Title Page
Contents
Abstract 7
Chapter 1. Introduction 11
Chapter 2. Experimental section 14
2.1. Materials 14
2.2. DN Ionogel ink preparation 14
2.3. Patterened sensor fabrication 15
2.4. Material and device characterization 15
Chapter 3. 3D printing process of Double-Network (DN) ionogel ink for ionic strain sensor 17
3.1. Results and discussion 17
3.1.1. 3D printing process of stretchable strain sensor 17
Chapter 4. Characterization of Double-Network Ionogel electrolyte ink 20
4.1. Results and discussion 20
4.1.1. Characterization of 3d printability of ionogel ink 20
4.1.2. Characterization of double-network ionogel 22
Chapter 5. Characterization of 3D printed strain sensor 26
5.1. Results and discussion 26
5.1.1. Performances of rectangular shape strain sensor 26
5.1.2. Characterization of single-angle zigzag strain sensor 27
5.1.3. Performances of multi-angle zigzag strain sensor 29
Chapter 6. Human action monitoring 34
6.1. Results and discussion 34
6.1.1. Human action monitoring 34
Conclusion 37
References 39
Figure 3.1. Schematic procedure for 3D printed zigzag strain sensor and consisting materials of DN ionogel electrolyte for 3D printing ink. 19
Figure 4.1. (a) Comparing printability with different PVDF-HFP polymer concentrations of 3, 6, 9, 10 wt% and (b) comparing printability with different... 24
Figure 4.2. Mechanical properties recorded by DN ionogel. (a) Comparing the stress-strain curves of DN ionogel with various ratio of polymers (9:3, 9:6, 9:9).... 25
Figure 5.1. Rectangular shape strain sensor of 9:9 DN ionogel. (a) Relative resistance (△R/R₀) of the rectangular shape strain sensor at strain deformation... 31
Figure 5.2. Schematics of zigzag-patterned strain sensor filled with a single angle. (a) 22 numbers of 8˚ teeth, (b) 15 numbers of 14˚ teeth and (c) 11 numbers of... 32
Figure 5.3. (a) Schematics of the multi-angle zigzag patterend strain sensor design. (b) Relative resistance collected from stretchable sensor at various strains... 33
Figure 6.1. Detection of human motions of Zigzag patterned sensor attached to (a) finger, (b) wrist, (c) elbow, (d) knee,and (e) ankle. 36