Mesoporous polycrystalline zno nanosheets and its preparation method and application
A nanosheet and mesoporous technology, applied in the field of mesoporous polycrystalline ZnO nanosheet and its preparation, can solve the problems of sensitivity, response-recovery time and selectivity to be improved, and achieve excellent selectivity, high purity and low cost Effect
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[0050] The preparation method of the following gas sensor is as follows:
[0051] According to the mass ratio of 1:1, take mesoporous polycrystalline ZnO nanosheets and Triton X-100, fully mix them in a small agate mortar, and grind them into a paste-like slurry. Then, an appropriate amount of slurry is uniformly coated on the outer surface of the alumina ceramic tube core to form a sensitive layer, and the thickness of the sensitive layer is 50-100 μm. A gold electrode and two platinum wires are pre-printed on each side of the alumina ceramic die ends. Afterwards, the coated alumina ceramic core was sintered in a muffle furnace at 350 °C for 1 h to remove the organic binder and increase the mechanical strength of the sensitive layer. Finally, a Ni-Cr heating wire is inserted into the alumina ceramic tube core, and the two ends of the heating wire and the four platinum wires on the alumina ceramic tube core are welded to the hexagonal base to assemble a side-heating sintering...
Embodiment 1
[0063] A preparation method of mesoporous polycrystalline ZnO nanosheets, comprising the following steps:
[0064] Step 1, under the condition of magnetic stirring, solution A is added dropwise to solution B to obtain a milky white suspension, solution A is added dropwise to solution B and then stirred for 5 minutes, wherein, solution A is added dropwise to solution B The dropping rate is 2mL / min,
[0065] The preparation method of solution A is to add 5.95 g of zinc nitrate hexahydrate into 20 mL of deionized water, and magnetically stir for 5 minutes until completely dissolved to obtain solution A, wherein the concentration of zinc nitrate hexahydrate in solution A is 1 mol / L;
[0066] The preparation method of solution B is to add 1.92g of ammonium carbonate into 20mL of deionized water, and magnetically stir for 5 minutes until completely dissolved to obtain solution B, wherein the concentration of ammonium carbonate in solution B is 1mol / L;
[0067] Step 2, place the mil...
Embodiment 2
[0093] A preparation method of mesoporous polycrystalline ZnO nanosheets, comprising the following steps:
[0094] Step 1, under the condition of magnetic stirring, solution A is added dropwise to solution B to obtain a milky white suspension, solution A is added dropwise to solution B and then stirred for 5 minutes, wherein, solution A is added dropwise to solution B The dropping rate is 1mL / min,
[0095] The preparation method of solution A is to add 0.60 g of zinc nitrate hexahydrate into 20 mL of deionized water, stir magnetically for 5 minutes until completely dissolved, and obtain solution A, wherein the concentration of zinc nitrate hexahydrate in solution A is 0.1 mol / L;
[0096] The preparation method of solution B is to add 0.20 g of ammonium carbonate into 20 mL of deionized water, stir magnetically for 5 minutes until it is completely dissolved, and obtain solution B, wherein the concentration of ammonium carbonate in solution B is 0.1 mol / L;
[0097] Step 2, plac...
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