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Title: Spray Coating of Crack Templates for the Fabrication of Transparent Conductors and Heaters on Flat and Curved Surfaces
Authors: Gupta, Ritu
Rao, K. D. M.
Srivastava, Kartikeya
Kumar, Ankush
Kiruthika, S.
Kulkarni, G. U.
Keywords: Nanoscience & Nanotechnology
Materials Science
Spray Coating
Crack Network
Ag Wire
Curved Electrode
Transparent Heater
Organic Solar-Cells
Silver-Nanowire Networks
Carbon Nanotube
Flexible Heaters
Wire Network
Issue Date: 2014
Publisher: American Chemical Society
Citation: Gupta, R; Rao, KDM; Srivastava, K; Kumar, A; Kiruthika, S; Kulkarni, GU, Spray Coating of Crack Templates for the Fabrication of Transparent Conductors and Heaters on Flat and Curved Surfaces. ACS Applied Materials & Interfaces 2014, 6 (16) 13688-13696,
ACS Applied Materials & Interfaces
Abstract: Transparent conducting electrodes (TCEs) have been made on flat, flexible, and curved surfaces, following a crack template method in which a desired surface was uniformly spray-coated with a crackle precursor (CP) and metal (Ag) was deposited by vacuum evaporation. An acrylic resin (CP1) and a SiO2 nanoparticle-based dispersion (CP2) derived from commercial products served as CPs to produce U-shaped cracks in highly interconnected networks. The crack width and the density could be controlled by varying the spray conditions, resulting in varying template thicknesses. By depositing Ag in the crack regions of the templates, we have successfully produced Ag wire network TCEs on flat-flexible PET sheets, cylindrical glass tube, flask and lens surface with transmittance up to 86%, sheet resistance below 11 Omega/square for electrothermal application. When used as a transparent heater by joule heating of the Ag network, AgCP1 and AgCP2 on PET showed high thermal resistance values of 515 and 409 degrees C cm(2)/W, respectively, with fast response (<20 s), requiring only low voltages (<5 V) to achieve uniform temperatures of similar to 100 degrees C across large areas. Similar was the performance of the transparent heater on curved glass surfaces. Spray coating in the context of crack template is a powerful method for producing transparent heaters, which is shown for the first time in this work. AgCP1 with an invisible wire network is suited for use in proximity while AgCP2 wire network is ideal for use in large area displays viewed from a distance. Both exhibited excellent defrosting performance, even at cryogenic temperatures.
Description: Restricted Access
ISSN: 1944-8244
Appears in Collections:Research Articles (Kulkarni, G. U.)

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