Figure 1

(a) XRD patterns of the samples synthesized with a varied fraction of CPTES in the silane mixture (fC). (b and c) Typical SEM and TEM images of the sample with fC=10%. a.u., arbitrary unit; CPTES, chloropropyltriethoxysilane; SEM, scanning electron microscope; TEM, transmission electron microscope; XRD, X-ray diffraction.