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. 2020 Sep 4;6(36):eabb4696. doi: 10.1126/sciadv.abb4696

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Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 2 — (A) Photographs of PDA aqueous solutions with concentration of 50 and 100 μg ml⁻¹. Photo credit: Yuan Zou, Sichuan University. (B) L* values of different PDA aqueous solutions. (C) UV-vis-NIR spectra of PDA-i (i = 0 to 3) ranging from 300 to 1500 nm. (D) Temperature elevations of PDA-3 at different concentrations under 808-nm laser irradiation. (E) The photothermal response of PDA-i (i = 0 to 3) aqueous solutions (100 μg ml⁻¹) for 600 s with 808-nm laser irradiation, and then the laser was shut off. (F) Temperature curves of PDA-3 (100 μg ml⁻¹) under four on/off cycles and under 808-nm laser irradiation. The light intensity of 808-nm laser was 2.0 W cm⁻². (G) Molar extinction coefficient, ΔT, and total photothermal efficiency of PDA-i (i = 0 to 3). Photo credit: Yuan Zou, Sichuan University.