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dc.contributor.advisorLee, Yongkuk
dc.contributor.authorAl Wahid, Ali Mohammed
dc.descriptionThesis (M.S.)-- Wichita State University, College of Engineering, Dept. of Biomedical Engineering
dc.description.abstractInkjet printing techniques, a good alternative of the traditional MEMS techniques, can be utilized to fabricate flexible and stretchable electronics, which can be used for healthcare applications. Therefore, the objectives of this study are 1) Providing proof of concept for the inkjet printing parameters for silver (Ag) and polyimide (PI) inks, 2) understanding the relationship between the dynamics of inkjet-printed patterns and surface energies of the substrate, and 3) demonstrating printing a flexible circuit on a PI coated substrate. During experiments, the effects of the printing parameters including jetting voltages, cartridge temperatures, and drop spacings of both the Ag and PI inks via the drop size and line width measurements were explored. The surface energies were manipulated by applying $O_2$ and $CF_4$ plasma for different durations using Reactive Ion Etching (RIE) that were measured by the means of contact angle measurements and ink drop size and line width measurements. Our results indicated that 1) the drop sizes increase as jetting voltages and cartridge temperatures increase, respectively, 2) the line widths decrease with increasing drop spacings, and 3) the $CF_4$ plasma increases the hydrophobicity of the surface while $O_2$ increases the hydrophilicity of the surface. Collectively, we successfully demonstrated accurate printing of multi-layered ECG circuit with a drop size of 40 $\mu{m}$ for the Ag ink and PI ink. The next goal will be to demonstrate wireless continuous monitoring of reliable ECG signals using the printed ECG circuit.
dc.format.extentxvi, 131 pages
dc.publisherWichita State University
dc.rights© Copyright 2022 by Ali Mohammed Al Wahid All Rights Reserved
dc.subject.lcshElectronic dissertations
dc.titleInkjet printing techniques for wearable/stretchable electronics in healthcare

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  • BioMed Theses
  • CE Theses and Dissertations
    Doctoral and Master's theses authored by the College of Engineering graduate students
  • Master's Theses
    This collection includes Master's theses completed at the Wichita State University Graduate School (Fall 2005 -- current) as well as selected historical theses.

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