Preparation method of gas sensor used for detection of isoprene gas
A gas sensor and gas detection technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of lack of research on the gas-sensing performance of Isoprene gas, and achieve the effect of simple and reliable preparation method
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[0025] A preparation method for a gas sensor for isoprene gas detection, comprising the following steps:
[0026] 1) Mix 1-4mL hydrochloric acid solution (concentration: 36wt%-38wt%) and 2-6mL tetrabutyl titanate at a mass ratio of 1-4:2-6, and add equivalent titanic acid Tetrabutyl ester 5-10:1 oleic acid solution 20-50mL, stirred with a magnetic stirrer at room temperature for 15min, moved the obtained solution into a high-temperature reactor for hydrothermal reaction, and reacted at 140-180°C for 4-12h; After the furnace is cooled, it is washed repeatedly with ethanol and deionized water for 5 times, dried at 80°C for 12 hours in the air, and then annealed at 500°C for 2 hours to obtain "dandelion" nano-TiO 2 powder;
[0027] 2) with the TiO obtained in step 1) 2 The powder is mixed with an organic solvent (ethanol, glycerol or ethylene glycol diluted with deionized water at a mass ratio of 1:1) according to a mass ratio of 1:5 to 20, and ultrasonically mixed evenly to ob...
Embodiment 1
[0036] Measure 2 mL of HCl solution with a mass fraction of 36 wt % and place it in a 50 mL beaker, weigh 4 mL of tetrabutyl titanate and add it dropwise to the HCl solution, mix well, slowly add 20 mL of oleic acid solution to the mixed solution, and Use a magnetic stirrer to stir at room temperature for 15 minutes, called the precursor solution. Transfer the precursor solution into a 50mL Teflon reactor for hydrothermal reaction. The temperature and time of the hydrothermal reaction are 160°C and 5h, respectively. Drying at 80°C for 12h in air, followed by annealing at 500°C for 2h in air to obtain nano-TiO 2White powder.
[0037] The white nano-powder grown in this embodiment is characterized by SEM, and it can be found that the powder is a "dandelion" microsphere structure with a diameter of about 3.4 μm, and the diameter of the nanorods forming the microsphere is about 45-80 nm (such as figure 1 As shown in (a) and (b), one of the biggest advantages of the "dandelion"-l...
Embodiment 2
[0043] Measure 4mL of HCl solution with a mass fraction of 37.5wt% and place it in a 100mL beaker, weigh 6mL of tetrabutyl titanate and add it dropwise to the HCl solution, mix well, and slowly add 40mL of oleic acid solution to the mixed solution, Use a magnetic stirrer to stir at room temperature for 15 minutes, called the precursor solution. Move the precursor solution into a Teflon reactor for hydrothermal reaction. The temperature and time of the hydrothermal reaction are 140°C and 12h, respectively. After cooling with the furnace, wash it repeatedly with ethanol solution and deionized water for 5 times, and then place it in the air. Drying at 80°C for 12h, followed by annealing at 500°C for 2h in air to obtain nano-TiO 2 White powder.
[0044] The nano-TiO prepared in this embodiment 2 The powder is used as a sensitive material to prepare a gas sensor, which specifically includes the following steps:
[0045] Mix ethylene glycol and deionized water at a ratio of 1:1, ...
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