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Title

Conjugated polymer nanoparticle-graphene oxide charge-transfer complexes

AuthorsIstif, Emin CSIC ORCID; Hernández-Ferrer, Javier CSIC ORCID; Urriolabeitia, Esteban P. CSIC ORCID; Stergiou, Anastasios; Tagmatarchis, Nikos; Fratta, Giuseppe; Large, Matthew J.; Dalton, Alan B.; Benito, Ana M. CSIC ORCID ; Maser, Wolfgang K. CSIC ORCID
KeywordsConjugated polymers
Nanoparticles
Graphene oxide
Self-assembly
Charge-transfer complexes
Issue Date17-Apr-2018
PublisherWiley-VCH
CitationAdvanced Functional Materials 28(23): 1707548 (2018)
AbstractThe game-changing role of graphene oxide (GO) in tuning the excitonic behavior of conjugated polymer nanoparticles is described for the first time. This is demonstrated by using poly(3-hexylthiophene) (P3HT) as a benchmark conjugated polymer and employing an in-situ re-precipitation approach resulting in P3HT nanoparticles (P3HTNPs) with sizes of 50 - 100 nm in intimate contact with GO. During the self-assembly process, GO changes the crystalline packing of P3HT chains in the forming P3HTNPs from H to H/J aggregates exhibiting exciton coupling constants as low as 2 meV, indicating favorable charge separation along the P3HT chains. Concomitantly, π-π interface interactions between the P3HTNPs and GO sheets are established resulting in the creation of P3HTNPs-GO charge-transfer complexes whose energy bandgaps are lowered by up to 0.5 eV. Moreover, their optoelectronic properties, pre-established in the liquid phase, are retained when processed into thin films from the stable aqueous dispersions, thus eliminating the critical dependency on external processing parameters. These results can be transferred to other types of conjugated polymers. Combined with the possibility of employing water based “green” processing technologies, charge-transfer complexes of conjugated polymer nanoparticles and GO open new pathways for the fabrication of improved optoelectronic thin film devices.
Publisher version (URL)http://dx.doi.org/10.1002/adfm.201707548
URIhttp://hdl.handle.net/10261/163859
DOI10.1002/adfm.201707548
ISSN1616-301X
ReferencesColom, E.; Istif, Emin; González Domínguez, José Miguel; Hernández-Ferrer, Javier; Benito, Ana M.; Maser, Wolfgang K.P3HT aggregation tuned by synergic interaction with different carbon nanostructures. http://hdl.handle.net/10261/227512
Istif, Emin; Hernández-Ferrer, Javier; Urriolabeitia, Esteban P. ; Stergiou, Anastasios; Tagmatarchis, Nikos; Fratta, Giuseppe; Large, Matthew J.; Dalton, Alan B.; Benito, Ana M. ; Maser, Wolfgang K. Conjugated polymer nanoparticle-graphene oxide charge-transfer complexes. http://hdl.handle.net/10261/187497
Hernández-Ferrer, Javier; Istif, Emin; Ansón Casaos, Alejandro; Santidrián, Ana; Benito, Ana M.; Maser, Wolfgang K. Assessment of charge transfer phenomena in nanostructured composite materials using photoelectrochemical methods. http://hdl.handle.net/10261/227192
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