title: Reductive exfoliation of substoichiometric MoS2 bilayers using hydrazine salts.
abstract: Substoichiometric molybdenum disulphide (MoSx) nanosheets are successfully synthesised following a novel reductive route using hydrazine salts. The resulting two dimensional crystals are found to be highly monodispersed in thickness, forming exclusively 1.9 ± 0.2 nm thick bilayers. The lateral dimensions of the nanosheets are governed by the precursor bulk particle's size. Exploring a range of hydrazine derivatives with various degrees of steric hindrance leads to the conclusion that intercalation does not occur during the process and that exfoliation is instead facilitated by the reduction of Mo centres leading to the exfoliation of substoichiometric bilayers with distorted lattices. The lattice distortion is found to be persistent across all samples with XPS analysis pointing towards a S to Mo ratio of 1.2. The resulting material features an electronic bandgap of 2.1 eV, which is wider than that of pristine monolayer MoS2 with relatively longer radiative decay time.
authors: School of Engineering, RMIT University, 124 Latrobe Street, 3000 Melbourne, Australia. Torben.Daeneke@rmit.edu.au Kourosh.Kalantar@rmit.edu.au.
authors: Torben
authors: T
authors: Daeneke
authors: School of Engineering, RMIT University, 124 Latrobe Street, 3000 Melbourne, Australia. Torben.Daeneke@rmit.edu.au Kourosh.Kalantar@rmit.edu.au.
authors: Rhiannon M
authors: RM
authors: Clark
authors: School of Engineering, RMIT University, 124 Latrobe Street, 3000 Melbourne, Australia. Torben.Daeneke@rmit.edu.au Kourosh.Kalantar@rmit.edu.au.
authors: Benjamin J
authors: BJ
authors: Carey
authors: School of Engineering, RMIT University, 124 Latrobe Street, 3000 Melbourne, Australia. Torben.Daeneke@rmit.edu.au Kourosh.Kalantar@rmit.edu.au.
authors: Jian Zhen
authors: JZ
authors: Ou
authors: School of Physics & Astronomy, Monash University, 20 Research Way, 3800 Clayton, Australia.
authors: Bent
authors: B
authors: Weber
authors: School of Physics & Astronomy, Monash University, 20 Research Way, 3800 Clayton, Australia.
authors: Michael S
authors: MS
authors: Fuhrer
authors: Functional Materials and Microsystems Research Group, School of Engineering, RMIT University, 124 Latrobe Street, 3000 Melbourne, Australia.
authors: Madhu
authors: M
authors: Bhaskaran
authors: School of Engineering, RMIT University, 124 Latrobe Street, 3000 Melbourne, Australia. Torben.Daeneke@rmit.edu.au Kourosh.Kalantar@rmit.edu.au.
authors: Kourosh
authors: K
authors: Kalantar-Zadeh