Fig. 3. Photoacoustic properties of SiCNPs. (a) Photoacoustic spectra, (b) photoacoustic image and (c) the corresponding quantification of the photoacoustic intensity at 725 nm. (d) Photoacoustic signal of SiCNP620 was linearly dependent on the particle concentration. The limit of detection of SiCNP620 was found to be 10 μg mL−1. Error bars are standard deviations of 5 regions of interest.
