Figure 2 | Scientific Reports

Figure 2

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

Figure 2

Morphology, optical property and sensing property of EuCP microspheres.

(a) SEM and STEM (inset) images of europium(III) coordination polymer (EuCP) microspheres (0.70 ± 0.06 µm, s.d., n = 100). (b) EDX spectrum and (c) confocal microscopy and OM (top inset) images of EuCP microspheres. Bottom inset in (c) shows EuCP microspheres dispersed in MeCN. (d) Luminescent titration spectra of EuCP microspheres with the addition of various concentrations of Cu(NO3)2 in MeCN with an excitation wavelength of 280 nm. Inset in (d) shows the EuCP microspheres suspension before and after immersion in a Cu2+ solution with UV irradiation. (e) Luminescent intensity changes of EuCP microspheres after immersion in various metal ion solutions (5 mM). (f) Photograph of a series of EuCP microspheres suspensions before and after immersion in various metal ion solutions in the presence of UV irradiation.

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