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. Author manuscript; available in PMC: 2021 Mar 25.
Published in final edited form as: Biosens Bioelectron. 2019 Dec 28;151:112000. doi: 10.1016/j.bios.2019.112000

Fig. 2.

Fig. 2.

Optical properties of DCNP@PDA NPs. (a) NIR-II emission spectrum of DCNP@PDA NPs under 808 nm CW laser excitation. (b) The NIR-II fluorescence intensities of DCNP@PDA NPs as a function of mass concentrations of the DCNP@PDA NPs under 808 nm CW laser excitation, with a 1000 nm long-pass filter. (c) The PA amplitudes of DCNP@PDA NPs at 700 nm as a function of mass concentrations of DCNP@PDA NPs. (d) Photostability of DCNP@PDA NPs in terms of normalized fluorescence intensities (black symbols) and PA amplitudes (red symbols) under a 808 nm CW laser exposure and a 700 nm pulse laser irradiation for 1 h, respectively.