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. 2020 Nov 10;420:127655. doi: 10.1016/j.cej.2020.127655

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Fig. 3 — The cross-sectional FESEM micrograph of the GO-decorated Au/FBG probe, inset illustrates the EDX spectra of the selected area (a) and top view of coated FBG, inset depicts the three-dimension AFM topographic image of the selected area (b).