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Plasmonic Enhancement of NIR to UV Upconversion by a Nanoengineered Interface Consisting of NaYF4:Yb,Tm Nanoparticles and a Gold Nanotriangle Array for Optical Detection of Vitamin B12 in Serum

Wiesholler, Lisa Marie ; Genslein, Christa ; Schroter, Alexandra ; Hirsch, Thomas



Abstract

A nanoengineered interface fabricated by self assembly enables the online determination of vitamin B12 via a simple luminescence readout in serum without any pretreatment. The interplay of Tm3+-doped NaYF4 nanoparticles (UCNPs) and a gold nanotriangle array prepared by nano sphere lithography on a glass slide is responsible for an efficient NIR to UV upconversion. Hot spots of the gold assembly ...

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