fig4

Figure 4. (A) Photograph of aqueous solution of L-Au NPs after hydrothermal treatment of L-Au@SiO₂. (B) TEM image of L-Au NPs. (C) CD and UV/Vis spectra of D-Au and L-Au NPs. (D) Low magnification STEM image (viewed along the direction of {111}) of D-Au@SiO₂-500. (E) Atomic resolution STEM image of the square region in (D). (F) Enlarged image of (E) showing the non-straight arrangement of the atomic array. This figure is used with permission from the Royal Society of Chemistry^[41]. NPs: Nanoparticles; TEM: transmission electron microscopy; CD: circular dichroism; STEM: scanning transmission electron microscopy.