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http://dx.doi.org/10.6117/kmeps.2018.25.4.129

Mechanical and Optical Characteristics of Transparent Stretchable Hybrid Substrate using PDMS and Ecoflex Material  

Lee, Won Jae (Graduate School of Nano IT Design Fusion, Seoul National University of Science and Technology)
Park, So-Yeon (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Nam, Hyun Jin (Dept. Of Manufacturing System and Design Engineering, Seoul National University of Science and Technology)
Choa, Sung-Hoon (Graduate School of Nano IT Design Fusion, Seoul National University of Science and Technology)
Publication Information
Journal of the Microelectronics and Packaging Society / v.25, no.4, 2018 , pp. 129-135 More about this Journal
Abstract
In the stretchable electronic devices, the stretchable substrate is a very essential material which determines the stretchability, performances and durability of the stretchable electronic devices. In particular, the current stretchable materials have hysteresis making difficult to used as sensors and other electronic devices. In this study, we developed a PDMS-Ecoflex hybrid stretchable substrate mixed with PDMS and Ecoflex material in order to increase stretchability and improve hysteresis characteristics. Mechanical behavior of the hybrid substrate was evaluated using a tensile test, and optical transmittance of the hybrid substrate was also measured. As the content of Ecoflex increases, the PDMS-Ecoflex hybrid substrate becomes more flexible, and the elastic modulus decreases. In addition, the PDMS substrate failed a tensile strain of 270%, while the PDMS-Ecoflex hybrid substrate did not fail even at 500% strain indicating excellent stretchability. In the repeated tensile test, the hybrid substrate with 2:1 mixing ratio of PDMS and Ecoflex showed hysteresis. On the other hand, in the case of the hybrid substrate with the mixing ratio of 1:1, hysteresis did not occur at a strain of 50% and 100%. Hence, we developed a stretchable substrate with over 150% stretchability and no hysteresis characteristics. The optical transmittance of the Ecoflex substrate was 68.6%, whereas the transmittances of the hybrid substrate with mixing ratio of 2:1 and 1:1 were 78.6% and 75.4%, respectively. These results indicate that the PDMS-Ecoflex hybrid substrate is a potential candidate for a transparent stretchable substrate.
Keywords
Stretchable Substrate; PDMS; Ecoflex; Mechanical Properties;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 C.-X. Liu, and J.-W. Choi, "Analyzing resistance response of embedded PDMS and carbon nanotubes composite under tensile strain", Microelectron. Eng., 117, 1 (2014).   DOI
2 H.-A. Oh, D. Park, K.-S. Han, and T. S. Oh, "Elastic Modulus of Locally Stiffness-variant Polydimethylsiloxane Substrates for Stretchable Electronic Packaging Applications", J. Microelectron. Packag. Soc., 22(4), 91 (2015).   DOI
3 D.-G. Kim, Y. Kim, and J.-W. Kim, "Recent Trends in Development of Ag Nanowire-based Transparent Electrodes for Flexible.Stretchable Electronics", J. Microelectron. Packag. Soc., 22(1), 7 (2015).   DOI
4 M. Belanger, and Y. Marois, "Hemocompatibility, biocompatibility, inflammatory and in vivo studies of primary reference materials low-density polyethylene and polydimethylsiloxane: A review", J. Biomed. Mater. Res., 58(5), 467 (2001).   DOI
5 A. Piruska, I. Nikcevic, S. H. Lee, C. Ahn, W. R. Heineman, P. A. Limbacha, and C. J. Seliskar, "The autofluorescence of plastic materials and chips measured under laser irradiation", Lab Chip, 5(12), 1348 (2005).   DOI
6 F. Hua, Y. Sun, A. Gaur, M. A. Meitl, L. Bilhaut, L. Rotkina, J. Wang, P. Geil, M. Shim, and J. A. Rogers, "Polymer Imprint Lithography with Molecular-Scale Resolution", Nano Lett., 4(12), 2467 (2004).
7 K. F. Lei, K,-F, Lee, and M,-Y, Lee, "A flexible PDMS capacitive tactile sensor with adjustable measurement range for plantar pressure measurement", Microsyst. Technol., 20(7), 1351 (2014).   DOI
8 S. G. Charati, and S. A. Stern, "Diffusion of Gases in Silicone Polymers: Molecular Dynamics Simulations", Macromolecules, 31(16), 5529 (1998).   DOI
9 Y. Gao, G. Yu, J. Tan, and F. Xuan, "Sandpaper-molded wearable pressure sensor for electronic skins", Sens. Actuators A Phys., 280, 205 (2018)   DOI
10 J. H. Kim, J.-Y. Hwang, H. R. Hwang, H. S. Kim, J. H. Lee, J.-W. Seo, U. S. Shin, and S.-H. Lee, "Simple and cost-effective method of highly conductive and elastic carbon nanotube/polydimethylsiloxane composite for wearable electronics", Sci. Rep., 8(1), 1375 (2018).   DOI
11 B. W. An, E.-J. Gwak, K. Kim, Y.-C. Kim, J. Jang, J.-Y. Kim, and J.-U. Park, "Stretchable, Transparent Electrodes as Wearable Heaters Using Nanotrough Networks of Metallic Glasses with Superior Mechanical Properties and Thermal Stability", Nano Lett., 16(1), 471 (2015).   DOI
12 A. Chortos, J. Liu, and Z. Bao, "Pursuing prosthetic electronic skin", Nat. Mater., 15(9), 937 (2016).   DOI
13 M. Liu, J. Sun, Y. Sun, C. Bock, and Q. Chen, "Thickness-dependent mechanical properties of polydimethylsiloxane membranes", J. Micromech. Microeng., 19(3), 035028 (2009).   DOI
14 J.-Y. Choi, D.-W. Park, and T. S. Oh, "Variation of Elastic Stiffness of Polydimethylsiloxane (PDMS) Stretchable Substrates for Wearable Packaging Applications", J. Microelectron. Packag. Soc., 21(4), 125 (2014).   DOI
15 J. Diani, B. Fayolle, and P. Gilormini, "A review on the Mullins effect", Eur. Polym. J., 45(3), 601 (2009).   DOI
16 M. Liu, J. Sun, and Q. Chen, "Influences of heating temperature on mechanical properties of polydimethylsiloxane", Sens. Actuators A Phys., 151(1), 42 (2009).   DOI
17 M. Amjadi, A. Pichitpajongkit, S. Lee, S. Ryu, and I. Park, "Highly Stretchable and Sensitive Strain Sensor Based on Silver Nanowire-Elastomer Nanocomposite", ACS nano, 8(5), 5154 (2014).   DOI
18 T. K. Kim, J. K. Kim, and O. C. Jeong, "Measurement of nonlinear mechanical properties of PDMS elastomer", Microelectron. Eng., 88(8), 1982 (2011).   DOI
19 Y. S. Lee, S. M. Yang, D. Y. Park, W. J. Lee, J. Y. Park, and S.-H Choa "Characteristics of Mechanical Behavior and Environmental Reliability of Ultra-Stretchable Ecoflex Substrates", Nanotech. Lett. 9(8), 1153 (2017).   DOI