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- Title
Convection‐Flow‐Assisted Preparation of a Strong Electron Dopant, Benzyl Viologen, for Surface‐Charge Transfer Doping of Molybdenum Disulfide.
- Authors
Matsuyama, Keigo; Fukui, Akito; Miura, Kohei; Ichimiya, Hisashi; Aoki, Yuki; Yamada, Yuki; Ashida, Atsushi; Yoshimura, Takeshi; Fujimura, Norifumi; Kiriya, Daisuke
- Abstract
Transition metal dichalcogenides (TMDCs) have received attention as atomically thin post‐silicon semiconducting materials. Tuning the carrier concentrations of the TMDCs is important, but their thin structure requires a non‐destructive modulation method. Recently, a surface‐charge transfer doping method was developed based on contacting molecules on TMDCs, and the method succeeded in achieving a large modulation of the electronic structures. The successful dopant is a neutral benzyl viologen (BV0); however, the problem remains of how to effectively prepare the BV0 molecules. A reduction process with NaBH4 in water has been proposed as a preparation method, but the NaBH4 simultaneously reacts vigorously with the water. Here, a simple method is developed, in which the reaction vial is placed on a hotplate and a fragment of air‐stable metal is used instead of NaBH4 to prepare the BV0 dopant molecules. The prepared BV0 molecules show a strong doping ability in terms of achieving a degenerate situation of a TMDC, MoS2. A key finding in this preparation method is that a convection flow in the vial effectively transports the produced BV0 to a collection solvent. This method is simple and safe and facilitates the tuning of the optoelectronic properties of nanomaterials by the easily‐handled dopant molecules.
- Subjects
MOLYBDENUM disulfide; SEMICONDUCTORS; DOPING agents (Chemistry); ELECTRONIC modulation; CARRIER density; SURFACE charges
- Publication
ChemistryOpen, 2019, Vol 8, Issue 7, p908
- ISSN
2191-1363
- Publication type
Article
- DOI
10.1002/open.201900169