Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/82293
Title: Electrically tunable window based on microwrinkled ZnO/Ag thin film
Authors: Shrestha, Milan
Asundi, Anand
Lau, Gih-Keong
Keywords: Transparency Tuning
Smart Window
DRNTU::Engineering::Mechanical engineering
Issue Date: 2017
Source: Shrestha, M., Asundi, A., & Lau, G.-K. (2017). Electrically tunable window based on microwrinkled ZnO/Ag thin film. SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 10163, 101631Y-. doi:10.1117/12.2259918
Abstract: Micro-winkling can turn a transparent thin-film of zinc oxide (ZnO) to be ‘opaque’ that can be reversed by unfolding to restore back to the clear state. This principle was previously used to make a mechanically tunable window device. However, ZnO thin film cannot make a compliant electrode to enable electrical unfolding due to its insulator nature. This paper reports the use of multilayer thin films of 10nm silver (Ag) and 30nm thick ZnO to form a compliant electrode with electrically tunable transmittance. A dielectric elastomer actuator (DEA) with a pair of such compliant Ag/ZnO thin films on both sides of a polyacrylate elastomeric membrane (3M VHB 4910) makes an electrically tunable window device. The DEA without radial compression of the elastomer has wrinkle-free electrode. Hence, it is clear with a 47% in-line transmittance (for 550nm wavelength light). In the wrinkled form, under 10% radial compression, it becomes opaque (with less than 1% transmittance). A voltage induced areal expansion of 10% radial strain enables the electrical unfolding of the initial wrinkles. In addition, this device continues to work after 4000 cycles of unfolding and microwrinkling of Ag/ZnO. The performance of electrically tunable window device is comparable to the existing smart window technologies.
URI: https://hdl.handle.net/10356/82293
http://hdl.handle.net/10220/47507
DOI: 10.1117/12.2259918
Rights: © 2017 Society of Photo-optical Instrumentation Engineers. All rights reserved. This paper was published in SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring and is made available with permission of Society of Photo-optical Instrumentation Engineers.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Conference Papers

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