Ultrafast charge dynamics in dispersions of monolayer MoS2 nanosheets

Kime, G; Leontiadou, M; Brent, JR; Savjani, N; O'Brien, P; Binks, D

Abstract

Ultrafast charge dynamics in dispersions of MoS2 nanosheets in N-methyl-2-pyrrolidone are reported. Samples were prepared by the ultrasonication-assisted exfoliation of MoS2 powder, resulting in nanosheets that were predominantly monolayer and had an average sheet size of 32.4 ± 0.1 nm. These dispersions were characterized using absorption and photoluminescence spectroscopy, transient photoluminescence measurements, and atomic force microscopy before the ultrafast charge dynamics were studied via transient absorption spectroscopy. The transient absorption spectra exhibited bleach peaks and photoinduced absorption peaks in spectral regions corresponding to both the A and B excitons of MoS2. The growth and decay of the features in the B exciton region were determined largely by the dynamics of the exciton population, while the features in the A exciton region depend on the dynamics of both excitons and trions.

Citation

Kime, G., Leontiadou, M., Brent, J., Savjani, N., O'Brien, P., & Binks, D. (2017). Ultrafast charge dynamics in dispersions of monolayer MoS2 nanosheets. Journal of Physical Chemistry C, 121, 22415-22421. https://doi.org/10.1021/acs.jpcc.7b05631

• Journal Article Type: Article
• Online Publication Date: Sep 18, 2017
• Publication Date: Sep 18, 2017
• Deposit Date: Apr 1, 2019
• Journal: Journal of Physical Chemistry C
• Print ISSN: 1932-7447
• Publisher: American Chemical Society
• Volume: 121
• Pages: 22415-22421
• DOI: https://doi.org/10.1021/acs.jpcc.7b05631
• Publisher URL: https://doi.org/10.1021/acs.jpcc.7b05631
• Related Public URLs: https://pubs.acs.org/journal/jpccck
• Additional Information: Funders : Engineering and Physical Sciences Research Council (EPSRC); Grant Number: EP/K008544/1; Grant Number: EP/L01548X/1