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In this work we demonstrate the possibility of obtaining a significant increase of the photoluminescence of colloidal semiconductor nanocrystals (NCs) by means of metallic nanopatterns. Highly ordered triangular-shaped gold nanopatterns (typical dimensions 200 nm) were fabricated on planar substrates by electron beam lithography (EBL). Colloidal semiconductor nanocrystals (core/shell CdSe/ZnS quantum dots or CdSe nanorods) dispersed in a polymer matrix (PMMA) were subsequently deposited on the substrates by spin-coating. The coupling between the surface plasmons (SPs) resonance band of the metallic nanostructures and the excitation/emission bands of the nanocrystals resulted in a strong enhancement of the fluorescence from the quantum emitters, as probed by confocal microscopy analyses. Importantly, the proposed approach allows a precise control of the shape and dimensions of the single …
Publication date: 
20 Sep 2007

PP Pompa, L Martiradonna, A Della Torre, L Carbone, LL Del Mercato, L Manna, M De Vittorio, F Calabi, R Cingolani, R Rinaldi

Biblio References: 
Volume: 126 Issue: 1 Pages: 187-192
Sensors and Actuators B: Chemical