Novel Exfoliation of High-Quality 2H-MoS2 Nanoflakes for Solution-Processed Photodetector

Abstract

Highly dispersive molybdenum disulfide nanoflakes (MoS2 NFs), without any phase transition during the exfoliation process, are desirable for full utilization of their semiconductor properties in practical applications. Here, we demonstrate an innovate approach for fabricating MoS2 NFs by using hydrazine-assisted ball milling via the synergetic effect of chemical intercalation and mechanical exfoliation. The NFs obtained have a lateral size of 600–800 nm, a thickness less than 3 nm, and high crystallinity in the 2H semiconducting phase. They form a stable dispersion in various solvents, which will be helpful for many applications, due to the oxygen functional group. To investigate production of a two-dimensional (2D) photodetector, 2D semiconducting MoS2, MoS2–p-Si vertical devices were fabricated, and their optical properties were characterized. The photodiode exhibited consistent responses with excellent photo-switching characteristics with wavelengths of 850, 530, and 400 nm.

Recent Progress in the Synthesis of MoS2 Thin Films for Sensing, Photovoltaic and Plasmonic Applications: A Review

“…Mechanical exfoliation, also known as micromechanical cleavage, is a straightforward technique that takes advantage of the weak bonding between layers, for the production of high-quality mono-to few-layer MoS 2 [58][59][60]. It consists of exfoliating thin films of 2D-MoS 2 from a bulk MoS 2 crystal by using a low surface tension tape to break the weak interlayer bonds in a similar way as for grapheme [61].…”

“…Chemical exfoliation, on the other hand, appears as a promising approach to produce large quantities of mono-and few-layer MoS 2 nanosheets [60,[63][64][65]. Eda et al [54] reported a high yield of monolayer crystal synthesis using chemical exfoliation of bulk MoS 2 via Li intercalation.…”

Toward layered MoS2 anode for harvesting superior lithium storage

“…51 Additionally, ball milling has the ease of coupling with numerous auxiliary methods to obtain nanostructure-like sheets and akes of the desired dimensions and composition by altering the process conditions. 2,26,50,52,53 Therefore, we proposed ultrasonic-assisted ball milling. The preparation method reduces the size of MoS 2 by ball milling on the one hand, and obtains few-layer MoS 2 by ultrasonic peeling on the other hand.…”

A Novel Carbon-Assisted Chemical Vapor Deposition Growth of Large-Area Uniform Monolayer MoS2 and WS2

“…MoS 2 , a family of TMDCs, has been used as a building block for 2D field-effect transistors due to its high carrier mobility and excellent on-off ratios [ 8 , 9 , 10 ]. In addition, due to its exceptional physicochemical properties, 2D MoS 2 has been extensively used for novel 2D electronics, flexible optoelectronics, and efficient catalysis [ 11 , 12 , 13 , 14 , 15 ]. When MoS 2 is thinned down to a monolayer, its electronic structure and physical symmetries are radically altered, resulting in new physical behavior such as indirect to direct bandgap transitions [ 16 , 17 , 18 ].…”