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-C 4 :DS) and poly(2‐hexyl‐2,3‐dihydrothieno[3,4‐b][1,4]dioxine:dodecyl sulfate (PEDOT-C 6 :DS). The ratio of the DS anion doped into PEDOT-C 4 :DS and PEDOT-C 6 :DS is 0.16 and 0.23, respectively. The contact angle of water on the PEDOT-C 4 :DS and PEDOT-C 6 :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-C 4 :DS and PEDOT-C 6 :DS is stronger than the one of PEDOT:PSS‐CNT composite. GIWAX analysis showed that PEDOT-C 4 :DS formed the highly ordered edge-on structure and PEDOT-C 6 :DS formed the bimodal orientation consisting of edge-on structure mainly and face-on structure slightly. The electrical conductivity (σ PEDOT‐C4:DS =50.0 S cm −1 ) of PEDOT-C 4 :DS is 41.7 times higher than that of PEDOT:PSS (σ PEDOT:PSS =1.2 S cm −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-C 4 :DS) 1.54 V/166.0 nA, and PNG-3 (PEDOT-C 6 :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 to high output power.
Bibliographical noteFunding Information:
This research was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Ministry of Trade, Industry and Energy , Republic of Korea (no. 20153010140030 ) and the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry and Energy , Republic of Korea (No. 20174010201540 ) and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea ( 2018201010636A ).
© 2019 Elsevier Ltd
- Nanofibrillar network
- Piezoelectric nanogenerator
- Poly(3,4-ethylenedioxythiophene) derivative
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- Electrical and Electronic Engineering