Brooklyn Technical High School, Brooklyn, New York, New York
October 26, 2018
October 26, 2018
October 27, 2018
A universal laser system (ULS-XLS10MWH) was used to induce graphene onto a polyimide sheet in a specially designed pattern to produce a flexible capacitor. The outline and configuration of the graphene pattern was designed to maximize the surface area the elements and increase capacitance. An epoxy well was fashioned around the center of the capacitor to hold an electrolyte, a mixture of LIOH*H2O/polyvinyl alcohol (PVA) with deionized water, the mixture was thoroughly stirred to for a gel. The electrolyte gel, after being added inside the epoxy well was sealed off by a small piece of Kapton tape. The common leads were then treated with colloidal silver paint to provide maximum contact arear for the copper-tape, which was applied after colloidal silver to create conductive surface and act as electric leads. Completed capacitors had a capacitance ranging between 19-103 nano-farads which would steadily decrease over 24 hours. A charging potential of 3 volts resulted in a discharge time of 80ms. The 3volt charging potential was determined to be high for this particular type of electrolyte. The electrolyte gel was rated to hold 1 volt of charge. By passing larger quantity of voltage through the capacitor resulted in a decrease of its shelf life and number of cycles that the capacitors could be put through. Future work involves further optimizing the design of the capacitor and experimenting with various electrolytes.
Sullivan, A., & Sitbon, R. P., & Marchese, T. M., & Sideris, P., & Lawrence, M., & Marchese, P. J. (2018, October), A Student Research Project to Develop a Graphene-printed Capacitor Paper presented at 2018 Mid Atlantic Section Fall Meeting, Brooklyn Technical High School, Brooklyn, New York, New York. https://strategy.asee.org/31443
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