Silver/gold nanometer cavity dendritic crystal containing interior label molecule, preparation method and application thereof

The invention relates to a silver/gold nanometer cavity dendritic crystal containing an interior label molecule, a preparation method and an application thereof. The preparation steps are as follows: alternately ultrasonic washing a copper simple substance with ethyl alcohol and pure water for 3-5 times, and then blowing with a nitrogen flow, putting into a beaker for later use; adding excessive silver nitrate solution, stirring, reacting and ageing; centrifugally cleaning the reaction products and ultrasonically dispersing in a PVP solution; adding the interior label molecule containing nitrogen and sulfur atoms; performing oscillatory reaction, thereby acquiring a silver dendritic crystal with a micro-nano structure; centrifugally cleaning and then re-dispersing in the PVP solution; adding aqueous alkali for regulating pH; and lastly, adding into a growth solution and reacting, thereby acquiring the silver/gold nanometer cavity dendritic crystal containing an interior label molecule. The preparation of the