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. Author manuscript; available in PMC: 2020 Aug 3.
Published in final edited form as: Nat Biomed Eng. 2020 Feb 3;4(3):325–334. doi: 10.1038/s41551-019-0506-0

Fig. 1 |. Characterization of 10 nm FeCo@C-PEG purified by density gradient separation (Fraction #3).

Fig. 1 |

a, High resolution TEM image. b, STEM image and element mapping. c, XRD patterns of FeCo@C-PEG (blue curve) and standard peaks (black) of cubic FeCo (PDF#49–1567). d, Raman spectrum shows G peak (~1,578 cm−1) and D peak (~1,328 cm−1), confirming the presence of a graphitic carbon shell. e, Magnetic hysteresis curve of FeCo@C-PEG (red curve) and Vivotrax (black curve). f, DLS size of FeCo@C-PEG in 1 x PBS and water (inset: photograph of tubes containing FeCo@C-PEG in 1 x PBS and water). g, UV-Vis-NIR absorbance spectra of FeCo@C-PEG at indicated concentrations in water. h, Plots of linear fitting absorbance at 800 nm and 1064 nm for FeCo@C-PEG over concentrations in water.