Jump to main content
Jump to site search


n- versus p-doping of graphite: what drives its wet-chemical exfoliation?

Author affiliations

Abstract

We have performed the syntheses of a novel pyrene-porphyrazine conjugate (ZnPzPy) and a reference porphyrazine (ZnPz) to promote the wet-chemical exfoliation of graphite based on the synergetic use of ultrasonication, centrifugation, and doping. ZnPzPy features, on one hand, a hydrophobic pyrene to anchor onto the basal plane of graphene, and, on the other hand, an amphoteric porphyrazine to either p- or n-dope graphene. To this end, we have characterized individual building blocks, that is, ZnPzPy and exfoliated graphite, and the resulting electron donor–acceptor nanohybrid, that is, ZnPzPy/graphene (ZnPzPy-G), by means of an arsenal of microscopic and spectroscopic techniques. From a full-fledged characterization we conclude that ZnPzPy facilitates the exfoliation of graphite affording suspensions featuring 9.5% of single- or few-layered ZnPzPy-G with a mean average size of 200 ± 140 nm. Importantly, a notable shift of charge density from graphene to ZnPzPy in the ground state of ZnPzPy-G corroborates the preference of exfoliated graphite to undergo p-doping rather than n-doping. As an immediate consequence, a full charge separation leads in the excited state to a 750 ± 150 ps lived charge separated state.

Graphical abstract: n- versus p-doping of graphite: what drives its wet-chemical exfoliation?

Back to tab navigation

Supplementary files

Publication details

The article was received on 12 May 2017, accepted on 10 Jul 2017 and first published on 11 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR03379F
Citation: Nanoscale, 2017, Advance Article
  •   Request permissions

    n- versus p-doping of graphite: what drives its wet-chemical exfoliation?

    B. Wang, V. Engelhardt, A. Roth, R. Faust and D. M. Guldi, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR03379F

Search articles by author

Spotlight

Advertisements