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1 Supporting Information Flexible, Cuttable and Self-Waterproof Bending Strain Sensors Using Microcracked Gold Substrate Xinqin Liao, 1, Zheng Zhang, 1, Qijie Liang, 1 Qingliang Liao, 1, *and Yue Zhang 1, 2, * 1 State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing , China 2 The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing , China * Corresponding author, liao@ustb.edu.cn; yuezhang@ustb.edu.cn. S-1

2 Figure S1. (a, b) Atomic force microscope images of Au nanoparticles film. S-2

3 Figure S2. FESEM images of abrasive papers of (a, b) mesh and (c, d) mesh coated with Au nanoparticles film. S-3

4 Figure S3. Roughness profiles of (a) smooth and abrasive papers of (b) 800, (c) 1 500, (d)2 000, (e) 6 000, (f) 8 000, (g) , and (h) mesh. S-4

5 Figure S4. (a) Roughness (R a ) and (b) absolute average height (AAH) of smooth and different abrasive papers extracted from Figure S3. S-5

6 Figure S5. The relationship between thickness of sputtered Au film and sputtering time. S-6

7 Figure S6. Current-voltage (I-V) curves for (a) smooth and (b) abrasive paper-based bending strain sensors under different strains. S-7

8 Figure S7. FESEM images of the abrasive paper coated with Au nanoparticles film under (a, c) strainless and (b, d) strain conditions. Red arrows and blue line circles indicate the newborn microcracks. Red dotted line ellipses show the deformation of microcrack. The crack density the density of cracks is 13 ± 4 ( 10 3 /mm 2 ) from (b). S-8

9 Table S1. Comparison of the recently reported sensors. Materials Response time (ms) GF Durability Ref. Graphene/PDMS - ~4-1 CB/PDMS/Toluene - ~ Graphene/Rubber AgNWs/PDMS ~ CNTs/PDMS ~ Graphene foam/pdma Au particles/mpa AuNPs/PET Au particles/egain/pdms 100 ~ Ni/rGO/Al 2 O 3 /Au/PES - ~ Au nanofilms/abrasive paper < > This work S-9

10 Figure S8. Basic resistance of bending strain sensor (a) before and (b-d) after submerged into pure water. S-10

11 Figure S9. Basic resistance of bending strain sensor (a) before and (b) after submerged into water over 1 meter for 30 min. Red dotted line ellipse indicate the bending strain sensor. S-11

12 Figure S10. (a) Photographs of the sensor attached to arm skin of a tester. (b) The normalized resistance change of the sensor as a function of muscle flexing. Reference 1. Kim, K. S.; Zhao, Y.; Jang, H.; Lee, S. Y.; Kim, J. M.; Kim, K. S.; Ahn, J.-H.; Kim, P.; Choi, J.-Y.; Hong, B. H. Large-Scale Pattern Growth of Graphene Films for Stretchable Transparent Electrodes. Nature 2009, 457, S-12

13 2. Kong, J.-H.; Jang, N.-S.; Kim, S.-H.; Kim, J.-M. Simple and Rapid Micropatterning of Conductive Carbon Composites and Its Application to Elastic Strain Sensors. Carbon 2014, 77, Boland, C. S.; Khan, U.; Backes, C.; O Neill, A.; McCauley, J.; Duane, S.; Shanker, R.; Liu, Y.; Jurewicz, I.; Dalton, A. B.; Coleman, J. N. Sensitive, High-Strain, High-Rate Bodily Motion Sensors Based on Graphene Rubber Composites. ACS Nano 2014, 8, Amjadi, M.; Pichitpajongkit, A.; Lee, S.; Ryu, S.; Park, I. Highly Stretchable and Sensitive Strain Sensor Based on Silver Nanowire Elastomer Nanocomposite. ACS Nano 2014, 8, Cai, L.; Song, L.; Luan, P.; Zhang, Q.; Zhang, N.; Gao, Q.; Zhao, D.; Zhang, X.; Tu, M.; Yang, F.; Zhou, W.; Fan, Q.; Luo, J.; Zhou, W.; Ajayan, P. M.; Xie, S. Super-Stretchable, Transparent Carbon Nanotube-Based Capacitive Strain Sensors for Human Motion Detection. Sci. Rep. 2013, 3, Jeong, Y. R.; Park, H.; Jin, S. W.; Hong, S. Y.; Lee, S.-S.; Ha, J. S. Highly Stretchable and Sensitive Strain Sensors Using Fragmentized Graphene Foam. Adv. Funct. Mater. 2015, 25, Moreira, H.; Grisolia, J.; Sangeetha, N. M.; Decorde, N.; Farcau, C.; Viallet, B.; Chen, K.; Viau, G.; Ressier, L. Electron Transport in Gold Colloidal Nanoparticle-Based Strain Gauges. Nanotechnology 2013, 24, Farcau, C.; Sangeetha, N. M.; Moreira, H.; Viallet, B.; Grisolia, J.; Ciuculescu-Pradines, D.; Ressier, L. High-Sensitivity Strain Gauge Based on a Single Wire of Gold Nanoparticles Fabricated by Stop-and-Go Convective Self-Assembly. ACS Nano 2011, 5, S-13

14 9. You, I.; Kim, B.; Park, J.; Koh, K.; Shin, S.; Jung, S.; Jeong, U. Stretchable E-Skin Apexcardiogram Sensor. Adv. Mater. 2016, /adma Trung, T. Q.; Tien, N. T.; Kim, D.; Jang, M.; Yoon, O. J.; Lee, N.-E. A Flexible Reduced Graphene Oxide Field-Effect Transistor for Ultrasensitive Strain Sensing. Adv. Funct. Mater. 2014, 24, S-14

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