Preparation method for silver nanocubes

The invention relates to a preparation method for silver nanocubes. The silver nanocubes different in side length are prepared by adopting a seed growing method. The preparation method for the silver nanocubes comprises the following steps: firstly, preparing silver cube seeds of which the mean side length is 35nm by adopting ethylene glycol as solvent and a reducing agent, PVP (polyvinyl pyrrolidone) as a stabilizer, silver trifluoroacetate as a silver source and hydrochloric acid and soluble sulphurizing salt as adjuvants; then, preparing the silver nanocubes of which the mean side length is 40-160nm by adopting the ethylene glycol as the solvent and the reducing agent, the PVP as the stabilizer and soluble silver salt as the silver source by controlling the relative usage of the seeds and the silver salt. The method provided by the invention has the advantages that the operation is simple, the process is controllable, the obtained silver nanocubes are high in stability, and the silver nanocubes can be efficiently synthetized, and therefore, the preparation method for the silver nanocubes is broad in market prospect.