Pattern Design of Printed Silver Nanowire for Thin Film Heater
Date Issued
2015
Date
2015
Author(s)
Wang, Po-Hsuan
Abstract
In this study, we introduced a convenient and facile direct printing method to fabricate a patterned silver nanowires (AgNWs) thin film. With a mesh structure, it can be served as a micro heater with both good transparency and high thermal/electrical conductivity. Due to the percolative effect of AgNWs, through inkjet process, the number density of AgNWs per unit area can also be effectively controlled, which can affect the local resistance directly. This creates the possibility to design the desired gradient heater, heater array, and patterned heater. Sedimentation test was carried out to ensure the stability of AgNWs ink and to prevent the clogging at inkjet nozzle. For the ink formulation, the as-prepared AgNWs solution was dispersed in deionized water and inkjet printed under 45°C on glass and PET without annealing post treatment. The width of printed silver single line was about 100 um from scanning electron microscope (SEM). By utilizing IR thermography, the maximum temperature for a thin film mesh heater can rise up above 90oC at an input voltage of 4 volt with a uniform heating. For the design of pattern, a gradient heater was fabricated through simple serial and parallel circuits with different printed layers. The temperature difference can reach 50°C at an input voltage of 15V. When the substrate changed to PET, the heating device showed a very short response time (<5 sec) compared to the glass. Bending test proved that the AgNWs heater on PET substrate can endure more than 5000 times of bending cycles. Also we combined the theory of 1-D heat transfer to discuss the influence of changing substrate. Combined with the thermochromic application, this technique demonstrated a great potential for printed electronics.
Subjects
Inkjet printing, Silver nanowires
Metal mesh
Electrode
Thin film heater
Pattern.
Type
thesis
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