Preparation of Functional Nanoporous Silica for Encapsulation of CdSe Nanoparticles


  • Financial support from the Korea Science and Engineering Foundation through the Hyperstructured Organic Materials Research Center is gratefully acknowledged. T. E. acknowledges the support of a CAREER Award from the National Science Foundation (CHE-0239486), a gift from the Eastman Kodak Company, and facilities support from the NSF-sponsored Materials Research Science and Engineering Center (MRSEC) at UMass Amherst (DMR-0213695).


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Nanoporous silica–quantum dot composites are produced using an amphiphilic organotrialkoxysilane containing a thermally reversible urethane moiety. Nanoporous silica is formed by co-condensation of the amphiphile and a silicate precursor (see Figure). After heating, the urethane dissociates to form an isocyanate group tethered to the silica. This can be used to make thiol-functionalized nanoporous silica that can encapsulate cadmium selenide nanoparticles.