Figure 1.

FESEM images and high magnification of networked gold nanoparticles and optical absorption spectra of gold nanostructures. (A to C) FESEM images of networked gold nanoparticles grown on ITO surface for different magnification. The sample was prepared using a growth solution that contains 0.5 mL of 0.01 M HAuCl₄, 12 mL of 0.1 M CTAB, 8 mL of 0.1 M HMT and 0.1 mL of 0.1 M ascorbic acid. (D) Optical absorption spectra of gold nanostructures showing two plasmonic characters, namely transverse (ca. 525 nm) and longitudinal (ca. 625 nm) surface plasmon resonance. (E) Shows high magnification of networked gold nanoparticles and possible origin of LSPR on the nanostructures. Scale bars are 1 μm in A and 100 nm in B to C.