Electrochemical Synthesis of Micro/nanostructured Poly(3,4-ethylenedioxythiophene) Films with Underwater Superoleophobicity†

doi:10.7503/cjcu20130800

Abstract

Abstract:

Micro/nanostructured poly(3,4-ethylenedioxythiophene)(PEDOT) films were fabricated by an electrochemical polymerization in the presence of ionic liquid(1-hexyl-3methyllimidazolium bromide) as the electrolyte and dopants. The PEDOT films consist of micro-rod structures that encompass the micro-groove structure, and the nano-chain structure arranged inside of the micro-groove structure. The width of micro-grooves and the beads on the nano-chains can be adjusted by changing the current density of polymerization. The results showed that PEDOT chain backbone was doped by both the anion(Br^-) and cation(imidazolium) of ionic liquids. In addition, PEDOT film exhibited reversible electrochemical activity and underwater superoleophobic properties, which could be used for the application of the underwater anti-fouling coating and controlled oil-water separation materials.

Key words: Poly(3, 4-ethylenedioxythiophene) film, Ionic liquid, Micro/nanostructure, Underwater superoleophobicity

CLC Number:

O647
O631

TrendMD:

LIU Zhaoyuan, DING Chunmei, ZHU Ying, WAN Meixiang, JIANG Lei. Electrochemical Synthesis of Micro/nanostructured Poly(3,4-ethylenedioxythiophene) Films with Underwater Superoleophobicity^†[J]. Chem. J. Chinese Universities, 2014, 35(1): 98.

Figures/Tables 7

Fig.1 SEM images of the PEDOT micro/nanostructures prepared at different current densitiesCurrent density/(mA·cm-2): (A)—(C) 0.5; (D)—(F) 0.6; (G)—(I) 0.7; (J)—(L) 0.8.

Fig.2 XPS spectra of PEDOT(A) Full spectrum; (B) C1s spectrum; (C) S2p spectrum.

Fig.3 UV-Vis spectrum of the PEDOT dissolved in DMSO

Fig.4 XRD pattern of PEDOT

Fig.5 SEM images of the micro/nanostructured PEDOT films prepared at different polymerization timePolymerization time/h: (A), (B) 0.5; (C) 1; (D) 2. Current density: 0.5 mA/cm2.

Fig.6 Proposed mechanism for the formation of PEDOT micro/nanostructures

Fig.7 Cyclic voltammogram of PEDOT film with a scanning rate of 50 mV/s(A), photographs of a water droplet on the PEDOT film in air(B, CA=48.3°) and an oil droplet on the PEDOT film under water(C, CA=151.6°)

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