Date of Award
Doctor of Philosophy
Transient electronics is a class of electronic devices designed to maintain stable operation for a desired and preset amount of time; and, undergo fast and complete degradation and deconstruction once transiency is triggered. Understanding the mechanism and controlling the destruction rate of transient electronics is of significant importance in design of application-specific devices. One major concern with transient electronics is the typical mismatch in mechanical properties of substrate materials and those for electronic components, resulting in malfunction when the device is subjected to a mechanical load. This dissertation investigates destruction mechanism of transient electronics, as well as studies potential solutions to minimize failure caused by the aforementioned mechanical mismatch between the materials. Few potential applications of transient materials/electronics are then discussed while their performance is analyzed.
The first study was intended to control the transiency of devices containing colloidal metal particles as electronic components, through the dissolution behavior of the substrate. It was observed that the physical circuit-substrate interactions were the dominating factor in the overall transiency behavior of the device.
Presented in second study, are investigations of electronic attributes of transient soft bioelectronic circuits subjected to mechanical force; also, the influence of substrate’s transiency on the loss of functionality in triggered devices. The experimental results suggest that there exists a correlation between electronic properties of circuits and applied mechanical strain. A correlation was also observed between the dissolution behavior of the substrate and loss of functionality of the electronic device.
The third study is focused on design and implementation of a material system that exhibits active transiency by undergoing secondary reactions in acidic solvents. This system produces micro-bubbles when triggered, bubbles expedite transiency of the system by facilitating redispersion of conductive materials.
The forth study was intended to address the failure caused by mechanical load in the polymer metal systems. We studied mechanical-electrical correlations in pre-strained flexible electronics and quantified the effect of pre-straining on the lifespan and failure of the system.
Presented in the fifth study is a transient Li-ion battery based on polymeric constituents, exhibiting two-fold increase in potential and approximately three orders of magnitude faster transiency rate compare to other transient systems reported in the literature. Transiency in this device is achieved through a hybrid approach of redispersion of insoluble, and dissolution of soluble components.
The sixth study is intended to design and implement polymer-based interpenetrating network films (IPNFs) with programmable degradation and release kinetics which controlled release of therapeutic proteins or vaccines.
Finally, the seventh study is focused on implementing a transient film as a potential platform for printed circuit board, which allows full recovery of the electronic components. This study was aimed to diminish the hazards and environmental pollutions associated with waste electrical and electronic equipment (WEEE).
Jamshidi, Reihaneh, "Polymeric materials for transient and soft electronic devices" (2018). Graduate Theses and Dissertations. 17220.