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Issue 22, 2017
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Benzyl viologen-assisted simultaneous exfoliation and n-doping of MoS2 nanosheets via a solution process

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Abstract

Modulating the electrical properties of transition metal dichalcogenides (TMDs) is of fundamental importance for applications in nanoelectronic devices and can be achieved through the exfoliation of a bulk material into nanosheets or controlled doping. In this study, the simultaneous exfoliation and n-doping of a TMD, i.e., MoS2, is achieved for the first time via a solution process using benzyl viologen (BV) and hydrazine. The MoS2 sample exfoliated by the BV molecules has an average thickness of 2.68 nm and a lateral size of 200–900 nm, indicating bi- or tri-layered MoS2 nanosheets. These nanosheets have an electrical conductivity (2.28 × 10−1 S m−1) that is higher by one order of magnitude than that of bulk MoS2 due to the effective n-doping by BV molecules. As a proof of concept, the thermoelectric properties of the exfoliated MoS2–BV nanosheets are characterized, which reveals an enhanced Seebeck coefficient (−360 μV K−1) due to quantum confinement by successful exfoliation. The electrical conductivity and Seebeck coefficient are the highest values among those of MoS2 nanosheets previously prepared by a solution-process. This newly proposed strategy for simultaneous exfoliation and doping can be used to control the electrical properties of MoS2, thus showing great potential for further development of 2D TMD-based electronic and energy devices.

Graphical abstract: Benzyl viologen-assisted simultaneous exfoliation and n-doping of MoS2 nanosheets via a solution process

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Publication details

The article was received on 15 Mar 2017, accepted on 06 May 2017 and first published on 08 May 2017


Article type: Paper
DOI: 10.1039/C7TC01099K
Citation: J. Mater. Chem. C, 2017,5, 5395-5401
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    Benzyl viologen-assisted simultaneous exfoliation and n-doping of MoS2 nanosheets via a solution process

    K. Jo, J. Choi and H. Kim, J. Mater. Chem. C, 2017, 5, 5395
    DOI: 10.1039/C7TC01099K

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