ACS Nano
ACS Nano
5 years ago

Enhancing Multifunctionalities of Transition-Metal Dichalcogenide Monolayers via Cation Intercalation

Enhancing Multifunctionalities of Transition-Metal Dichalcogenide Monolayers via Cation Intercalation
Yong-Qing Cai, Lujun Huang, Yiling Yu, Andrew Barrette, Yifei Yu, Kenan Gundogdu, Guoqing Li, Linyou Cao, Yong-Wei Zhang
We have demonstrated that multiple functionalities of transition-metal dichalcogenide (TMDC) monolayers may be substantially improved by the intercalation of small cations (H+ or Li+) between the monolayers and underlying substrates. The functionalities include photoluminescence (PL) efficiency and catalytic activity. The improvement in PL efficiency may be up to orders of magnitude and can be mainly ascribed to two effects of the intercalated cations: p-doping to the monolayers and reducing the influence of substrates, but more studies are necessary to better understand the mechanism for the improvement in the catalytic functionality. The cation intercalation may be achieved by simply immersing substrate-supported monolayers into the solution of certain acids or salts. It is more difficult to intercalate under the monolayers interacting with substrates stronger, such as as-grown monolayers or the monolayers on 2D material substrates. This result presents a versatile strategy to simultaneously optimize multiple functionalities of TMDC monolayers.

Publisher URL: http://dx.doi.org/10.1021/acsnano.7b04880

DOI: 10.1021/acsnano.7b04880

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