Preparation method of sulfur-doped polyaniline and titanium dioxide composite nanowire gas-sensing film with mercury sensing response
A technology of titanium dioxide and nanowires, which is applied in the field of preparation of sulfur-doped polyaniline and titanium dioxide composite nanowire gas-sensitive films, can solve problems such as research reports and practical applications of mercury gas-sensitive films that have not yet been seen, and achieve high application value and preparation The effect of low cost and simple process
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[0025] A kind of preparation method of sulfur-doped polyaniline and titanium dioxide nanowire thin film with mercury gas sensitive response of the present invention, comprises the following steps,
[0026] 1) Preparation of titanium dioxide nanowires
[0027] Aniline, ammonium persulfate, hydrochloric acid, titanium foil, sodium hydroxide and thiourea, according to the molar ratio of aniline and ammonium persulfate 3.5:1, the concentration of hydrochloric acid is 1mol / L, used to adjust the pH value of the reaction process; titanium foil The purity is 99.6%, the size is length 2cm*width 1cm*thickness 0.1cm, the concentration of sodium hydroxide is 1mol / L, and the concentration of thiourea is 0.13mol / L or 0.195mol / L to make titanium dioxide nanowires;
[0028] 2) In situ polymerization of polyaniline on titania nanowires
[0029] First, polish the titanium foil, place it in an etching solution prepared by hydrofluoric acid, nitric acid and water at a volume ratio of 2:5:5, etch...
Embodiment 1
[0033] Firstly, the titanium foil is ground and polished, then etched in etching solution (hydrofluoric acid, nitric acid, water volume ratio 2:5:5) for 20s, then ultrasonically cleaned three times in pure deionized water, and ultrasonically cleaned in pure acetone Wash three times. After rinsing with a large amount of water, place the titanium sheet in the lining of a 50mL reactor, and add 20mL of 1mol / L sodium hydroxide. Then the reaction kettle was placed in an oven at 180°C for 24 hours to generate titanic acid (H 2 Ti 2 o 5 )Nanowires. The titanium foil was calcined in a muffle furnace at 450 °C for 2 h to produce titanium dioxide (TiO 2 ) nanowires on a titanium sheet. Dissolve 3.27mL of aniline monomer in 40mL of deionized water, and then ultrasonically disperse to form a turbid liquid mixed with organic phase and water phase. Adjust the pH to 5 with 1mol / L hydrochloric acid, and slowly immerse the titanium sheet growing nanowires in a beaker. 0.8-1.2cm from the b...
Embodiment 2
[0035] Firstly, the titanium foil is ground and polished, then etched in etching solution (hydrofluoric acid, nitric acid, water volume ratio 2:5:5) for 20s, then ultrasonically cleaned three times in pure deionized water, and ultrasonically cleaned in pure acetone Wash three times. After rinsing with a large amount of water, place the titanium sheet in the lining of a 50mL reactor, and add 20mL of 1mol / L sodium hydroxide. Then the reaction kettle was placed in an oven at 200°C for 24 hours to generate titanic acid (H 2 Ti 2 o 5 )Nanowires. The titanium foil was calcined in a muffle furnace at 450 °C for 2 h to produce titanium dioxide (TiO 2 ) nanowires on a titanium sheet. Dissolve 3.27mL of aniline monomer in 40mL of deionized water, and then ultrasonically disperse to form a turbid liquid mixed with organic phase and water phase. Adjust the pH to 5 with 1mol / L hydrochloric acid, and slowly immerse the titanium sheet growing nanowires in a beaker. 0.8-1.2cm from the b...
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