具拉伸及生物可相容性之水膠：製備、特性分析及於電阻式記憶體應用

Abstract

Abstract Biodegradable/biocompatible organic materials are a safe, non-toxic, renewable, and low-cost alternative to traditional inorganic and plastic options. In the world of electronic substrates, hydrogels are a viable “green” alternative to traditional stretchable electronic substrates but lack a direct integration pathway because of intrinsic properties like solvent evaporation, high water content, and poor mechanical characteristics. If these weaknesses were overcome, a suitable scaffold for fully stretchable, non-toxic, and biocompatible electronics could be recognized. In the first part of the thesis (chapter 2), a biocompatible, non-toxic, self-healing, mechanically tough, vapor absorbing and retaining, and recyclable PVA:PMAA pseudo-hydrogel is facilely fabricated. TGA, DSC, XRD, FTIR, and self-healing testing were used to confirm that the full blending of PVA and PMAA polymers as well as give insight on the strong hydrogen cross-link bonding between them. Stress-strain curves, relaxation times, loading and unloading mechanical testing revealed the high elongation, fast recovery, and tunable mechanical properties which helped confirm the 3D gel network of the pseudo-hydrogel structure. The pseudo-hydrogel interactions with water were especially important as the gel was able to absorb and retain water vapor which is a novel property. The gel was also able to dissolve fully in water which is important for recycling and biodegradable pathways. In the second part of the thesis (chapter 3), we built upon the stretchable, biocompatible, nontoxic, and water-soluble nature of the pseudo-hydrogel and fabricated a high performance resistive DNA memory device. Using St-DNA as a charge trapping and transporting layer, the memory device was fabricated using a structure of 1:1 pseudo-hydrogel/1:4 PEDOT:PU/St-DNA/1:4 PEDOT:PU to preserve the “green” properties of the pseudo-hydrogel. The device exhibited WORM memory characteristics similar to literature findings with a Vc,ON of 2V, a high ON/OFF current ratio of 104 and a long retention time of 104s. The device also retained these memory characteristics under 10, 30, and 50% strain as well as 1000 strain cycles at 30% strain. The device could be easily dissolved in DI water, which opens up recyclability, bioresorbability, and biodegradability potential.