The purpose of research presented in this dissertation is to develop inexpensive processes and applications using ultra-low cost substrate like paper. Intended applications include, but are not limited to, point of care diagnostic assays, micro-robotics, and flexible electronics. The basic process of patterning utilizes change in the surface properties of a hydrophobic area due to laser ablation. Patterns, up to 60 mum, were created reliably, using cheap hydrophobic paper (wax paper, parchment paper etc.) and CO 2 laser. The ablated area is analyzed using SEM and XPS tools to understand change in physical structure and chemical properties. Further, the patterned substrate is used to controllably deposit various substances such as chemicals, magnetic nano-particles, electrically conductive material to impart functionality to paper. Non-aqueous suspensions in hydrocarbon based liquid such as silicone, were also patterned successfully. These functional papers can be used to create for various applications such as mechanical transduction, sensing, and energy storage. Three different devices are presented here, magnetic actuator, paper-battery, and oxygen sensor. All three devices are designed, fabricated, and characterized to demonstrate capability of paper based systems.
展开▼
