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The invention belongs to the technical field of nanometer material synthesis, and particularly relates to a nanometer silver particle and a synthetic method thereof. The nanometer silver particle is in a spherical shape or a similar spherical shape, the surface of the nanometer silver particle is provided with a biomolecule wrapping layer, and biomolecules contain carboxyl groups with negative charge oxygen atoms. The nanometer silver particle is of a cubic crystal structure, and the particle diameter of the nanometer silver particle is 50 to 150nm. The nanometer silver particle is prepared by a biological material reduction method, orange juice and Ag<+> solution are uniformly mixed, the stirring is carried out at 26 to 34 DEG C, the centrifugal separation is carried out after the reaction completion, precipitates are washed and dried, and the nanometer silver particle is obtained. The biomolecules in the orange juice are used as templates, AgNO3 solution is utilized for providing silver ions, and the nanometer silver particle with the spherical appearance is synthesized through regulation and control. In fruit and vegetable juice such as orange juice, oxygen atoms on the groups such as carboxyl contained in biomolecules such as amino acid and vitamin mostly carry residual negative charges, the residual negative charges generate mutual effects with Ag<+>, nucleation sites are provided, and the generation of the nanometer silver particle is induced, regulated and controlled.

The invention belongs to the field of flexible FSS radar wave-absorbing structures, and more particularly to a flexible resistive film frequency selective surface, a preparation method and application thereof. The method comprises the steps of: printing a set frequency selective surface pattern on a photosensitive film, and attaching the photosensitive film to the surface of a flexible dielectric substrate; successively exposing and developing the photosensitive film on which the frequency selective surface pattern is printed in order to expose the frequency selective surface pattern on the surface of the flexible dielectric substrate; coating the surface of the developed flexible dielectric substrate with resistive conductive carbon paste, and sintering and curing the flexible dielectric substrate coated with the conductive carbon paste, wherein the cured conductive carbon paste is a resistive film; demolding the cured flexible dielectric substrate, removing the photosensitive film and the resistive film on the surface of the flexible dielectric substrate to obtain the flexible resistive film frequency selective surface. The FSS surface preparation method of the invention is simple, and can produce a large-area flexible passive resistive film frequency selective surface applied to a curved surface.