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. 2021 Dec 24;19:449. doi: 10.1186/s12951-021-01202-x

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — A Infrared thermal images of M@P-PDR at a concentration of 5 mg mL⁻¹ under 808 nm laser irradiation at different power densities (0.75, 1.00, 1.25 and 1.50 W cm⁻²), and B the corresponding temperature–time curves of M@P-PDR at different power densities. C Infrared thermal images of M@P-PDR at different concentrations (0, 1, 2, 3, 4 and 5 mg mL⁻¹) under 808 nm laser (1.5 W cm^˗2, 5 min) irradiation, and D the corresponding photothermal temperature–time curves of M@P-PDRs at different concentrations. E Temperature change curves of M@P-PDR over five laser irradiation on/off cycles. F Linear relationship between PA intensities and M@P-PDR concentrations, and the corresponding in vitro PA images (inset). G T1 relaxation rate of M@P-PDR and the corresponding in vitro MR images (inset)