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Study of Brush-Painted Ag Nanowire Network on Flexible Invar Metal Substrate for Curved Thin Film Heater

1
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Korea
2
Department of Fine Arts, Sungkyunkwan University, 25-2, Sungkyunwan-ro, Jongno-gu, Seoul 03063, Korea
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1073; https://doi.org/10.3390/met9101073
Received: 9 September 2019 / Revised: 25 September 2019 / Accepted: 30 September 2019 / Published: 2 October 2019
The objective of this study was to determine the characteristics of brush-painted Ag nanowires (NW) network electrode on a SiO2 coated invar substrate for high performance curved thin film heaters (TFHs). To avoid influence of a conductive invar metal foil substrate, thin SiO2 film was deposited on an invar substrate as an insulating layer. We measured sheet resistance, optical reflectance, and surface morphology of Ag NWs/SiO2/invar as a function of the number of brush painting from one to four times. Optimized brush-painted Ag NWs network on a SiO2/invar substrate showed a low sheet resistance 38.52 Ω/square, which was acceptable for fabrication of curved TFHs. Based on a lab-made bending and fatigue tester, critical radius of the optimized Ag NWs/SiO2/invar electrode was found to be 6 mm. It demonstrated superior repeated flexibility of an Ag NW/SiO2/invar substrate. Furthermore, we demonstrated the feasibility of using a brush-painted Ag NW/SiO2/invar substrate as an electrode for curved TFHs. These curved TFHs fabricated on an Ag NW/SiO2/invar substrate showed rapid heating properties and high saturation temperature even at low applied voltage due to low resistivity of Ag NW network. This indicates that a brush-painted Ag NW/SiO2/invar substrate is a promising flexible electrode and substrate for high performance curved TFHs. View Full-Text
Keywords: brush-painted Ag nanowire; invar metal substrate; thin film heater; electrode; flexibility; saturation temperature brush-painted Ag nanowire; invar metal substrate; thin film heater; electrode; flexibility; saturation temperature
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Kim, Y.J.; Kim, G.; Kim, H.-K. Study of Brush-Painted Ag Nanowire Network on Flexible Invar Metal Substrate for Curved Thin Film Heater. Metals 2019, 9, 1073.

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