▎ 摘　　要

NOVELTY - Preparing graphene oxide-coated up-conversion fluorescent natural silk involves preparing terminal amino hyperbranched polymer modified NaYF4:Ytterbium, Erbium/Thulium and terminal hydroxyl hyperbranched polymer modification NaYF4:Ytterbium, Erbium/Thulium into 0.1-5g/L of aqueous solution, then soaking silk fabric at 80 degrees C of in aqueous solution for 10-60 minutes. The bath ratio is 1:10. The silk fabric is repeatedly washed by deionized water, dried, then immersed the silk fabric at 80 degrees C of in aqueous solution for 10-60 minutes. The bath ratio is 1:10. USE - Method for preparing graphene oxide-coated up-conversion fluorescent natural silk (claimed). ADVANTAGE - The method enables to prepare graphene oxide-coated up-conversion fluorescent natural silk that has excellent up-conversion fluorescent property and good resistance to washing and wear, avoids the use of chemical cross-linking agent, and reduces the influence of the silk fabric strength. DETAILED DESCRIPTION - Preparing graphene oxide-coated up-conversion fluorescent natural silk involves preparing terminal amino hyperbranched polymer modified NaYF4:Ytterbium, Erbium/Thulium and terminal hydroxyl hyperbranched polymer modification NaYF4:Ytterbium, Erbium/Thulium into 0.1-5g/L of aqueous solution, then soaking silk fabric at 80 degrees C of in aqueous solution for 10-60 minutes. The bath ratio is 1:10. The silk fabric is repeatedly washed by deionized water, dried, then immersed the silk fabric at 80 degrees C of in aqueous solution for 10-60 minutes. The bath ratio is 1:10. The silk fabric is repeatedly washed by deionized water, and dried. The layer of NaYF4:Ytterbium, Erbium/Thulium is finished to surface of silk fabric, then terminal hydroxyl hyperbranched polymer modified NaYF4:Ytterbium, Erbium/Thulium and terminal amino hyper-branched polymer modified NaYF4:Ytterbium, Erbium/Thulium is placed in finishing liquid. The silk fabric is determined by number of layer of surface NaYF4:Ytterbium, Erbium/Thulium. The silk fabric is dipped at 80 degrees C in 1-10g/L of oxidized graphene aqueous solution for 10-60 minutes. The bath ratio is 1:50. The finishing product is repeatedly washed by ethanol and de-ionized water, and dried to obtain graphene oxide coated up-conversion fluorescent natural silk.