Highly fluorescent silver nanofluids with ferroelectric molecules

摘要

Highly fluorescent silver nanoparticles (Ag-NPs), soluble in a ferroelectric host of polymer molecules such as poly(vinylidene fluoride) (PVF₂), have been created in the form of nanofluids. The content of Ag-NPs (flocculates) is varied in steps 0.1-0.2 wt% up to a value of 5.0 wt% in tailoring a broad green emission band over 520-620 nm out of a hybrid percolation Ag-PVF₂ composite. A maximum intensity arises in this band at as small a percolation threshold as 0.1 wt% Ag-NPs. It contains three distinct bands of peak values 541, 565, and 582 nm in an Ag-NPs tunable response of the localized surface plasmons. The emission-dependent anti-Stokes excitation spectrum contains a similar group of three bands 348, 401, and 421 nm. For Ag-contents above 0.1 wt%, interdependent intensities in the emission and excitation bands drop rapidly by as much as five times, conferring a metal-polymer percolation network. The results open wide applications for biological labels and light emitters using such nanofluids.View full textDownload full textKeywordslight emission in nanofluid, biological fluids, nanofluids, hybrid composites, nanostructures, rheological properties, optical propertiesRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/09500839.2010.486756