Figure 9From: Label-free in vitro toxicity and uptake assessment of citrate stabilised gold nanoparticles in three cell lines Spectral profiles of 14 nm and 20 nm AuNPs. Ten spectral profiles of randomly selected AuNPs that appeared visually to be either (A and C) in single suspension, or (B and D) aggregated nanoparticles. Each coloured line represents the spectrum from a single pixel.Back to article page