Structural factors controlling size reduction of graphene oxide in liquid processing

Nacken T, Halbig CE, Wawra S, Damm C, Romeis S, Walter J, Tehrani MJ, Hu Y, Ishii Y, Eigler S, Peukert W (2017)

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2017

Journal

Carbon Elsevier

Publisher: Elsevier Ltd

Book Volume: 125

Pages Range: 360-369

DOI: 10.1016/j.carbon.2017.09.066

Abstract

Graphene oxide materials can be prepared in manifold synthesis approaches and allow for further post-functionalization to adopt the properties of the desired application. Small sized sheets with lateral dimensions on the 100 nm scale are e.g. beneficial for cell applications. Breakage of sheets by liquid phase processing is an ideal way to generate such nano-sized sheets. However, until now it is unknown how functionalization influences the breakage behavior. We have chosen single layered oxo-functionalized graphene (oxo-G) derivatives with lattice defects < 1% to evaluate their size reduction rate upon ultrasonication of flakes with respect to the type and degree of functionalization of the graphene sheets. Lateral dimensions of the processed sheets were quantitatively determined in solution by analytical ultracentrifugation. The highest size reduction rate is observed for pristine oxo-G, which bears the highest degree of functionalization of around 60% and the negatively charged organosulfate group. Partial hydrolysis of organosulfate, or conversion of surface-functional groups to hydroxyl-groups in majority or partial defunctionalization lead to size-reduction rates which are up to 25% lower in comparison with the initial oxo-G. Moreover, the size reduction rate can be correlated in first approximation also with UV--vis spectroscopy.

Authors with CRIS profile

Thomas Nacken Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Simon Wawra Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Cornelia Damm Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Stefan Romeis Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Johannes Walter Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Wolfgang Peukert Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials

Involved external institutions

Freie Universität Berlin DE Germany (DE) University of Illinois at Urbana-Champaign US United States (USA) (US)

How to cite

APA:

Nacken, T., Halbig, C.E., Wawra, S., Damm, C., Romeis, S., Walter, J.,... Peukert, W. (2017). Structural factors controlling size reduction of graphene oxide in liquid processing. Carbon, 125, 360-369. https://dx.doi.org/10.1016/j.carbon.2017.09.066

MLA:

Nacken, Thomas, et al. "Structural factors controlling size reduction of graphene oxide in liquid processing." Carbon 125 (2017): 360-369.

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