Stretchable Self-Healing Polymeric Dielectrics Cross-Linked Through Metal–Ligand Coordination
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No Canadian affiliation. An affiliation-only frame — the usual design — would never have seen this work. It is one of the works that make the case for inverting the frame.
Machine scores (provisional)
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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- Teacher spread
- 0.240 · how far apart the two teachers sit on this one work
- Validation status
score_only:v0-immature-baseline· verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it
Abstract
A self-healing dielectric elastomer is achieved by the incorporation of metal-ligand coordination as cross-linking sites in nonpolar polydimethylsiloxane (PDMS) polymers. The ligand is 2,2'-bipyridine-5,5'-dicarboxylic amide, while the metal salts investigated here are Fe(2+) and Zn(2+) with various counteranions. The kinetically labile coordination between Zn(2+) and bipyridine endows the polymer fast self-healing ability at ambient condition. When integrated into organic field-effect transistors (OFETs) as gate dielectrics, transistors with FeCl2 and ZnCl2 salts cross-linked PDMS exhibited increased dielectric constants compared to PDMS and demonstrated hysteresis-free transfer characteristics, owing to the low ion conductivity in PDMS and the strong columbic interaction between metal cations and the small Cl(-) anions which can prevent mobile anions drifting under gate bias. Fully stretchable transistors with FeCl2-PDMS dielectrics were fabricated and exhibited ideal transfer characteristics. The gate leakage current remained low even after 1000 cycles at 100% strain. The mechanical robustness and stable electrical performance proved its suitability for applications in stretchable electronics. On the other hand, transistors with gate dielectrics containing large-sized anions (BF4(-), ClO4(-), CF3SO3(-)) displayed prominent hysteresis due to mobile anions drifting under gate bias voltage. This work provides insights on future design of self-healing stretchable dielectric materials based on metal-ligand cross-linked polymers.
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The record
- Venue
- Journal of the American Chemical Society
- Topic
- Advanced Sensor and Energy Harvesting Materials
- Field
- Engineering
- Canadian institutions
- —
- Funders
- Air Force Office of Scientific ResearchNational Center for Research ResourcesNational Institute of General Medical SciencesDirectorate-General for Research and InnovationSamsungSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungGovernment of CanadaGeneralitat de CatalunyaNatural Sciences and Engineering Research Council of CanadaEuropean Commission
- Keywords
- DielectricPolydimethylsiloxaneChemistryPolymerMetalLigand (biochemistry)ElastomerBipyridineTransistorNanotechnologyPolymer chemistryOptoelectronicsMaterials scienceOrganic chemistryVoltageElectrical engineeringCrystal structureReceptor
- Has abstract in OpenAlex
- yes