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. 2021 Jun 13;19:181. doi: 10.1186/s12951-021-00932-2

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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. 1 — Characterization of BPQDs and BBPQDs. a1 TEM analysis of BPQDs. a2 AFM analysis of BPQDs. a3 Size distributions of BPQDs determined by DLS. b1 TEM analysis of BBPQDs. b2 AFM analysis of BBPQDs. b3 Size distributions of BBPQDs determined by DLS. c Photographs of the BPQDs and BBPQDs stored for different periods of time (0 and 8 days). d Raman scattering spectra acquired from the BPQDs and BBPQDs. e Heating curves of PBS, BPQDs, and BBPQDs upon 808 nm laser irradiation (1.0 W/cm²). f Heating curves of BBPQDs at different concentrations under laser irradiation (808 nm, 1.0 W/cm²). g Heating curves of BBPQDs at different power densities. h Heating curves after five cycles of 808 nm laser exposure (1.0 W/cm²)