4.7 Article

On the interaction between PEDOT:PSS and cellulose: Adsorption mechanisms and controlling factors

Journal

CARBOHYDRATE POLYMERS
Volume 260, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.117818

Keywords

Cellulose; QCM-D; Adsorption; Colloidal probe-AFM; Adhesion

Funding

  1. Vinnova through the Digital Cellulose Centre
  2. Wallenberg Wood Science Centre

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The study revealed that PEDOT:PSS can spontaneously adsorb onto cellulose surfaces, with adsorption amount influenced by solution parameters and driven by entropy gain. Adhesion between cellulose and PEDOT:PSS increases at low pH, with bead-like PEDOT:PSS particles formed on cellulose surfaces under such conditions.
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a conducting polymer frequently used with cellulose, to develop advanced electronic materials. To understand the fundamental interactions between cellulose and PEDOT:PSS, a quartz crystal microbalance with dissipation (QCM-D) was used to study the adsorption of PEDOT:PSS onto model films of cellulose-nanofibrils (CNFs) and regenerated cellulose. The results show that PEDOT:PSS adsorbs spontaneously onto anionically charged cellulose wherein the adsorbed amount can be tuned by altering solution parameters such as pH, ionic strength and counterion to the charges on the CNF. Temperature-dependent QCM-D studies indicate that an entropy gain is the driving force for adsorption, as the adsorbed amount of PEDOT:PSS increased with increasing temperature. Colloidal probe AFM, in accordance with QCM-D results, also showed an increased adhesion between cellulose and PEDOT:PSS at low pH. AFM images show bead-like PEDOT:PSS particles on CNF surfaces, while no such organization was observed on the regenerated cellulose surfaces. This work provides insight into the interaction of PEDOT:PSS/cellulose that will aid in the design of sustainable electronic devices.

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