Supporting Infromation Transparent and Flexible Self-Charging Power Film and Its Application in Sliding-Unlock System in Touchpad Technology Jianjun Luo 1,#, Wei Tang 1,#, Feng Ru Fan 1, Chaofeng Liu 1, Yaokun Pang 1, Guozhong Cao 1,2, Zhong Lin Wang 1,3, * 1 Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences; National Center for Nanoscience and Technology (NCNST), Beijing 100083, China 2 Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, USA 3 School of Material Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA # These authors contributed equally to this work. *Corresponding author: e-mail: zlwang@gatech.edu
Figure S1. Sketches that illustrate the process for fabricating the grid-like ITO electrodes. The fabrication process includes a sequence of (a) PET substrate with an ITO layer coated with, (b) photoresist patterning and developing on the PET-ITO substrate, (c) etching of ITO and (d) lifting-off the photoresist from the substrate.
Figure S2. Sketches that illustrate the process for fabricating a single all-solid-state TFSC. The fabrication process includes a sequence of (a) photoresist patterning and developing on the PET substrate, (b) Cr/Au current collector sputtering, (c) electrodeposition of 3D Au@MnO 2, (d) lifting-off the photoresist from the substrate, (e) drop casting of LiCl/PVA polymer gel electrolyte and (f) solidification of gel electrolyte.
Figure S3. Output current of the TF-TENG in different sliding velocity. With the increase of the sliding velocity from 0.02 m/s to 0.32 m/s, the measured short-circuit current increases accordingly.
Figure S4. Transmittance spectra of pure FEP, PET-ITO and an assembled TF-TENG. At a wavelength of 550 nm, the transmittances of pure FEP, PET-ITO and assembled TENG are 96.0%, 85.4% and 82.2%, respectively.
Figure S5. SEM images of different 3D Au nanostructures electrodeposited in different ph conditions. (a) ph=3, (b) ph=4, (c) ph=5, (d) ph=6. Scale bar, 1 µm.
Figure S6. Surface topography optimization of the 3D Au nanostructures. (a) CV curves of different 3D Au nanostructures measured in 0.5 M H 2 SO 4 solution in different ph conditions. (a) 2, (b) 3, (c) 4, (d) 5, (e) 6. Potential scan rate: 10 mv/s. (b) Integral areas calculated from the CV curves in different ph conditions. The integral area could reflect the relative surface area of the Au electrode. 1 It s worth noting that the surface area of 3D Au nanostructures modified electrodes obtained at ph 5.0 is significantly larger than those at other ph conditions. Thus, we choose ph 5.0 as the electrochemical deposition condition for the following experiments.
Figure S7. Additional electrochemical performance of a single transparent SC. (a) CV curves of TFSCs at scan rates of 100, 200, 500 and 1000 mv/s. (b) Galvanostatic CC curves of TFSCs at current densities of 20, 30, 40 and 50 µa/cm 2.
Figure S8. Ragone plot of a single TFSC in specific areal energy and power densities.
Figure S9. Supercapacitors with different line width and interspace. Optical microscope images of the TFSCs with (a) line width of 20 µm, interspace of 80 µm, and (b) line width of 30 µm, interspace of 70 µm. Scale bar, 200 µm. (c) Galvanostatic CC curves of TFSCs at current densities of 2 µa/cm 2. (d) The transparency versus specific areal capacitance of the TFSCs with different line width and interspace.
Table S1. Comparison of specific capacitance, transmittance among transparent and flexible supercapacitors based on various materials. a) With the insertion of p-aminophenol, b) specific capacitance of device, c) specific capacitance of electrode materials, d) transmittance of single electrode, e) transmittance of device.
Table S2. Feature extraction of the output current signals after signal analysis. a) Peak of the current signals (na), where n is the number of peak current signals. b) Time interval between two contiguous peak current signals (s), where m is the number of time interval. Video S1. 8 LEDs could be lighten by all-direction motions including both pressing and sliding. Video S2. Intelligent sliding unlock system (ISUS).
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