How to modify nano-materials with fluorescent dyes

Manganese dioxide nanoparticles have the ability to quench the fluorescence of carbon nanodots, and the quenching efficiency is 0.4 1~0.72 at pH 4~7. The patented technical method of the invention prepares manganese dioxide nanoparticles by simply mixing bovine serum albumin solution and potassium permanganate solution, thus avoiding the use of complex instruments and equipment, and not requiring harsh conditions such as high temperature, high pressure and strong alkalinity, and having the advantages of simple operation, rapid reaction, environmental protection and energy saving, and simplicity and feasibility.