Type

Journal Article

Authors

Jonathan N Coleman
Christoph Gadermaier
Werner J Blau
Mikhail I Katsnelson
Elton J G Santos
Damien Hanlon
Pei-Liang Zhao
Ben R Davies
Victor Vega-Mayoral
Shengjun Yuan
and 3 others

Subjects

Engineering

Topics
production size centrifugation dispersions monolayer exfoliated nanosheets estimation processing techniques

Production of Highly Monolayer Enriched Dispersions of Liquid-Exfoliated Nanosheets by Liquid Cascade Centrifugation. (2016)

Abstract While liquid exfoliation is a powerful technique to produce defect-free nanosheets in large quantities, its usefulness is limited by broad nanosheet thickness distributions and low monolayer contents. Here we demonstrate liquid processing techniques, based on iterative centrifugation cascades, which can be designed to achieve either highly efficient nanosheet size-selection and/or monolayer enrichment. The resultant size-selected dispersions were used to establish quantitative metrics to determine monolayer volume fraction, as well as mean nanosheet size and thickness, from standard spectroscopic measurements. Such metrics allowed us to design and optimize centrifugation cascades to enrich liquid exfoliated WS2 dispersions up to monolayer contents of 75%. Monolayer-rich dispersions show relatively bright photoluminescence with narrow line widths (<35 meV) indicating the high quality of the nanosheets. The enriched dispersions display extinction spectra with distinct features, which also allow the direct estimation of monolayer contents.
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Full list of authors on original publication

Jonathan N Coleman, Christoph Gadermaier, Werner J Blau, Mikhail I Katsnelson, Elton J G Santos, Damien Hanlon, Pei-Liang Zhao, Ben R Davies, Victor Vega-Mayoral, Shengjun Yuan and 3 others

Experts in our system

1
Jonathan Coleman
Trinity College Dublin
Total Publications: 217
 
2
Werner Blau
Trinity College Dublin
Total Publications: 109
 
3
Damien Hanlon
Trinity College Dublin
Total Publications: 13
 
4
Victor Vega-Mayoral
Trinity College Dublin
Total Publications: 3