Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is © The Royal Society of Chemistry 2018 Supporting Information Layer-by-layer assembled graphene multilayers on multidimensional surfaces for highly durable, scalable, and wearable triboelectric nanogenerators Il Jun Chung,†a Wook Kim,†b Wonjun Jang,a Hyun-Woo Park,c Ahrum Sohn,d Kwun-Bum Chung,c Dong-Wook Kim,d Dukhyun Choi*b and Yong Tae Park*a aDepartment of Mechanical Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi-do, 17058, Republic of Korea Email:
[email protected] bDepartment of Mechanical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin, Gyeonggi-do, 17104, Republic of Korea Email:
[email protected] cDivision of Physics and Semiconductor Science, Dongguk University, 30, Pildong-ro 1-gil, Jung-gu, Seoul, 04620, Republic of Korea dDepartment of Physics, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Republic of Korea Fig. S1 Power generation mechanism of G-TENGs. a–d) Potential distribution of the G- TENG simulated by the COMSOL multi-physics software. Fig. S2 FE-SEM images of (a) the top surface of a bare (flat) PET substrate, (b) the top surface of an NaOH-etched (undulated) PET substrate, and (c) an NaOH-etched PET substrate tilted about 30 degrees. Fig. S3 (a) Visible light absorbance spectra of the LbL-assembled graphene films (1 to 10 BLs, wavelength = 450-850 nm). (b) Dependence of the light absorbance at 550 nm wavelength of the LbL-assembled graphene films (1 to 10 BLs) on the number of bilayers.