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. 2021 Jan 4;13:30. doi: 10.1007/s40820-020-00547-6

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© The Author(s) 2020, corrected publication 2022

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Fig. 2 — Synthesis and characterization of 3D NBGS. a–d Digital photographs of BGS and NBGS with 3D geometrical structure. The scale bar is 3 mm. e-p Photographs and different magnifications of SEM images of NBGS and BGS. From left to right, the scale bar is 500 μm, 5 μm and 1 μm, respectively. q XRD patterns of BGS and NBGS. r XPS spectra of BGS and NBGS. s Raman survey of BGS and NBGS. (Color figure online)