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 | Conference: | SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring | 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 | Schools: | School of Mechanical and Aerospace Engineering | Research Centres: | Singapore Centre for 3D Printing | 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 |
Files in This Item:
File | Description | Size | Format | |
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Electrically tunable window based on microwrinkled.pdf | 1.01 MB | Adobe PDF | View/Open |
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