11 Synthesis, Characterization, and Applications of DendrimerEncapsulated Metal and Semiconductor Nanoparticles Richard M. Crooks, Victor Chechik*, Buford I. Lemon III†, Li Sun, Lee K. Yeung‡, and Mingqi Zhao§ Texas A&M University, College Station, Texas
I. OVERVIEW In this chapter we discuss a novel template-based strategy for preparing metal and semiconductor nanoparticles (Fig. 1). This approach is unique in that discrete polymers, known as dendrimers (1–5), are used as the templates rather than the more well-established approaches of using less-well-defined random polymers (6–15) or monolithic metal, ceramic, or polymers as templates (16–20). As we will show, dendrimers are particularly well suited for hosting metal particles for the following reasons: (a) they can act as both template and stabilizer for the nanoparticle; (b) they act as selective gates that control access of small molecules to the encapsulated nanoparticle after it is synthesized; (c) the terminal groups can be tailored to enhance solubility and as handles for facilitating surface immobilization.
* Current Affiliation: University of York, Heslington, York, U.K. † Current Affiliation: Dow Chemical Co., Midland, Michigan ‡ Current Affiliation: Dow Chemical Co., Freeport, Texas § Current Affiliation: ACLARA Bio Sciences, Inc., Mountain View, California
Chemistry of metal nanoparticles