MPS‐Modified Silica Nanoparticles Linked with Cd²⁺ Ions

Silica nanoparticles were linked by using 3‐mercaptopropyltrimethoxysilane (MPS) as a coupling agent and Cd²⁺ as bridging ions. The TEM micrographs showed approximately linear linkage between the silica nanoparticles rather than dense packing. The UV‐visible absorption spectra confirmed the formation of S‐Cd‐S bonds between the silica nanoparticles. The alternative films of MPS‐modified SiO₂ nanoparticles and Cd²⁺ ions were also prepared using the layer‐by‐layer self‐assembly technique and characterized by AFM.

Keywords:

• Silica nanoparticles
• MPS modifying
• cadmium ions
• linkage

Acknowledgments

This work was financially supported by Excellent Young Teacher Program and Research Foundation of Returned Student Abroad, MOE of China. The authors also thank Shanghai Education Committee for support.