Research / 2020 / Article / Fig 1

Research Article

3D Printed Ultrastretchable, Hyper-Antifreezing Conductive Hydrogel for Sensitive Motion and Electrophysiological Signal Monitoring

Figure 1

Preparation and characteristics of the hydrogel. (a) Schematic of the high-resolution fast up-bottom fabrication of the PμSL technique. (b) Structural characterization of hydrogels via photopolymerization in the presence of nanoparticles. (c) Photographs of the complex structures made of the proposed hydrogel, including the Kelvin foam and tree-like complex 3D structures (dyed with methylene blue); the scale bar is 5 mm. (d) Raman spectra of the C=C and C-H in the hydrogel. (e) Raman spectra of the CH, CH2, and O-H in the hydrogel with different weight ratios of water/glycerol. (f) XRD spectra of the distribution of the hydroxyapatite nanoparticles. (g) TEM of the printed conductive hydrogel; the scale bar is 200 nm. (h) SEM of the printed conductive hydrogel without nanoparticles; the scale bar is 5 μm. (i) SEM of the printed conductive hydrogel with nHAp; the scale bar is 10 μm.