Figure 2: Characterisation of Gold nanostars - TEM image of gold nanostars synthesised with R[HEPES]/[HAuCl4] of 200 (scale bar: 100 nm). HRTEM image of a single gold nanostar inset (A), Absorption spectra of gold nanostars synthesised with different concentration ratio of gold precursor to reducing agent (B), and distribution of gold nanostars based on number of tips (C).