Figure 1.

The photoacoustic amplitude of four different sized AuNRs (a) as a function of concentration from 1 × 10 ⁹ − 1 × 10¹¹ NP/mL as measured with a 1 MHz probe, and (b) at a fixed concentration of 1 × 10¹¹ NP/mL, measured using a pre-clinical multispectral optoacoustic tomographic (MSOT) system.