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2014-05-28 - Colloque/Présentation - poster - Anglais - 1 page(s)

Scardamaglia Mattia, Aleman Llorente Belen, Amati Matteo, Ewels C, Pochet Pascal, Reckinger N., Colomer Jean-François, Skaltsas Theodosis, Tagmatarchis Nikos, Snyders Rony , Gregoratti Luca, Bittencourt Carla , "Nitrogen ion casting of suspended graphene flakes: temperature effects and selectivity of sp2 nitrogen species" in E-MRS Spring 14 Meeting, Lille, France, 2014

  • Codes CREF : Physique de l'état solide (DI1261), Physique des plasmas (DI1233)
  • Unités de recherche UMONS : Chimie des interactions plasma-surface (S882)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Centre d’Innovation et de Recherche en Matériaux Polymères (CIRMAP)

Abstract(s) :

(Anglais) Achive the fine tuning of the graphene electronic properties is one of the main challenges for optimal fabrication of graphene-based nano-devices. Notably the low carrier density in pristine graphene at the Fermi level means that charge carrier doping is very attractive for nanoelectronics applications. Among these, the introduction of nitrogen atoms into the hexagonal carbon lattice of graphene has attracted interest in the recent years. Within this context, we present an experimental report that combines scanning photoemission microscopy analysis with in-situ nitrogen ion casting on suspended graphene. Nitrogen doping was performed by N2 ions bombardment in ultra-high vacuum. Inclusion of up to 20 at. % nitrogen can be reached through this clean technique with absence of oxygen species in the final product, while maintaining a largely sp2-carbon network. The inclusion was observed by scanning X-ray photoelectron microscopy which can be used to follow the evolution of nitrogen species: pyridinic, graphitic, and pyrrolic, at different doping stages and annealing temperatures. Variations in the ratio between sp2 nitrogen species was observed for increasing treatment time; annealing results in quenching of the sp3 component, suggesting graphitic nitrogen as the most thermal stable species. The occurrence of graphitic species together with the absence of pyrrolic is indicative of N-incorporation into a hexagonal graphene-based lattice.