Synthesis and characterization of nanofiber-type hydrophobic organic materials as electrodes for improved performance of PVDF-based piezoelectric nanogenerators
- Synthesis and characterization of nanofiber-type hydrophobic organic materials as electrodes for improved performance of PVDF-based piezoelectric nanogenerators
- 강종윤; Eui Jin Ko; Sung Jae Jeon; Yong Woon Han; Se Yeong Jeong; Tae Hyun Sung; Kee Won Seong; Doo Kyung Moon
- Issue Date
- Nano energy
- VOL 58-22
- Poly(3,4-ethylenedioxythiophene) (PEDOT) derivatives are synthesized by oxidative polymerization using sodium dodecyl sulfate (SDS) as an anionic surfactant dopant. The resulting polymeric materials featuring nanofiber-type one-dimensional (1D) structures are identified as poly(2‐ butyl‐ 2,3‐ dihydrothieno[3,4‐ b][1,4]dioxine:dodecyl sulfate (PEDOT-C4:DS) and poly(2‐ hexyl‐ b][1,4]dioxine:dodecyl sulfate (PEDOT-C6:DS). The ratio of the DS anion doped into PEDOT-C4:DS and PEDOT-C6:DS is 0.16 and 0.23, respectively. The contact angle of water on the PEDOT-C4:DS and PEDOT-C6:DS films is 76.6° and 87.7°, respectively, showing hydrophobic properties similar to that with water on PVDF. It facilitated the fully uniform film formation due to excellent surface matching. Peeling force of PEDOT-C4:DS and PEDOT-C6:DS is stronger than the one of PEDOT:PSS‐ CNT composite. GIWAX analysis showed that PEDOT-C4:DS formed the highly ordered edge-on structure and PEDOT-C6:DS formed the bimodal orientation consisting of edge-on structure mainly and face-on structure slightly. The electrical conductivity (σPEDOT‐ C4:DS=50.0  S  cm− 1) of PEDOT-C4:DS is 41.7 times higher than that of PEDOT:PSS (σPEDOT:PSS=1.2  1).
The output signals (maximum voltages/currents) of piezoelectric nanogenerators (PNGs, electrode/PVDF/electrode) using these materials as electrodes are PNG-1 (PEDOT:PSS‐ CNT composite) 1.25  V/128.5  nA, PNG-2 (PEDOT-C4:DS) 1.54  V/166.0  nA, and PNG-3 (PEDOT-C6:DS) 1.49  V/159.0  nA. Of these, PNG-2 & PNG-3 show maximum piezoelectric output power of 63.0  nW and 59.9  nW at 9  MΩ compared to PNG-1 (41.0  nW at 10  MΩ). They are enhanced up to 53.7%. The excellent surface matching between a piezoelectric active material and an electrode material leads t
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