Fig. 4From: Core–shell structured gold nanoparticles as carrier for 166Dy/166Ho in vivo generatorCharacterization of DyPtAuNPs. a–c Representative TEM image of samples with different Dy:Au feeding ratios: Dy:Au = 1:3 (a), 1:10 (b) and no Dy addition (c). Scale bar is 50 nm. See supporting information for size distribution histograms (Additional file 1: Fig. S2). d UV–vis spectrum of the DyPtAuNPsBack to article page