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

Wang B, Engelhardt V, Roth AM, Faust R, Guldi DM (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Nanoscale Royal Society of Chemistry

Book Volume: 9

Pages Range: 11632-11639

Journal Issue: 32

DOI: 10.1039/c7nr03379f

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.

Authors with CRIS profile

Bingzhe Wang Lehrstuhl für Physikalische Chemie I Alexandra Marina Roth Lehrstuhl für Physikalische Chemie I Dirk Michael Guldi Lehrstuhl für Physikalische Chemie I

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials (EAM)

Involved external institutions

Universität Kassel DE Germany (DE)

How to cite

APA:

Wang, B., Engelhardt, V., Roth, A.M., Faust, R., & Guldi, D.M. (2017). n- versus p-doping of graphite: what drives its wet-chemical exfoliation? Nanoscale, 9(32), 11632-11639. https://doi.org/10.1039/c7nr03379f

MLA:

Wang, Bingzhe, et al. "n- versus p-doping of graphite: what drives its wet-chemical exfoliation?" Nanoscale 9.32 (2017): 11632-11639.

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