Research ArticleBIOENGINEERING

Enhanced PEDOT adhesion on solid substrates with electrografted P(EDOT-NH2)

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Science Advances  03 Mar 2017:
Vol. 3, no. 3, e1600448
DOI: 10.1126/sciadv.1600448
  • Fig. 1 Schematic representation of the adhesion-promoting layer.

    (A) PEDOT deposition on solid substrates. (B) PEDOT deposition on the electrografted P(EDOT-NH2) layer.

  • Fig. 2 Wide potential scan in EDOT-NH2 solution.

    (A) Pt in EDOT-NH2 acetonitrile solution with 0.1 M tetrabutylammonium perchlorate (TBAP) as electrolyte (black solid line); Pt in 0.1 M TBAP acetonitrile supporting electrolyte (red dashed line). (B) ITO in EDOT-NH2 acetonitrile solution with 0.1 M TBAP as electrolyte (black solid line); ITO in 0.1 M TBAP acetonitrile supporting electrolyte (red dashed line). Potential was plotted against the Ag/AgCl pseudoreference electrode (−0.48 V versus ferrocene E1/2).

  • Scheme 2 Proposed electrografting mechanism of amines, adopted from Collazos-Castro et al. (17).
  • Fig. 3 P(EDOT-NH2) film coated on ITO.

    (A) Optical micrograph of the film edge. (B) UV-vis–near-infrared (NIR) spectrum of the film. (C) Fourier transform IR (FTIR) spectra of the EDOT monomer, the EDOT-NH2 monomer, and the P(EDOT-NH2) film.

  • Fig. 4 XPS of (A) bare ITO and (B) EDOT-NH2–coated ITO.
  • Fig. 5 SEM images of P(EDOT-NH2) films deposited at different charge densities.

    Scale bars, 5 μm.

  • Fig. 6 Electroactivity of P(EDOT-NH2) on platinum electrodes.

    (A) Impedance spectra of EDOT-NH2 coatings at different deposition charge densities. (B) Impedance spectra of EDOT-NH2 coatings at different depostion charge densities. (C) Charge storage capacity (CSC) of P(EDOT-NH2) coating at different deposition charge densities.

  • Fig. 7 SEM images of PEDOT of different deposition charge densities deposited on P(EDOT-NH2) with the same deposition charge density (72 mC/cm2).

    The insets show the optical image of the depositions on ITO (7 mm wide). Scale bars, 10 μm.

  • Fig. 8 PEDOT and PEDOT-P(EDOT-NH2) depositions on microelectrodes.

    (A) Optical micrograph of (i) bare NeuroNexus electrodes, (ii) PEDOT-coated electrodes, and (iii) PEDOT on EDOT-NH2–modified electrodes. Scale bar, 100 μm. (B) Average impedance spectra of PEDOT, P(EDOT-NH2), PEDOT on P(EDOT-NH2), and bare electrodes. (C) Impedance magnitude at 1 kHz of the three polymer coatings and the bare electrodes. (D) CV of PEDOT, PEODT on P(EDOT-NH2), and bare electrodes. (E) CSC of PEDOT, PEDOT on P(EDOT-NH2), and bare electrodes.

  • Fig. 9 Electrochemical stability of PEDOT on P(EDOT-NH2).

    (A) Impedance spectra of 72-mC/cm2 PEDOT on 72-mC/cm2 P(EDOT-NH2)coated ITO before and after 100, 200, and 300 cycles of CV scans. (B) CV changes during scanning.

  • Fig. 10 Ultrasonication tests on PEDOT films.

    (A) PEDOT coating on ITO before (left) and after (right) 5 s of ultrasonication. (B) PEDOT on P(EDOT-NH2)–modified ITO before (left) and after (right) 1 hour of ultrasonication. The width of the ITO glass slides is 0.7 cm.

  • Scheme 1 Synthesis route of 2-aminomethyl EDOT (EDOT-NH2).

    Conditions: 1: p-toluenesulfonic acid, toluene, 90°C, 16 hours; 2: NaN3, DMF (N,N′-dimethylformamide), room temperature (RT), 17 hours; 3: triphenylphosphine, NaOH, 50°C.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/3/3/e1600448/DC1

    fig. S1. Cross section of P(EDOT-NH2) deposited on ITO.

    fig. S2. PEDOT deposition at 72 mC/cm2 on P(EDOT-NH2) anchoring layers that have different thicknesses.

    fig. S3. Scratch tests on PEDOT on ITO and PEDOT on P(EDOT-NH2)–modified ITO surface.

  • Supplementary Materials

    This PDF file includes:

    • fig. S1. Cross section of P(EDOT-NH2) deposited on ITO.
    • fig. S2. PEDOT deposition at 72 mC/cm2 on P(EDOT-NH2) anchoring layers that have different thicknesses.
    • fig. S3. Scratch tests on PEDOT on ITO and PEDOT on P(EDOT-NH2)–modified ITO surface.

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