Carbon-protected magnetic nanoparticles exhibit long-term stability in acid or alkaline medium, good biocompatibility, and high saturation magnetization. As a result, they hold great promise for magnetic resonance imaging, photothermal therapy, etc. However, since pyrolysis, which is often required to convert the carbon precursors to carbon, typically leads to coalescence of the nanoparticles, the obtained carbon-protected magnetic nanoparticles are usually sintered as a non-dispersible aggregation. We have successfully synthesized discrete, dispersible, and uniform carbon-protected magnetic nanoparticles via a precise surface/interface nano-engineering approach. Remarkably, the nanoparticles possess excellent water-dispersibility, biocompatibility, a high T (2) relaxivity coefficient (384 mM(-1)center dot s(-1)), and a high photothermal heating effect. Furthermore, they can be used as multifunctional core components suited for future extended investigation in early diagnosis, detection and therapy, catalysis, separation, and magnetism

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In this work, spindle-like micrometre SrMoO 4 :Ln 3+ (Tb, Eu) phosphors have been synthesized and designed as a fluorescent sensor for Fe 3+ ions assay. The structural information, morphologies and luminescence properties of the samples were characterized by X-ray diffraction, Fourier-transform infrared, Raman analysis, field-emission scanning electron microscopy and photoluminescence patterns. Furthermore, Fe 3+ ions could be immediately detected using fluorescence quenching methods, and this method shows excellent and satisfying sensitivity. This facile method could be extended to environmental and biological applications.

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