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demonstrated on the fabricated emitter, with the electric outputs carefully characterized. As driven by TENG, the voltage and the charge amount per cycle can be controlled precisely through the choice of the operation parameters, which can produce emission of electrons “as demanded”. The limited amount of charge delivered by TENG can also prevent the ZnO nanostructures from exfoliating off from the substrate, which enhances the stability of the system. A unidirectional continuous field emission was achieved through rectifying circuits. The tribo-field emission display was demonstrated by a modified commercial cathode ray tube (CRT), with more than 100 mins illumination achieved by only one sliding motion. Such results open a new era for the development of cost-effective, controllable, stable, and portable field-emission systems. 5.3.1 Tribo-Field Emission The setup for the field emission measurement is shown in Figure 57a. The emitter was fabricated by two pieces of highly-doped conductive Si substrates with grown ZnO NW arrays facing to each other. These ZnO NWs were hydrothermally grown on the pre- deposited ZnO film on the two Si substrates, each with an effective area of 1 cm ×1 cm. Through SEM, these NWs were characterized with < 50 nm in the tip thickness and 1-2 μm in length (Figure 57b inset). Kapton double-side tapes with thickness of 25 μm were used as spacers to separate the two substrates. This emitter was placed in a vacuum chamber with a pressure of < 10-6 torr. TENG or commercially available DC HV source was connected to the backsides of the Si substrates to supply the HV required. The voltage and current/charge transfer were measured by electrometers separately. 151PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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