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. Author manuscript; available in PMC: 2023 Jan 1.
Published in final edited form as: Small Methods. 2021 Dec 15;6(1):e2100900. doi: 10.1002/smtd.202100900

Figure 2. Structure characterizations of the CuGONWs.

Figure 2.

(a) Low magnification SEM image of CuGONW samples. (b, c) TEM image and its magnified view of CuGONW confirm that the GO layer is conformal and uniformly coated on CuNW surfaces. (d-g) EDS characterization of represented CuGONW revealing the elemental distribution of copper, oxygen, and carbon that further confirms its core-shell architecture. (h) Digital image of GO nanosheet solution, pristine CuNWs, and the as-synthesized CuGONWs. (i-j) XRD measurement of CuGONWs. (k) Raman spectra of CurGONWs, CuGONWs, CuNWs, and Si substrate under a wavelength of 532 nm, displaying showing the distinct GO/rGO peaks on CuGONW or CurGONW samples, while no similar peaks are seen on CuNW and the silicon substrate. Cu fluorescence background could also be detected in samples containing CuNW. ID/IG decreased after the CuGONW sample was annealed in forming gas under 280 °C for one hour, suggesting a significant recovery of the conjugated graphitic framework after de-functionalizing oxygen functional groups, which means the GO layer was thermally reduced to rGO.