Figure 1.

TEM image of SiO2 sphere (A), HRTEM image of SiO2∙Eu2O3 HSs (B), XRD patterns of SiO2 sphere and SiO2∙Eu2O3 HSs (C). The insert is magnification of one segment of XRD.

Li et al. Nanoscale Research Letters 2013 8:435   doi:10.1186/1556-276X-8-435
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