First metal or metal oxide or second metal ultra-small nanoparticle loaded silicon dioxide and preparation method thereof

The invention discloses first metal or metal oxide or second metal ultra-small nano particle loaded silicon dioxide and a preparation method thereof, and the preparation method of the first metal or metal oxide ultra-small nano particle loaded silicon dioxide comprises the following steps: 1) dissolving a first silane coupling agent and a second silane coupling agent; silicon in the first silane coupling agent is connected with a first group, silicon in the second silane coupling agent is connected with a second group, then adding silicon dioxide, and reacting to obtain first functional silicon dioxide; 2) adding into a metal precursor solution, enabling the first group to interact with a metal precursor, and enabling the second group not to interact with the metal precursor, so as to obtain second functional silicon dioxide; and 3) roasting to obtain the target product. According to the invention, the interaction between precursor metal ions and between the metal ions and the carrier can be controlled, the a