Lanthanum-doped formaldehyde-sensitive material and preparation method thereof, and formaldehyde sensor
A formaldehyde sensor and sensitive material technology, which is applied in the field of lanthanum-doped photocatalytic formaldehyde-sensitive materials and its preparation, can solve the problems that the lower limit detection standard of indoor formaldehyde cannot be met, it is not suitable for large-scale production, and the preparation process is complicated. The effect of simple emission and preparation method and simple process flow
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[0030] figure 1 It is a flow chart of the steps of the synthesis method of the photocatalytic formaldehyde-sensitive material of the present invention, comprising the following steps:
[0031] 1. Mix the pre-synthesized zinc oxide nanoparticles with lanthanum salt and add alcohol solution to dissolve;
[0032] 2. Pour the solution into a ball mill tank and seal it, put it into a ball mill for ball milling, the ball milling time is 1-600min, and the ball milling speed is 10-1000rpm;
[0033] 3. Put the ball-milled solution into an oven to dry, the oven temperature is 60-100°C, and the time is 0.1-24h. The resulting substance is a formaldehyde-sensitive material;
[0034] 4. Coating the resulting material onto the interdigitated electrodes;
[0035] 5. Fix the ultraviolet light source at a distance of 1-10 mm directly above the interdigitated electrodes to obtain a formaldehyde sensor.
Embodiment 1
[0036] Example 1: Synthesis and testing of 1% lanthanum-doped formaldehyde sensitive material
[0037] Step 1: Synthesis of 1% lanthanum-doped formaldehyde sensitive material
[0038] 50g of zinc oxide nanomaterials were mixed with 0.2g of lanthanum nitrate (the molar ratio of lanthanum was 1%), and the mixture was dissolved in 20ml of absolute ethanol to form a solution, which was then poured into a ball ink tank and sealed. Ball milling was performed in a ball mill for 60 minutes at a milling speed of 800 rpm; the milled solution was dried in an oven at a temperature of 80° C. for 2 hours.
[0039] image 3 It is the powder diffraction pattern of the 1% lanthanum-doped sample of this embodiment. It can be seen that the main phase of the sample is ZnO, and there is a trace amount of lanthanum nitrate.
[0040] Step 2: Formaldehyde sensor preparation
[0041] The prepared formaldehyde-sensitive material was coated on the interdigitated electrodes by spraying. Fix an ultrav...
Embodiment 2
[0044] Embodiment 2: The response size of samples with different lanthanum doping ratios to 3ppm formaldehyde
[0045] figure 2 is the response of samples with different lanthanum doping ratios (the molar percentage of lanthanum is 0-5%) to the same concentration of formaldehyde (3ppm). It can be seen that the optimal ratio of lanthanum doping is 1%.
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