A method for preparing a meso crystal of silver oxide containing silver peroxide is provided. A quantum crystal of silver thiosulfate complex on a substrate or a particle made of copper metal or copper alloy is subjected to treating by an alkaline aqueous solution containing halogen ion to obtain a meso crystal of silver oxide containing the silver peroxide. The meso crystal of silver oxide having nanometer scale, containing a silver peroxide, the silver oxide nanocrystal being a superstructure three-dimensionally arranged in the shape of a neuron provided with properties being negatively charged in water and able to be reduced to a silver nanoparticle by a laser radiation.
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