Edge and confinement effects allow in situ measurement of size and thickness of liquid-exfoliated nanosheets

Backes C, Smith RJ, McEvoy N, Berner N, McCloskey D, Nerl HC, O'Neill A, King PJ, Higgins T, Hanlon D, Scheuschner N, Maultzsch J, Houben L, Duesberg GS, Donegan JF, Nicolosi V, Coleman JN (2014)

Publication Status: Published

Publication Type: Journal article

Publication year: 2014

Journal

Nature Communications Nature Publishing Group: Nature Communications

Publisher: NATURE PUBLISHING GROUP

Book Volume: 5

DOI: 10.1038/ncomms5576

Abstract

Two-dimensional nanomaterials such as MoS2 are of great interest both because of their novel physical properties and their applications potential. Liquid exfoliation, an important production method, is limited by our inability to quickly and easily measure nanosheet size, thickness or concentration. Here we demonstrate a method to simultaneously determine mean values of these properties from an optical extinction spectrum measured on a liquid dispersion of MoS2 nanosheets. The concentration measurement is based on the size-independence of the low-wavelength extinction coefficient, while the size and thickness measurements rely on the effect of edges and quantum confinement on the optical spectra. The resultant controllability of concentration, size and thickness facilitates the preparation of dispersions with pre-determined properties such as high monolayer-content, leading to first measurement of A-exciton MoS2 luminescence in liquid suspensions. These techniques are general and can be applied to a range of two-dimensional materials including WS2, MoSe2 and WSe2.

Authors with CRIS profile

Janina Maultzsch Lehrstuhl für Experimentalphysik

Involved external institutions

Trinity College Dublin IE Ireland (IE) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE) Technische Universität Berlin DE Germany (DE)

How to cite

APA:

Backes, C., Smith, R.J., McEvoy, N., Berner, N., McCloskey, D., Nerl, H.C.,... Coleman, J.N. (2014). Edge and confinement effects allow in situ measurement of size and thickness of liquid-exfoliated nanosheets. Nature Communications, 5. https://dx.doi.org/10.1038/ncomms5576

MLA:

Backes, Claudia, et al. "Edge and confinement effects allow in situ measurement of size and thickness of liquid-exfoliated nanosheets." Nature Communications 5 (2014).

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