English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/182655
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:


On-surface synthesis and characterization of polyaniline oligomers

AuthorsRuiz del Árbol, Nerea ; Sánchez-Sánchez, Carlos ; Otero-Irurueta, G.; Martínez, José I. ; Andrés, Pedro L. de ; Merino, Pedro ; Piantek, Marten; Serrate, David; López, María Francisca ; Martín-Gago, José A.
Issue Date2018
CitationFuerzas y Túnel (2018)
AbstractPolyaniline (PANI) has been studied since 1835 because of its interest as inherently conducting polymer due to its wide range of potential applications that range from batteries to biosensors. The interest of PANI lies on its capability to express different properties depending on its nitrogen oxidation state: leucoemeraldine (the fully reduced form), emeraldine (the half-oxidized form), and pernigraniline (the fully oxidized form). There are two conventional synthesis methods, electrochemical processing and chemical oxidative polymerization of aniline in a wet environment. Although doped emeraldine structure present good conductivity, it has been shown that the size, the preparation method and the existence of a metal-polymer interface, influence the physical properties of the final PANI. Here, we present a new route to synthesize 1D oligomers of PANI based on a specific on-surface synthesis process. The synthesis was carried out using p-aminophenol (p-Ap) molecules as building blocks on a Pt(111) single-crystal in a UHV environment. At 200°C p-Ap molecules are activated inducing a shift base reaction resulting in oligomer chains with pernigraniline structure. The mechanism of the chemical reaction was followed by XPS, LT-STM/STS and nc-AFM and confronted with theoretical calculations. XPS show that oxygen is removed from the p-AP molecule resulting in a coupling of the precursors via the nitrogen. STM and nc-AFM reveals that oligomers are formed by ca. 10 molecular precursors. STS shows the presence of two broad unoccupied electronic states around 200 mV and 650 mV above the Fermi level that we are able to resolve spatially. Finally, DFT calculations show that the atomic structure is influenced by the substrate crystallography.
DescriptionResumen del póster presentado a la Conferencia bienal Fuerzas y Túnel, celebrada en Jaca (España) del 27 al 29 de junio de 2018.
Appears in Collections:(ICMM) Comunicaciones congresos
(ICMA) Comunicaciones congresos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
Show full item record
Review this work

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.