Fig. 1

(A) Schematic illustration of the preparation of the Eu@DMSNs/Pec. (B) TEM images of DMSNs-1, DMSNs-2, DMSNs-3 and Eu@DMSN3/Pec. (C) Particle size distribution of (c1) DMSNs-1, (c2) DMSNs-2, (c3) DMSNs-3 and (c4) Eu@DMSNs3/Pec. (D) N2 adsorption/desorption isotherms curve of (d1) DMSNs-1, (d2) DMSNs-2, (d3) DMSNs-3 and (d4) Eu@DMSNs3/Pec (DMSNs3 was pretreated by HCl). (E) Thermogravimetric curve of (e1) Eu@DMSNs-1/Pec, (e2) Eu@DMSNs-2/Pec, (e3) Eu@DMSNs-3/Pec and (e4) Eu@DMSNs3/Pec (DMSNs3 was pretreated by HCl)