three-dimensional Ti3C2Tx/rGO composite pleated ball has higher NO2 response and lower detection lower limit than pure Ti3AlC2 powder and pure rGO powder. DETAILED DESCRIPTION - Preparing high selectivity nitrogen oxide sensor based on three-dimensional composite pleated ball involves weighing titanium aluminum carbide powder, adding to the mass fraction of 30-40% concentrated hydrochloric acid and lithium fluoride mixed to form the etching liquid, where the mass ratio of titanium aluminum carbide powder and lithium fluoride is 0.8-1:1, the mass volume ratio of the titanium aluminum carbide powder to the concentrated hydrochloric acid is 1g:30-50mL, stirring and reacting for 20-24 hours at 40-60degrees Celsius water bath, repeatedly washing the product after reaction by de-ionized water, centrifuging, until the supernatant pH is 6-7, then dispersing the washed product in 60-70 mL de-ionized water, ultrasonically dispersing for 30-60 minutes, centrifuging and taking the upper dispersion to obtain colloid dispersion, where the colloid dispersion concentration is 10-15mg/mL, taking 5-10 mL colloidal dispersion, then adding the concentration of 10-15 mg/mL graphene oxide dispersion, colloidal dispersion and the mass ratio of the graphene oxide is 1.8-2.2:1, fully stirring and ultrasonic spraying, using nitrogen with flow speed of 2-6 L/minutes to bring the ultrasonic atomizing product into the tubular furnace with stable temperature at 600-800degrees Celsius. The obtained three-dimensional composite pleated ball powder is brought into the electrostatic collecting device located at the tail portion of the tubular furnace for collecting after passing through the tubular furnace, the graphene oxide is converted into reducing graphene oxide.