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also avoids the inherent clogging issue in inkjet printing and aerosol jet printing by achieving comparable resolution with a much larger nozzle.220 E-jet printing has great potential in high-resolution electronics printing and has been successfully used to print various materials including conductive inks,220, 221 DNA,222 quantum dots,223 and small organic molecules.224 However, conventional HV power sources required for the process generally have high cost and pose major threats to substrates, surrounding instruments and operation personnel. In this work, we managed to use TENG to drive the e-jet printing process. A rotary freestanding TENG (RF-TENG)23, 94 connected with a simple boost circuit211 could supply an open-circuit DC voltage above 1 kV, which was adequate to induce continuous droplet formation and ejection from the printing nozzle. The droplet jetting process was recorded using a high-speed camera with a variable frame rate up to 37350 fps, clearly showing the tunability of jetting frequency via the control of TENG operation frequency. Effects of nozzle moving speed and nozzle size on printed features at different TENG rotation speeds were studied as well. The TENG-driven e-jet printing setup was able to achieve feature sizes smaller than the nozzle diameters, with a minimum feature size of 135 μm using a nozzle diameter of 160 μm in our experiments without dedicated optimization of printing parameters. This performance is comparable to that using a commercial DC HV power source and the resolution is expected to be further improved by reducing the nozzle size and optimizing the nozzle-to-substrate distance. We also demonstrated its use for printing graphic arts, conductive interconnects and touch sensors. The TENG was simply operated using a rotary motor and the cost of the TENG device and boost circuit is less than 100 USD, while a commercial DC HV power source usually costs much more. With the merits 137PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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