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

Title
Benzyl viologen-assisted simultaneous exfoliation and n-doping of MoS2 nanosheets via a solution process
Authors
김희숙조기영최재유
Issue Date
2017-06
Publisher
Journal of materials chemistry. C, Materials for optical and electronic devices
Citation
VOL 5, NO 22-5401
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 mV 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.
URI
http://pubs.kist.re.kr/handle/201004/70191
ISSN
2050-7526
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KIST Publication > Article
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