Substrate effects on the luminescence of quantum dots encapsulated into the ultrathin polymer LbL film

PMSE 108

Dmitry Zimnitsky, dmitry@gatech.edu1, Jun Xu, 515-294-99672, Zhiqun Lin, zqlin@iastate.edu2, and Vladimir V. Tsukruk1. (1) School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, GA 30332, (2) Department of Materials Science and Engineering, Iowa State University, 3161 Gilman Hall, Ames, IA 50011
The photoluminescence of CdSe/ZnS quantum dots (QD) at solid surfaces (glass, silicon, PDMS, and metals) considered for three types of organization: QD directly adsorbed on solid surfaces, QD separated from the solid surface by a nanoscale polymer film with different thickness, and QD encapsulated into a polymer film. The complete suppression of photoluminescence for QD on conductive metal surfaces (copper, gold) indicated a strong quenching effect. The photoluminescence intensity on other substrates (glass, silicon, and PDMS) linearly increases with placing the nanoscale (3-50 nm) polymer film between QD and the substrate. Photoluminescence increase is related to decrease of energy transfer between nanoparticles and surface as well as specific interactions with polymer matrix.
 

Synthesis and Self-Assembly Approaches to Polymer-Inorganic Hybrid Nanoparticles
1:30 PM-4:40 PM, Monday, April 7, 2008 Hilton New Orleans Riverside -- Grand Salon 24, Oral

Division of Polymeric Materials: Science & Engineering

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008