Controlled Release and Absorption Resonance of Fluorescent Silica‐Coated Platinum Nanoparticles

Aggregation‐driven seeded growth of uniform platinum nanoparticles and exclusive silica‐coating of the as‐grown platinum nanoparticles have been achieved successfully. Fluorescent Pt@SiO 2 nanoparticles have also been reproducibly prepared via effective co‐condensation of silanized dye molecules with tetraethylorthosilicate. The dye‐loaded Pt@SiO 2 nanoparticles have been exploited as model carriers for thermal‐responsive controlled release of guest molecules via slow hydrolysis/dissolution of silica shells; importantly, the encapsulated platinum cores have also been used as nanoprobes to simultaneously investigate their controlled release process. Meanwhile, unique size‐sensitive absorbance resonance in the dye‐loaded Pt@SiO 2 nanoparticles has been demonstrated for the first time, and it is expected to find novel application.