Fig. 1From: Au–Ag assembled on silica nanoprobes for visual semiquantitative detection of prostate-specific antigenSynthesis of SiO2@Au–Ag NPs. a Synthesis procedure for SiO2@Au–Ag NPs. b Transmission electron microscopy (TEM) images of (i) SiO2 NPs, (ii) SiO2@Au NPs, and (iii) SiO2@Au–Ag NPs. c EDX mapping showing each component of SiO2@Au–Ag NPs, including (i) Si atoms, (ii) Au atoms, and (iii) Ag atoms. (iv) Overlay image of all elementsBack to article page