Electrical and Computer Engineering
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Browsing Electrical and Computer Engineering by Subject "3D printing"
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Item Open Access Graphene-based devices fabricated by low-cost methods on novel surfaces(2023-08-04) Tavakkoli Gilavan, Mehraneh; Grau, GerdGraphene is a promising material due to its superior strength, high electrical conductivity, and high thermal conductivity. The large surface area, flexibility, and piezo-resistivity of graphene make it ideal for sensing applications. The focus of this project is graphene-based devices fabricated through different low-cost and rapid manufacturing methods for specific applications. In the first part of the project, the graphene properties fabricated by laser-induced graphene on polyetherimide are studied. The main innovation in this part is using a 3D printed substrate instead of conventional commercial substrates. Also, a set of material characterizations is conducted on 3D printed and commercial samples. In the second part, an inkjet printer is used to print graphene oxide on various substrates. Different reduction methods are studied to restore the conductivity of reduced graphene oxide. Finally, a silicon-based junction field-effect transistor (JFET) with a printed reduced graphene oxide top gate is designed and fabricated to detect pH.Item Open Access Manufacturing Strain Sensor Via Printed Electronics Onto 3D Printed Substrates(2023-12-08) Badrian, Babak; Grau, GerdInkjet printing is a promising technology with advantages such as digital customization, reduced cost and fabrication time, and non-contact printing. These features enable inkjet printing to fabricate on novel, diverse substrates such as 3D printed substrates. 3D printing technology builds 3D structures with freedom of design, mass customization, low cost, and ability to fabricate complex geometries. In this thesis, we aim to integrate inkjet printing with 3D printing technology and fabricate a strain gauge sensor. We use various additive manufacturing (AM) techniques including 3D fused filament fabrication (FFF) printing, extrusion printing, and inkjet printing. We used silver nanoparticle ink and studied different conditions to maximize electrical conductivity of the ink. This optimization includes ultraviolet (UV) time exposure, drop spacing, heating conditions, intense pulsed light parameters, and length shrinkage. A low-cost strain gauge sensor is fabricated onto 3D printed PLA material. The related mechanical/electrical tests are performed for the sensor characterization.