Hollow spheres of SnO2 were synthesized by a facile one-step hydrothermal synthesis route. The synthesis method was described as follows: 0.190 g of SnCl4·6H2O was dissolved in a mixture of deionized water and ethanol with the volume ratio of 1:10 followed by the addition of 0.5 mL of concentrated hydrochloric acid (mass fraction 36.5–38%) into the solution. Then the solution was ultrasonicated for 30 min for the purpose of getting a homogeneous mixture solution. After that, the final solution was transferred into a Teflon-lined stainless steel autoclave (45 mL volume) and kept at a constant temperature of 200 °C for 24 h. Then the solution temperature was decreased to room temperature naturally. The obtained white precipitate was washed alternatively with deionized water and ethanol several times by centrifugation to remove the impurity ions, and it was finally dried in vacuum at 80 °C for 12 h and calcined at 400 °C for 2 h.
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(2025-6-4)