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. Author manuscript; available in PMC: 2012 Nov 17.
Published in final edited form as: J Phys Chem Lett. 2011 Nov 17;2(22):2934–2944. doi: 10.1021/jz201147g

Figure 11.

Figure 11

(a) SEM image showing an overview of the composite film of mesoporous silica spheres in a mesoporous silica framework (from ref. 90). (b) Cross-sectional SEM of the composite film. (c) SEM showing the composite structure of spheres within the silica matrix. (d) TEM revealing the mesoporous structure in the silica matrix used to embed the spheres. (e) UV-vis absorption spectra of the composite exposed to solutions containing the indicated concentrations of Cd2+ ions. The insets show digital photographs of the sensing materials as synthesized (left) and in a 20 ppb Cd2+ solution (right).