Compared with traditional high-temp

Compared with traditional high-temperature heating or high-frequency induction reaction methods, the morphology of nanomaterials prepared using constant temperature heat conduction method is more stable, and the reaction temperature is easier to control, which is conducive to changing the morphology of nanomaterials and providing excellent reaction conditions for the preparation of nanomaterials. The hydrothermal method is used to prepare nano ZnO. 0.735g of ZnNO3.6H2O powder and 1.08g of hexamethylenetetramine powder are respectively placed in beakers, and 25ml of deionized water is slowly added while using a glass rod to stir and dissolve until the powder particles in the solution completely disappear. Then, the two solutions are mixed in an ultrasonic cleaning machine for 30 minutes to mix the two solutions evenly. The uniform mixed solution is then transferred to a high-pressure vessel lined with polytetrafluoroethylene, After raising the temperature of the muffle furnace to 95 ℃, the non high-pressure kettle is transferred to the muffle furnace for reaction for 5 hours. The cooled powder is washed three times with deionized water to obtain nano ZnO powder. The preparation process is shown in Figure 2 (a); Using a one-step hydrothermal method to prepare CuO, 10ml 1.00mol/L of copper nitrate solution was added to the prepared 10mL 1.00mol/L of sodium hydroxide solution. 2g of hexamethylene tetramine powder was taken and added to the above mixed solution while stirring. 15mL of ethanol solution was added to the above solution, and then the mixed solution was treated with ultrasound for 15 minutes to fully dissolve in the aqueous solution. It was transferred to a high-pressure vessel and reacted for 12 hours at 120 ℃, Remove the reaction solution from the high-pressure reactor, separate it using a centrifuge, centrifuge it three times with distilled water, and dry to obtain CuO black powder. The preparation process is shown in Figure 2 (b); In order to better control the growth of nano ZnO in nano CuO, we need to further hydrothermal the two prepared nanomaterials. By controlling the hydrothermal time, the two materials are embedded together, and The experimental operation steps are shown in the figure