Abstract

Despite the large number of papers on the NH3 doping of graphene, the achievement of stable n-doped large area CVD (chemical vapor deposition) graphene, which is intrinsically p-doped, is still challenging. A control of the NH3 chemisorption and of the N-bond configuration is still needed. Here it is shown the feasibility of a room temperature NH3 high pressure treatment of CVD graphene to achieve n-type doping. We use and correlate data of (a) sheet resistance, Rsh, and Hall coefficient, RH, in Van der Pauw configuration, acquired in real time during the NH3 doping of CVD-graphene on a glass substrate, (b) optical measurements of the effect of doping on the graphene Van Hove singularity point at 4.6 eV in the dielectric function spectra by spectroscopic ellipsometry, and of (c) N-bond configuration by XPS to better understand and, finally, control the NH3 doping of graphene. The discussion is focused on the thermal and time stability of the n-doping after air exposure. A chemical rationale is provided for the NH3 n-doping based on the interaction of (i) NH3 with intrinsic oxygen functionalities and defects of CVD graphene and of (ii) C-NH2 doping centers with acceptor species present in the air.

Autore Pugliese

• Bianco Giuseppe Valerio , Losurdo Maria , Giangregorio Maria Michela

Tutti gli autori

• G.V. Bianco; M. Losurdo; M. M. Giangregorio; P. Capezzuto; G. Bruno

Titolo volume/Rivista

PCCP. Physical chemistry chemical physics

Anno di pubblicazione

2014

ISSN

1463-9076

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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