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Silver-Nanoparticle Microcoil via Aerosol Jet Printing

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Silver-Nanoparticle Microcoil via Aerosol Jet Printing ( silver-nanoparticle-microcoil-via-aerosol-jet-printing )

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Sensors 2020, 20, 6087 5 of 13 structures are being printed, a separate hot plate is set to 200 ◦C for curing the silver nanoparticles. A separate hot plate from the platen heater is used as the platen heater is limited to temperatures below 100 ◦C and temperatures greater than 100 ◦C are necessary to properly cure and bake the device. Once the coil and interface pads were printed, they were cured on the hot plate for 15 min. The SU-8 insulation bridge was manually applied using a thin needle and lightly brushing the appropriate location of the insulating layer, across three coil traces, then hard baked for an additional 15 min on the hot plate. The coils were then placed back onto the hot platen of the Optomec Aerosol Jet 200 to manually control the system to draw traces connecting the coil and the interface pads via KEWA control to avoid any alignment issues. The pattern was cured again at 200 ◦C for 15 min on the separate hot plate. Figure 3. (a) Top and side view process flow diagrams for AJP microcoils. (b) The corresponding AutoCAD file. 3. Results 3.1. FEM Validation and Activating Function Analysis The simulations conducted in COMSOL were validated with the 60,000 μm silver coils fabricated with inkjet printing techniques [14], shown in Figure 2. The fabricated coil radiation patterns demonstrated 3.3% error from the FEM radiation patterns when observing the main- beam-to-rear-beam gain ratio in addition to appropriate directivity of the fields (Figure 4). Figure 4. At 90 degrees, the coil pair faces are parallel with each other. (a) 3D depiction of the COMSOL model far-field radiated field pattern of the 60,000 μm diameter coils, which are geometrically identical to the 600 μm coils (V/m). (b) 2D depiction of the COMSOL model far-field radiated field pattern (V/m, 3.709 dB directivity) of the 60,000 μm diameter coils. (c) Average experimental far-field radiated pattern (mV across the coil length, 4.0494 dB directivity) generated from four trials.

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