Figure 2.

Optical and magnetic properties of the CFA fluorescent sensor. (a) Photos of the accumulation of the microspheres to magnetic bar under UV light, (b) Absorption (solid line) and photoluminescent (PL) (dash/dotted line) spectra of the CFA fluorescent sensor and AgInS₂/ZnS QDs in water (orange AgInS₂/ZnS QDs, red CaCO₃-Fe₃O₄ microspheres, and green CFA fluorescent sensor), (c) Confocal transmitted light images of the CFA microspheres, (d) Fluorescence-Lifetime Imaging Microscopy (FLIM) images of the CFA microspheres, (e) PL decay curves of the CFA microspheres and the aqueous dispersion of the initial AgInS₂/ZnS QDs. The PL measurements shown in panels (b−e) were done at 350 nm excitation.