Vapor Phase Polymerization Deposition Conducting Polymer Nanocomposites on Porous Dielectric Surface as High Performance Electrode Materials

Abstract

Abstract:We report chemical vapor phase polymerization (VPP) deposition of poly (3,4-ethylenedioxythiop-hene) (PEDOT) and PEDOT/graphene on porous dielectric tantalum pentoxide (Ta2O5) surface as cathode films for solid tantalum electrolyte capacitors. The modified oxidant/oxidant-graphene films were first deposited on Ta2O5 by dip-coating, and VPP process was subsequently utilized to transfer oxidant/oxidant-graphene into PEDOT/PEDOT-graphene films. The SEM images showed PEDOT/PEDOT-graphene films was successfully constructed on porous Ta2O5 surface through VPP deposition, and a solid tantalum electrolyte capacitor with conducting polymer-graphene nano-composites as cathode films was constructed. The high conductivity nature of PEDOT-graphene leads to resistance decrease of cathode films and lower contact resistance between PEDOT/graphene and carbon paste. This nano-composite cathode films based capacitor showed ultralow equivalent series resistance (ESR) ca. 12 mΩ and exhibited excellent capacitance-frequency performance, which can keep 82% of initial capacitance at 500 KHz. The investigation on leakage current revealed that the device encapsulation process has no influence on capacitor leakage current, indicating the excellent mechanical strength of PEDOT/PEDOT-gaphene films. This high conductivity and mechanical strength of graphene-based polymer films shows promising future for electrode materials such as capacitors, organic solar cells and electrochemical energy storage devices.

Poly(3,4 ethylenedioxythiophene)‐tosylate—Its synthesis, properties and various applications

“…The capacitance of the system increases with the polymerization time (around 1 hour) until a homogeneous PEDOT coating is formed inside the tantalum oxide pores. The observed maximum capacitance of the PEDOT/graphene film is 67.3 μF and loss percentage around 1.7 77 . The tantalum capacitor based on VPP PEDOT/PEDOT‐graphene results ultralow ESR, ca.…”

“…Another composite film PEDOT‐Tos/Graphene was developed on a Ta 2 O 5 covered porous pellet. A FeTos/graphene layer was formed on the porous Ta 2 O 5 pellet and was exposed to the EDOT monomer vapor to form PEDOT‐Tos/Graphene composite film 77 . Further, a rGO/CNTs/PEDOT‐Tos composite film was also fabricated by simple VPP deposition, an oxidant Iron(III) p‐toluene sulfonate hexahydrate (Fe(OTs) 3 ) solution was uniformly applied on to a CNT and rGo solution sprayed substrate which was transferred in to the EDOT vapor chamber for the deposition and polymerization with required condition 78 …”

“…Both the theoretical and experimental studies, via density functional theory and wavefunction based quantum chemical calculations and photoelectron spectroscopy respectively, 57 have explained that the work function decreases by 0.5 eV because the electrons are transferred from TDAE to PEDOT‐Tos surface. In 2013, Yang et al reported a capacitor cathode film of poly(3,4‐ethylenedioxythiophene) (PEDOT)/graphene nanocomposites on a solid porous tantalum pentoxide surface using chemical vapor phase polymerization process 77,82 . The outer layer of (PEDOT)/graphene improved the mechanical strength of the tantalum electrolyte based capacitor cathode.…”

Progress in Research of Flexible MEMS Microelectrodes for Neural Interface

“…In addition, the newly rising nanotechnology and biomedical engineering will open a new gate for the development of flexible MEMS microelectrodes for neural interface. The interdisciplinary research of micro fabrication technology with nanotechnology and biomedical engineering will direct future research [ 92 , 93 , 94 , 95 ]. The combination of these cutting-edge subjects will undoubtedly collide to make great scientific strides and greatly influence people’s daily lives and understandings of the world.…”

Progress in Research of Flexible MEMS Microelectrodes for Neural Interface

“…The interdisciplinary research of micro fabrication technology with nanotechnology and biomedical engineering will lead the future developing orientation [75][76][77][78]. The combination of these cutting-edge subjects will undoubtedly collide to burst shinning sparks and greatly influence people's daily life and understanding of the world.…”