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Lou, et al.
A B

C D

E F

Figure 3. (A) Photos of samples. (B) Raman spectrum of graphene oxide and coated samples. The morphology of (C) WNC, (D) PNC, and
(E-F) GNC.

Observed under high magnification, the coral-like clusters composed of carbon and oxygen. The distribution area
on the surface of the PNC are full of holes and the texture of the transparent material coincides with the main
is very loose. distribution area of carbon and oxygen, further confirming
Similar to PNC, due to the influence of PNC and that the transparent GO was successfully introduced into
magnetic field, dense clusters are also distributed on the the coating. The weight percentage of each element on
surface of the GNC (Figure 3E). The diameter of clusters the cross section is detected, as shown in Figure 4B.
on the surface of GNC is smaller than that of PNC, which The weight percentage for carbon and oxygen on the
is mainly affected by GO in the plating bath. Unlike PNC, cross section of GNC is 46.1% and 10.8%, respectively.
the clusters on the surface of GNC are covered by a large The sample is corroded by dilute nitric acid and then
amount of transparent sheet-like material (Figure 3F). repeatedly ultrasonically cleaned in deionized water.
The transparent sheet-like material is very consistent with The drying and detection of the samples were carried out
the morphology of GO under the electron microscope. in the ultra-clean room. Such a high content of carbon
Similar phenomenon are reported in the co-deposition of mainly comes from the GO in the coating. The results
copper-GO composites . Combined with the results of of various tests show that massive GO material can be
[48]
Raman spectroscopy, it is confirmed that GO is heavily introduced into the coating by the method of magnetic
covered on the surface of GNC. field-assisted scanning jet electrodeposition, with the
Figure 4A shows the EDS mapping images of help of ferromagnetic particles carrying GO.
the section of GNC. The cross section was previously 3.2. Assessment of antibacterial activity
polished and corroded by nitric acid. A large amount of
transparent sheet-like material can be observed to fills The agar plate assessment was used to evaluate the
the internal pores of the coating. Since GO is mainly antibacterial activity of the samples.

International Journal of Bioprinting (2022)–Volume 8, Issue 1 101