A preparation method of flower-shaped cuo microspheres and its application in formaldehyde gas sensor
A microsphere and flower-like technology, which is applied in the field of CuO microsphere preparation, can solve the problems of large-scale application and expensive detection equipment, and achieve good response-recovery characteristics and selectivity, good crystallization, and broad application prospects.
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[0033] (1) The preparation method of the flower-shaped CuO microspheres comprises the following steps:
[0034] Step 1: A certain amount of Cu(NO 3 ) 2 •3H 2 O, urea, and PEG20000 were dissolved in 80 mL of deionized water. Stir magnetically at room temperature for 30 minutes, and prepare a hydrothermal synthesis precursor reaction solution.
[0035] 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. Keep the temperature at 120-200°C for 12 hours, then cool down to room temperature with the furnace to obtain the reaction product.
[0036] Step 3: The reaction product obtained in Step 2 is centrifuged, washed repeatedly with distilled water and absolute ethanol, and then dried.
[0037] Step 4: Put the dried product in Step 3 into a muffle furnace and calcinate at 400° C. for 3 hours to obtain flower-shaped CuO microspheres.
[0038] (2) The steps of p...
Embodiment 1
[0044] (1) Preparation of flower-like CuO microspheres:
[0045] Step 1: 0.483 g Cu(NO 3 ) 2 ·3H 2 O, 0.36 g of urea, and 1.784 g of PEG20000 were dissolved in 80 mL of deionized water, and magnetically stirred at room temperature for 30 minutes to prepare a reaction solution of the precursor for hydrothermal synthesis.
[0046] 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.
[0047] 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.
[0048] Step 4: Centrifuge the reactant solution prepared in Step 3 to obtain a black precipitate, which is then repeatedly washed with distilled water and absolute ethanol.
[0049] Step 5: Place the product of Step 4 in a drying oven at a constant temperature at 80° C. for 24 hours for drying.
[0050] Step 6: Put the dried product in step 5 into a c...
Embodiment 2
[0055] (1) Preparation of flower-like CuO microspheres:
[0056] Step one, two are with embodiment 1.
[0057] Step 3: Place the reaction kettle in Step 2 in an oven, keep it warm at 120° C. for 12 hours, and then cool it down.
[0058] Steps 4, 5 and 6 are the same as in Example 1.
[0059] (2) Structural characterization of flower-like CuO microspheres
[0060] The morphology of the product was characterized by scanning electron microscopy. Such as image 3 As shown in (a), the product is a bulk material composed of nanoblocks.
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