Preparation method and application of NiO-SnO2 composite material with flower-like structure
A composite material and flower-like structure technology, which is applied in the analysis of materials, material resistance, and material analysis through electromagnetic means, can solve the problems of improving gas-sensing performance, and achieve the effects of improving sensitivity, good crystallization, and good controllability
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Embodiment 1
[0037] (1) Preparation of SnO 2 flower structure material
[0038] Step 1: Weigh with a balance, 2.3 g stannous chloride and 5.9 g sodium citrate, dissolve it in the mixed solution prepared by 40 mL ethanol and 40 mL distilled water, stir magnetically at room temperature for 30 minutes until completely dissolved, and make water Thermally synthesized precursor solution.
[0039] Step 2: Transfer the precursor reaction solution prepared in Step 1 into a polytetrafluoroethylene-lined stainless steel autoclave with a filling degree of 80%, and seal it.
[0040] Step 3: Place the reaction kettle in Step 2 in an oven, keep it warm at 180° C. for 12 hours, and then cool it down.
[0041] Step 4: Centrifuge the reactant solution prepared in Step 3 to obtain a precipitate, and then wash it repeatedly with distilled water and absolute ethanol.
[0042] Step 5: Place the product of Step 4 in a drying oven at a constant temperature, dry at 60°C for 24 hours, and cool down after drying. ...
Embodiment 2
[0048] (1) Preparation of 1%NiO-SnO 2 flower structure composite
[0049] Step 1: 2.3 g of stannous chloride, 0.02 g of nickel nitrate, and 5.9 g of sodium citrate were dissolved in a mixed solution of 40 mL of ethanol and 40 mL of distilled water, stirred magnetically at room temperature for 30 minutes until completely dissolved, and prepared as Hydrothermal synthesis of precursor reaction solution.
[0050] Steps 2, 3, 4, 5 and 6 are the same as in Example 1.
[0051] (2) 1%NiO-SnO 2 Structural characterization of flower-like structure composites
[0052] The crystal structure of the product was characterized by XRD powder diffractometer (XRD, PANalytical X’Pert Pro). from figure 1 It can be seen that in the sample except monoclinic SnO 2 Except for the peak of NiO, there is no diffraction peak of NiO, which may be due to the relatively low content of NiO and the small size of NiO particles. The diffraction characteristic peaks are all sharp, and no other miscellaneou...
Embodiment 3
[0054] (1) Preparation of 3%NiO-SnO 2 flower structure composite
[0055] Step 1: Dissolve 2.3 g of stannous chloride, 0.07 g of nickel nitrate, and 5.9 g of sodium citrate in a mixed solution of 40 mL of ethanol and 40 mL of distilled water, stir magnetically at room temperature for 30 minutes until completely dissolved, and prepare water Thermally synthesized precursor reaction solution.
[0056] Steps 2, 3, 4, 5 and 6 are the same as in Example 1.
[0057] (2) 3%NiO-SnO 2 Structural characterization of flower-like structure composites
[0058] The crystal structure of the product was characterized by XRD powder diffractometer (XRD, PANalytical X’Pert Pro). from figure 1 It can be seen that in the sample except monoclinic SnO 2 Except for the peak of NiO, there is no diffraction peak of NiO, which may be due to the relatively low content of NiO and the relatively small particle size. The diffraction characteristic peaks are all sharp, and no other miscellaneous peaks ...
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