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. 2020 Jan 24;12:38. doi: 10.1007/s40820-020-0378-6

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© The Author(s) 2020

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/.

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Fig. 1 — Characterization of CuS NPs and CuS-PEG NPs. a Morphology and size of CuS NPs. b Morphology and size of CuS-PEG NPs. c Apparent zeta potential of CuS NPs and CuS-PEG NPs. d Diameters of CuS-PEG NPs stored in FBS. e Linear fitting plots of PA amplitudes versus the concentration of CuS-PEG NPs under NIR laser irradiation. The inset is the PA image of CuS-PEG solution with different concentrations. f Absorption spectrum of CuS-PEG NPs. The error bars represent standard deviations (n = 3 per group)