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Triboelectric nanogenerator (TENG) is a direct measure of the surface charge density, thus providing a novel and powerful tool to study the essential mechanism of contact electrification (CE). A variety of TENGs including a Pt‐Al2O3 TENG, Au‐Al2O3 TENG, Ti‐Al2O3 TENG, Al‐Al2O3 TENG, and SiO2‐Al2O3 TENG are prepared in this study. After introducing initial charges on the Al2O3 surface of the TENGs,...
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