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Title:Materials for bioimplantable / bioresorbable electronics
Author(s):Lee, Yoon Kyeung
Director of Research:Rogers, John A.
Doctoral Committee Chair(s):Rogers, John A.
Doctoral Committee Member(s):Murphy, Catherine J.; Girolami, Gregory S.; Nuzzo, Ralph G.
Department / Program:Chemistry
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Flexible electronics
Bioresorbable electronics
Abstract:Recent advances in materials, mechanics design and microfabrication technologies are beginning to establish the foundations for electronics of thin layouts that conformally interface with the human organs including the brain, the heart and epidermis. Certain of the thin materials including silicon and various metal oxide membranes have been found to completely degrade in water, which have substantiated the concept of bioresorbable electronics systems. The current study presents four independent topics of research on materials and device architecture related to this unconventional format of electronics. The first work introduces chemical sensing systems on thin elastomeric substrates with open cellular designs to prevent artificial accumulation or depletion of chemicals of interest. The materials, designs and integration strategies provide a framework for chemical sensors capable of monitoring biomarkers in extracellular fluid, with soft physical form factors to facilitate bio-integration. The next chapters investigate chemical stabilities of thin nanomembranes of silicon and thermally grown silicon dioxide in biofluids for their provisioned importance as a thin film water barrier in implantable flexible electronics. The different materials dissolution rates in silicon and its oxide provide materials design options in device construction depending on the device target lifetimes. The last chapter describes a conductive ink formulation that exploits electrochemical sintering of Zn microparticles in aqueous solutions at room temperature, with relevance to emerging classes of biologically and environmentally degradable electronic devices. The resulting electrochemistry establishes the basis for a remarkably simple procedure for printing highly conductive features of degradable materials at ambient conditions over large areas.
Issue Date:2017-10-17
Rights Information:Copyright 2017 Yoon Kyeung Lee
Date Available in IDEALS:2018-03-13
Date Deposited:2017-12

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