The invention discloses a water phase preparation method of a spherical
silver nanoparticle with adjustable size, which comprises the following steps of: 10, preparing a silver seed solution : 101, mixing deionized water with a
sodium citrate solution, and obtaining a stabilizer solution after stirring; 102, heating the stabilizer solution to the temperature of water bath, adding an AgNO3 solution, and then adding a NaHB4 solution; and 103, utilizing the deionized water to obtain a constant volume after cooling at
room temperature, and obtaining the silver seed solution; 20, preparing the spherical
silver nanoparticle: 201, adding deionized water to a flask, then adding
sodium citrate solution to obtain a
reducer solution, and heating the
reducer solution to a boiling state; 202, adding the silver seed solution to the
reducer solution, and then adding the AgNO3 solution; and 203, cooling at
room temperature to obtain the spherical
silver nanoparticle. The preparation method can be used for preparing the spherical silver
nanoparticle with favorable monodispersity, and the size of the spherical silver
nanoparticle can be adjusted.