Kim-SOM.revision.1

Kim-SOM.revision.1 - Correction 25 August 2011...

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Correction: 25 August 2011 www.sciencemag.org/cgi/content/full/333/6044/838/DC1 Supporting Online Material for Epidermal Electronics Dae-Hyeong Kim, Nanshu Lu, Rui Ma, Yun-Soung Kim, Rak-Hwan Kim, Shuodao Wang, Jian Wu, Sang Min Won, Hu Tao, Ahmad Islam, Ki Jun Yu, Tae-il Kim, Raeed Chowdhury, Ming Ying, Lizhi Xu, Ming Li, Hyun-Joong Chung, Hohyun Keum, Martin McCormick, Ping Liu, Yong-Wei Zhang, Fiorenzo G. Omenetto, Yonggang Huang, Todd Coleman, John A. Rogers* *To whom correspondence should be addressed. E-mail: [email protected] Published 12 August 2011, Science 333 , 838 (2010) DOI: 10.1126/science.1206157 This PDF file includes: Materials and Methods Figs. S1 to S17 References ( 35–40 ) Other Supporting Online Material for this manuscript includes the following: (available at www.sciencemag.org/cgi/content/full/333/6044/838/DC1) Movies S1 and S2 Correction: On several pages and in certain figures, the substrate material has been correctly identified as a modified silicone (not polyester) produced by Smooth-on, Easton, USA (not BASF).
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1 Supporting Online Material S1. Estimation of driving forces for interfacial delamination between devices and skin Fracture mechanics of a linear elastic bilayer system (34) gives a steady-state driving force of 2 2 1 ε Eh G = for interface delamination between a thin film of Young’s modulus E and thickness h and a thick substrate under uniform tensile strain . As a very rough estimation, f or tensile/compressive strain of 1%, the driving forces for interface delamination of 1 mm-thick sheet of silicon ( E = 180 GPa) and 75 μ m-thick sheet of polyimide ( E = 4 GPa) are 9×10 3 J/m 2 and 15 J/m 2 , respectively. For EES ( E = 150 kPa, h = 30 μ m), the driving force is only 2.25×10 -4 J/m 2 , which is more than four orders of magnitude lower than silicon or polyimide based devices. S2. Sample preparation for confocal microscopy To prepare samples for confocal microscopy, we stained the polymers and the pig skin with fluorescent dyes having distinct excitation and emission bands, as shown in Fig. S2A. Alexa 488 (Invitrogen ® ) was used to stain the substrate (0030 Ecoflex ® , Smooth-On, Inc, which we refer to in the following as a modified silicone or, more simply, silicone). Ten grams of Alexa 488 powder was first dissolved in 300 μ l DMSO (Dimethyl Sulfoxide). Next, 1 μ l of the 488-DMSO solution was diluted by 1 ml toluene and 100 μ l of the resulting 488-DMSO-toluene solution was added to 2 ml Part A pre-polymer of 0030 Ecoflex ® . A magnetic stir bar was used
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2 to facilitate mixing, for 1 hour. We next added 2 ml Part B pre-polymer of Ecoflex and further mixed for 5 minutes. Spin coating this pre-polymer mixture at 3000 rpm onto a water-soluble PVA substrate and curing at room temperature for 4 hours and then at 70°C for 2 hours completed the preparation of the stained silicone. Alexa 647 (Invitrogen ® ) was used to stain a film of polyimide, patterned into the shape of representative electronic circuits with FS or FS- island designs. For the polyimide we dissolved ten grams of Alexa 647 powder into 300 μ l DMSO. We then added 1 μ l 647-DMSO to 1 ml NMP (N-Methylpyrrolidone) and mixed 10 μ l of the resulting 647-DMSO-NMP solution into 1 ml of polyimide pre-polymer.
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This note was uploaded on 02/15/2012 for the course BIO 551 taught by Professor Hsai during the Spring '12 term at USC.

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Kim-SOM.revision.1 - Correction 25 August 2011...

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