Mechanically Adaptive Mixed Ionic-Electronic Conductors Based on a Polar Polythiophene Reinforced with Cellulose NanofibrilsShow others and affiliations
2023 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 15, no 23, p. 28300-28309Article in journal (Refereed) Published
Abstract [en]
Conjugated polymers with oligoether side chains are promisingmixedionic-electronic conductors, but they tend to feature a low glasstransition temperature and hence a low elastic modulus, which preventstheir use if mechanical robust materials are required. Carboxymethylatedcellulose nanofibrils (CNF) are found to be a suitable reinforcingagent for a soft polythiophene with tetraethylene glycol side chains.Dry nanocomposites feature a Youngs modulus of more than 400MPa, which reversibly decreases to 10 MPa or less upon passive swellingthrough water uptake. The presence of CNF results in a slight decreasein electronic mobility but enhances the ionic mobility and volumetriccapacitance, with the latter increasing from 164 to 197 F cm(-3) upon the addition of 20 vol % CNF. Overall, organic electrochemicaltransistors (OECTs) feature a higher switching speed and a transconductancethat is independent of the CNF content up to at least 20 vol % CNF.Hence, CNF-reinforced conjugated polymers with oligoether side chainsfacilitate the design of mechanically adaptive mixed ionic-electronicconductors for wearable electronics and bioelectronics.
Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2023. Vol. 15, no 23, p. 28300-28309
Keywords [en]
cellulose nanofibrils (CNF); organic mixed ionic-electronicconductors; conjugated polymer; organic electrochemicaltransistor (OECT); chemical doping
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:liu:diva-196091DOI: 10.1021/acsami.3c03962ISI: 001008316500001PubMedID: 37262133OAI: oai:DiVA.org:liu-196091DiVA, id: diva2:1779913
Note
Funding Agencies|Wallenberg Wood Science Center (WWSC); Knut and Alice Wallenberg Foundation through a Wallenberg Scholar grant; European Union [955837]
2023-07-052023-07-052023-12-07