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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Backes C,Smith RJ,McEvoy N,Berner NC,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 JNdoi
10.1038/ncomms5576subject
Has Abstractpub_date
2014-08-07 00:00:00pages
4576issn
2041-1723pii
ncomms5576journal_volume
5pub_type
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