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HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS

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HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS ( high-performance-triboelectric-nanogenerator-and-its-applica )

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make it hydrophobic with a contact angle of 126°and more resistant to moisture and dirt, further improving device stability. Figure 42. The triboelectric-key-based numeric keypad. (a) Comparison of electrical outputs from our triboelectric key and a reference key without shield electrode. Our key with shield electrode yields a one-magnitude-larger SINR. (b) The relationship between the maximum output voltage from our triboelectric key and the typing force. The responses can be categorized into three different regions, open-gap, closed-gap and saturation, depending on the different contact statuses between the top and bottom parts of the key. (c) The capacitor-based voltage-dividing scheme to transform the key output signals to be compatible with common ADCs. Three labelled stages correspond to the pressing, hold and releasing of the key during normal typing. (d) Equivalent electrical circuit for a keystroke device consisting of multiple triboelectric keys. (e) Electrical signals from the fabricated numeric keypad by sequentially inputting the digits “8-3-7-5-0-9-2-4-1-6”. Reproduced with permission.151 Copyright 2018, Elsevier. The detection of keystrokes on a keypad/keyboard is realized through multichannel measurement, which is typically handled by a multichannel analog-to-digital converter 113

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