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Electrical Characteristics of Molybdenum Disulfide Flakes Produced by Liquid Exfoliation
Lee, Kangho,Kim, Hye‐,Young,Lotya, Mustafa,Coleman, Jonathan N.,Kim, Gyu‐,Tae,Duesberg, Georg S. WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.36
<P><B>Semiconducting 2D MoS<SUB>2</SUB> flakes produced by liquid phase exfoliation</B> are contacted with metal electrodes, which are defined by electron beam lithography. Electrical analysis of the metal–semiconductor–metal structures reveals high mobilities for individual MoS<SUB>2</SUB> flakes. Thus, scalable liquid‐phase exfoliation of layered semiconductor compounds can yield novel materials with potential uses in future electronic devices.</P>
Optimized single-layer MoS<sub>2</sub> field-effect transistors by non-covalent functionalisation
Kim, HyunJeong,Kim, WungYeon,O'Brien, Maria,McEvoy, Niall,Yim, Chanyoung,Marcia, Mario,Hauke, Frank,Hirsch, Andreas,Kim, Gyu-Tae,Duesberg, Georg S. The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.37
<P>Field-effect transistors (FETs) with non-covalently functionalised molybdenum disulfide (MoS2) channels grown by chemical vapour deposition (CVD) on SiO2 are reported. The dangling-bond-free surface of MoS2 was functionalised with a perylene bisimide derivative to allow for the deposition of Al2O3 dielectric. This allowed the fabrication of top-gated, fully encapsulated MoS2 FETs. Furthermore, by the definition of vertical contacts on MoS2, devices, in which the channel area was never exposed to polymers, were fabricated. The MoS2 FETs showed some of the highest mobilities for transistors fabricated on SiO2 with Al2O3 as the top-gate dielectric reported so far. Thus, gate-stack engineering using innovative chemistry is a promising approach for the fabrication of reliable electronic devices based on 2D materials.</P>
Two-Dimensional Nanosheets Produced by Liquid Exfoliation of Layered Materials
Coleman, J. N.,Lotya, M.,O'Neill, A.,Bergin, S. D.,King, P. J.,Khan, U.,Young, K.,Gaucher, A.,De, S.,Smith, R. J.,Shvets, I. V.,Arora, S. K.,Stanton, G.,Kim, H.-Y.,Lee, K.,Kim, G. T.,Duesberg, G. S.,H American Association for the Advancement of Scienc 2011 Science Vol.331 No.6017
<P>If they could be easily exfoliated, layered materials would become a diverse source of two-dimensional crystals whose properties would be useful in applications ranging from electronics to energy storage. We show that layered compounds such as MoS(2), WS(2), MoSe(2), MoTe(2), TaSe(2), NbSe(2), NiTe(2), BN, and Bi(2)Te(3) can be efficiently dispersed in common solvents and can be deposited as individual flakes or formed into films. Electron microscopy strongly suggests that the material is exfoliated into individual layers. By blending this material with suspensions of other nanomaterials or polymer solutions, we can prepare hybrid dispersions or composites, which can be cast into films. We show that WS(2) and MoS(2) effectively reinforce polymers, whereas WS(2)/carbon nanotube hybrid films have high conductivity, leading to promising thermoelectric properties.</P>