Presentation Information
[16a-PA6-7]Self-Powered Ultra-Violet Index Detection Using TiO2-NFs-blended P(VDF-TrFE) Piezoelectric Nanogenerators
〇(D)ChenYang Tseng1, TzuChuan Yang1, TingHan Lin1, Karthekeyan Periasamy2,3, MingChung Wu1,4, JerChyi Wang1,4,5 (1.Chang Gung Univ., 2.Aalto Univ., 3.Nokia Networks, 4.Linkou CGMH, 5.Ming Chi Univ.)
Keywords:
P(VDF-TrFE),TiO2,Piezoelectric Nanogenerators
TiO2 nanofibers (TiO2-NFs)-blended P(VDF-TrFE) piezoelectric nanogenerators (PENGs) exhibit exceptional ultra-violet (UV) responsiveness and the capability to harvest electrical energy from external mechanical stimuli. Their lightweight nature, cost-effective fabrication, and high energy efficiency position them as promising candidates for portable and self-powered UV detectors. Here, a custom-built UV source was utilized to simulate solar radiation and evaluate the output characteristics of TiO2-NFs-blended P(VDF-TrFE) PENGs (Fig. 1(a)). The SEM image revealed that the TiO2-NFs-blended P(VDF-TrFE) films annealed under 20 mW/cm2 UV intensity (U20) possessed a high-density and elongated needle-like structure (Fig. 1(b)), signifying superior formation of β-phase crystallinity. In the dark environment, the open-circuit voltage (Voc) of the PENGs annealed under different UV intensities was measured under different pressures at a frequency of 2 Hz (Fig. 1(c)), where the U20 sample demonstrated the optimal Voc. Fig. 1(d) presents the short-circuit current (Isc) of the U20 sample under different UV power densities to investigate the photo-response. As the power density increased, the peak Isc exceeded 15 μA. The superior photo-detection behavior could be attributed to the UV-induced electron-hole pairs generated by TiO2-NFs, facilitating the dipole alignment in P(VDF-TrFE) copolymers under the application of pressure. Furthermore, the Voc under different UV Index (UVI) levels was analyzed via an oscilloscope to verify the performance of the self-powered UV photodetector (Fig. 1(e)), where the UVI values can be estimated from the Voc versus UVI correlation. Consequently, the self-powered TiO2-NFs-blended P(VDF-TrFE) PENGs exhibit excellent UV response and self-powered characteristics, showing great potential for future portable UV-assisted devices.