Substances Containing AuCs and Preparation Method and Use Thereof

A method for preparing an AuCs-containing substance, said method comprising the following steps:

• (1) dissolving HAuCl4 in a solvent to obtain a solution A with a 0.01˜0.03M concentration of HAuCl4;
• wherein the solvent is selected from the group consisting of methanol, water, ethanol, n-propanol and ethyl acetate;
• (2) dissolving ligand Y in a solvent to obtain a solution B with a 0.01˜0.18M concentration of the ligand Y;
• (3) mixing the solution A in step (1) with the solution B in step (2) to obtain a reaction solution, wherein the mole ratio of HAuCl4 and the ligand Y in the reaction solution is 1:(0.01˜100), wherein the reaction solution is stirred in an ice bath for 0.1˜48 h, wherein adding into the reaction solution 0.025˜0.8M solution of NaBH4 in a solvent selected from the group consisting of water, ethanol, and methanol, and wherein the reaction solution is stirred in an ice bath for 0.1˜12 h, wherein the mole ratio of NaBH4 and the ligand Y is 1:(0.01˜100);
• (4) centrifuging the reaction solution in step (3) at 8000˜17500 r/min for 10˜100 min, thereby precipitate of AuCs with different average particle sizes is obtained;
• (5) dissolving the precipitate of AuCs with different average particle sizes obtained in step (4) in water, wherein the dissolved precipitate of AuCs is put in a dialysis bag and is-dialyzed in water at room temperature for 1˜7 days;
• and
• (6) freeze-drying the AuCs solution in the dialysis bag for 12˜24 h, thereby the AuCs-containing substance is obtained.