This alsowas confirmed by UV/VIS spectra
discussed below. The TEM and TEM-EDX images Fig. 4(g & i) and
(h & j) of ZnO@mSiO2–SH and ZnO@mSiO2–NH2 NPs, respectively
showed ZnO core bare covered with distinguishable meso silica layer,
13 nm in thickness covered by thin layer of functionalized thiol-silane
precursor layer, 5 nm in thickness resulting from the condensation of
thiol-silane over the meso silica layer