The present application discloses a composite and its preparation method and application. The composite includes silica-coated quantum dots and graphene nanosheets on the surface of the silica-coated quantum dots; wherein the silica-coated quantum dots include quantum dots and silica layer coated on the surface of the quantum dots. And the graphene nanosheets and the silica layer is bonded by (O—)3Si—R1—NHCO—R3—CONH—R2—Si(O—)3 or (O—)3Si—R4—SCH2CH2—R5—Si(O—)3, R1, R2, R4, R5 are respectively selected from a group consisting of a hydrocarbyl or a hydrocarbyl derivative, R3 is selected from a hydrocarbyl, a hydrocarbyl derivative, an aryl or an aryl derivative. The composite can further improve the stability of quantum dots without affecting the inherent optical properties of quantum dots, thereby improving luminous efficiency.
本申请公开了一种复合材料及其制备方法和应用。该复合材料包括
硅包覆量子点和位于
硅包覆量子点表面的
石墨烯纳米片;其中,
硅包覆量子点包括量子点和包覆在量子点表面的
二氧化硅层。而
石墨烯纳米片和
二氧化硅层通过(O-)3Si-R1-NHCO-R3-CONH-R2-Si(O-)3或(O-)3Si-R4-SCH2CH2-R5-Si(O-)3键合,R1、R2、R4、R5分别选自烃基或烃基衍
生物组成的组,R3选自烃基、烃基衍
生物、芳基或芳基衍
生物。该复合材料可以在不影响量子点固有光学特性的前提下,进一步提高量子点的稳定性,从而提高发光效率。