Figure 3 | Scientific Reports

Figure 3

From: Highly effective heterogeneous chemosensors of luminescent silica@coordination polymer core-shell micro-structures for metal ion sensing

Figure 3

Morphology, optical property and sensing property of silica@EuCP microspheres.

(a) SEM and (b) STEM images of silica@EuCP microspheres (1.10 ± 0.03 µm). SEM image of initial silica (0.87 ± 0.02 µm) are shown in insets of (a) (s.d., n = 100). (c) EDX spectrum, (d) EDX spectrum profile scanning and (e) confocal microscopy and OM (inset) images of silica@EuCP microspheres. (f) Luminescent titration spectra of silica@EuCP microspheres with the addition of various concentrations of Cu(NO3)2 in MeCN with an excitation wavelength of 280 nm. (g) Luminescent intensity changes of silica@EuCP microspheres after immersion in various metal ion solutions (5 mM). (h) Photograph of a series of silica@EuCP microspheres suspensions before and after immersion in various metal ion solutions in the presence of UV irradiation.

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