Fig. 3
In vitro photoacoustic properties of AuTR and AuNRs: a concentration-dependent photoacoustic signal intensity of AuTR and Au rod1 irradiated by 800- and 680-nm laser, respectively, b PAI of glass capillary fulfill with blood balance mixed with 1 nM AuTR or Au rod1 irradiated by 800- and 680-nm laser, c, d the comparison of photoacoustic signal amplitude between pure blood and blood balance mixed with 1 nM AuTR or Au rod1 irradiated by 800- and 680-nm laser, e1–e6 comparison of absorption spectra (solid line) of five kinds of synthesized AuNRs and fresh ox blood obtained from multi-wavelength photoacoustic signals amplitude (data points)