Fig. 2: Characterization of freeze-dried sulfonated alginate-doped PEDOT polymers. | Nature Communications

Fig. 2: Characterization of freeze-dried sulfonated alginate-doped PEDOT polymers.

From: Boosting hydrogel conductivity via water-dispersible conducting polymers for injectable bioelectronics

Fig. 2

a Polymerization and doping of PEDOT. The AlgS samples are labeled as AlgSx where x represents the % w/v concentration of CSA used in sulfonation reaction. b UV-vis spectra of PEDOT:AlgS2 at different polymerization times. EDOT 3,4-ethylenedioxythiophene, APS ammonium persulfate. The inset shows the absorbance of PEDOT:AlgS reaction solutions at 800 nm before freeze-drying. Data in the inset is presented as mean ± standard deviation. c Effect of alginate sulfonation on the molecular weight distribution of freeze-dried PEDOT:AlgS2 tested via size-exclusion chromatography (SEC) (PEDOT polymerized for 1 d). d Freeze-dried PEDOT forming large aggregates when doped with PSS while doping with AlgS2 results in homogeneously distributed small nanoparticles. e Scanning electron microscopy (SEM) images of freeze-dried PEDOT:AlgS2 and PEDOT:PSS. Values represent the mean (n = 3 independent samples).

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