| Recently, electrostatic generators have become a research focus of environment, energy and materials science by virtue of their excellent electrical output and self-powered sensing feature. Electrostatic generator integrated with paper-based device is of great significance for implementing the truly full paper-based electronic system. In this thesis, starting with the review of the progress in the research of paper with the paper basing electronics, electrostatic generators (including triboelectric generators and electret generators) and self-powered sensing applications, we focused on the fabrication, working mechanism, performance characterization and the self-powered sensing applications of the paper-based electret generators. Main work and findings are listed below.1. A paper-based electret generator (PEG) was demonstrated for the first time. We focused on the research of the working mechanism of the PEG in theory, establishing a relation expression of the output performance with the physical parameters and the stimuli, which is of great guiding significance for fabricating a PEG device. Furthermore, the performance characteriazation for the PEG has been carried out, which indicats that PEG has excellent structure stability and loading capacity, with specific performance in:the PEG with a size of 2.5×2 cm2 can power the 70 LEDs in series directly. Furthermore, the integration of the PEG with paper notebook as a strain sensor has been implemented. The results indicate that the PEG can be considered as a self-powered active sensor, perceiving the environment changes caused by micro-mechanical energy and then emitting prompt signal, which is demonstrated for the first time and has potential applications in document and information security protection.2. A novel fabrication method of transparent paper-based electret generator (TPEG) has been developed. A transparent paper together with the transparent paper-based electrodes has been fabricated successfully. A simplified charges transferred model was proposed to analyze the working mechanism of the TPEG, indicating that the alternative electrical signal is generated due to the redistribution of the charges on the both electrodes induced by electrostatic effect. The characterization results present that the TPEG has a high optical transmittance up to 90%, together with excellent electrical output stability and anti-fatigue feature. A TPEG basing transparent self-powered system for arts anti-theft has been demonstrated. Furthermore, a transparent paper-based smart mapping system based on single-mode transparent electret generator has also been fabricated which has potential applications in smart anti-fake and packaging.3. A novel fabrication method of piezoelectret basing paper-based tactile sensor array (PTSA) has been developed. By using the ink printing technique, paper-based electrode patterns have been fabricated. And a biaxially oriented polypropylene film (BOPP) piezoelectret film with excellent piezoelectric performance has also been fabricated by expanding and polarizing the cellular BOPP label film. The piezoelectric mechanism of the BOPP has been intensively studied, and furthermore, a relation expression of the induced charges with thickness of the interior air bubbles has been established, which is of great guiding significance for understanding the working mechanism of the PTSA. Besides, the characterization results show that the PTSA has a robust structure and stable sensing performance as well as higher ability of resisting interference and signal to noise ratio characteristics. A PTSA basing self-powered touch screen as an addressable panel has been also fabricated. The results show that the device not only has excellent signal-to-noise ratio, but also can meet the demand of customized device. Thus the advent of PTSA will push forward a significant step toward the customized shape-adaptable touch device. |
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