Research / 2022 / Article / Fig 2

Research Article

Ten-Hour Stable Noninvasive Brain-Computer Interface Realized by Semidry Hydrogel-Based Electrodes

Figure 2

(a) Illustration of the structure of a 3D-printed mold. (b) Fabrication process of the partially metalized PVA hydrogel. (c) Fabrication process of the metalized melamine sponge. (d) Illustration of the structure of the AgPHMS semidry electrode. (e–g) SEM images of metalized PVA hydrogel. (h–j) SEM images of the metalized melamine sponge. (k) XRD spectra of metalized PVA hydrogel and the hydrogel substrate. (l) XPS peak-differentiation-imitating analysis of Ag 3d, performed on metalized PVA hydrogel. (m) XPS peak-differentiation-imitating analysis of C 1s, performed on metalized PVA hydrogel. (n) TGA (red) and differential thermal analysis (blue) of metalized PVA hydrogel.