Tailored Langmuir–Schaefer Deposition of Few-Layer MoS₂ Nanosheet Films for Electronic Applications

Abstract

Few-layer MoS2 films stay at the forefront of current research of two-dimensional materials. At present, continuous MoS2 films are prepared by chemical vapor deposition (CVD) techniques. Herein, we present a cost-effective fabrication of the large-area spatially uniform films of few-layer MoS2 flakes using a modified Langmuir–Schaefer technique. The compression of the liquid-phase exfoliated MoS2 flakes on the water subphase was used to form a continuous layer, which was subsequently transferred onto a submerged substrate by removing the subphase. After vacuum annealing, the electrical sheet resistance dropped to a level of 10 kΩ/sq, being highly competitive with that of CVD-deposited MoS2 nanosheet films. In addition, a consistent fabrication protocol of the large-area conductive MoS2 films was established. The morphology and electrical properties predetermine these films to advanced detecting, sensing, and catalytic applications. A large number of experimental techniques were used to characterize the exfoliated few-layer MoS2 flakes and to elucidate the formation of the few-layer MoS2 Langmuir film.

High‐performance symmetric supercapacitor based on molybdenum disulfide/poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) composite electrodes deposited by spray‐coating

“…The MoS 2 exhibited a sheet resistance of 79 kΩ sq −1 . This value is comparable to those found in the literature for MoS 2 nanosheet films deposited by more sophisticated techniques, such as chemical vapor deposition and Langmuir‐Schaefer 48 . The sheet resistance found for the PEDOT:PSS film is also similar to those reported in the literature 49 .…”

Recent Advances in Quantum Dots for Photocatalytic CO2 Reduction: A Mini-Review

“…By the controlled synthesis of the TMCs from bulk to 2D nanosheets or 0D QDs, the bandgaps in TMCs can be tuned with respect to size and shape ( Yao et al, 2019 ; Pandey et al, 2020 ). There are more than 40 kinds of TMCs available till date, which can be synthesized in large quantities by using synthesis techniques such as the CVD method ( Bosi, 2015 ; Severs Millard et al, 2020 ), hydrothermal method ( Chen and Fan, 2001 ), and Langmuir–Schaefer deposition method ( Kalosi et al, 2019 ).…”

Transition Metal Dichalcogenides for the Application of Pollution Reduction: A Review

“…The main metals (W and Mo) in TMDCs are both abundant, cheap, and widely used in industry [ 34 ]. TMDCs can be prepared by using various techniques, such as chemical vapor deposition (CVD) [ 35 , 36 ], chemical vapor transport (CVT) [ 37 , 38 ], flux growth method [ 39 ], hydrothermal synthesis [ 40 ], Langmuir−Schaefer deposition [ 41 ], etc. In addition, the top-down exfoliated method can be also used to fabricate few-layer TMDCs from bulk crystals, e.g., mechanical exfoliations and liquid phase exfoliations [ 42 , 43 , 44 ].…”