In order to determine the size of the larger Au@CloseLarge SPs, scanning electron microscopy (SEM) was employed. The SEM image and energy dispersive x-ray (EDX) map in Figure fi, reveals Au@CloseLarge SPs of 2 µm to 4 µm in size. X-ray diffraction (XRD) pattern (Figure ) and selected area electron diffraction (Figure ) of Au@CloseLarge clearly shows the bands representing crystalline TiO2 (anatase and rutile phase) and Au with no difference in XRD band reflections observed for Au@CloseSmall and Au@DistantSmall (Figure ). It can be observed that for all the SPs the size and shape of SPs is non-uniform. This is mainly as kinetics of electrostatic interactions are in general difficult to control. Some studies have attempted to control the kinetics by varying pH and using different solvents, but in that case controlling the directionality to form a structured crystal is not viable. Au@DistantSmall. f-g) SEM image of Au@CloseLarge with varying magnification. EDX map of Au@CloseLarge SPs with map of h) Au and i) Ti. j) XRD pattern of Au@CloseLarge with