Fig. 1From: Synthesis of europium-doped VSOP, customized enhancer solution and improved microscopy fluorescence methodology for unambiguous histological detectionTransmission electron microscopy (TEM) images show monocore structure and mean iron core sizes of approx. 5–7 nm for VSOP (a), Eu-VSOP-4 (b), and Eu-VSOP-7(c). Selected areas of electron diffraction (SAED) pattern (d–f) confirms the magnetite/maghemite structure and percentage of IONP as distributed by size (g–i). Scale bar a–c: 20 nm; scale bar d–f: 2 nm−1 Back to article page