The ability to control the charge-potential landscape at solid-liquid interfaces is pivotal to engineer novel devices for applications in sensing, catalysis and energy conversion. The isoelectric point (pI)/point of zero charge (pzc) of graphene plays a key role in a number of physico-chemical phenomena occurring at the graphene-liquid interface. Supported by theory, we present here a methodology to identify the pI/pzc of (functionalized) graphene, which also allows for estimating the nature and extent of ion adsorption. The pI of bare graphene (as-prepared, chemical vapor deposition (CVD)-grown) is found to be less than 3.3, which we can continuously modify up to 7.5 by non-covalent electrochemical attachment of aromatic amino groups, preserving the favorable electronic properties of graphene throughout. Modelling all the observed results with detailed theory, we also show that specific adsorption of ions and the substrate play only an ancillary role in our capability to tune the pI of graphene.

Zuccaro, L., Krieg, J., Desideri, A., Kern, K., Balasubramanian, K. (2015). Tuning the isoelectric point of graphene by electrochemical functionalization. SCIENTIFIC REPORTS, 5(1), 11794 [10.1038/srep11794].

Tuning the isoelectric point of graphene by electrochemical functionalization

ZUCCARO, LAURA;DESIDERI, ALESSANDRO;
2015-01-01

Abstract

The ability to control the charge-potential landscape at solid-liquid interfaces is pivotal to engineer novel devices for applications in sensing, catalysis and energy conversion. The isoelectric point (pI)/point of zero charge (pzc) of graphene plays a key role in a number of physico-chemical phenomena occurring at the graphene-liquid interface. Supported by theory, we present here a methodology to identify the pI/pzc of (functionalized) graphene, which also allows for estimating the nature and extent of ion adsorption. The pI of bare graphene (as-prepared, chemical vapor deposition (CVD)-grown) is found to be less than 3.3, which we can continuously modify up to 7.5 by non-covalent electrochemical attachment of aromatic amino groups, preserving the favorable electronic properties of graphene throughout. Modelling all the observed results with detailed theory, we also show that specific adsorption of ions and the substrate play only an ancillary role in our capability to tune the pI of graphene.
2015
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore BIO/11 - BIOLOGIA MOLECOLARE
Settore BIO/10 - BIOCHIMICA
English
Zuccaro, L., Krieg, J., Desideri, A., Kern, K., Balasubramanian, K. (2015). Tuning the isoelectric point of graphene by electrochemical functionalization. SCIENTIFIC REPORTS, 5(1), 11794 [10.1038/srep11794].
Zuccaro, L; Krieg, J; Desideri, A; Kern, K; Balasubramanian, K
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/185113
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