Recent Advances in Sensing Applications of Two‐Dimensional Transition Metal Dichalcogenide Nanosheets and Their Composites

Abstract

of 18) 1605817As a newly emerging class of nanomaterials, 2D TMD nanosheets possess a unique layered structure and large surface areas, as well as outstanding physical, chemical, optical, and electronic properties, which holds great potential for applications in catalysis, [37] sensing, [38] optics, [39] and energy. [40] In this review, we will focus on the introduction of state of the art sensing applications for 2D TMD nanosheets and their composites. In particular, different sensing strategies together with signal-transducing mechanisms in sensors based on 2D TMD nanosheets and their composites are thoroughly discussed. Our aim is to demonstrate a complete concept in this rapidly emerging research area and to address basic knowledge, opportunities, and challenges in this promising field. We expect that more 2D TMD nanosheets and their composites, as well as more sensing strategies, will be explored in this research field, enabling the fabrication of more accurate sensing devices for practical applications. TMD Nanosheets and Their Composite-Based Electrochemical SensorsThe electrochemical method has been extensively recognized as a powerful tool for fast access to biochemical information in complex samples due to its easy operation, fast response, high sensitivity, and low cost. Inspired by the use of graphene as transducers in electrochemical sensors, [41][42][43] researchers have attempted to use 2D TMD nanosheets as a transducer layer. Their good conductivity, large surface area, fast electron transfer kinetics, high signal/noise ratio, and, more importantly, their feasibility for forming composites, make 2D TMD nanosheets attractive as for electrochemical sensors. [44][45][46][47][48][49][50] Table 1 summarizes the recent progress of electrochemical sensors based on 2D TMD nanosheets and their composites. TMD Nanosheets as a Transducer Layer in Electrochemical SensorsIn 2012, our group developed a single-layer TMD-nanosheetbased electrochemical sensor, in which a single-layer MoS 2nanosheet-modified glassy carbon electrode was directly used for selective detection of dopamine in the presence of uric acid Two-dimensional (2D) transition metal dichalcogenide (TMD) nanosheets, such as MoS 2 , WS 2 , etc., are attracting increasing interest due to their intriguing physical, chemical, electronic, and optical properties. Success in development of methods for large-scale production of 2D TMD nanosheets and their composites has given great potential for various novel applications. In this review, recent progress in sensing applications of 2D TMD nanosheets and their composites is introduced. Moreover, different sensing strategies and signal-transducing mechanisms for sensing devices based on 2D TMD nanosheets and their composites are also summarized and discussed.

Layer‐Dependent Dielectric Function of Wafer‐Scale 2D MoS2

“…In recent years, 2D MoS 2 has ignited intensive interest due to the gradually widespread applications in nanoelectronics, optoelectronics, and spintronics . Various MoS 2 ‐based devices with exotic performances, such as photoelectric detector, field effect transistor, solar cell, sensor, and energy storage devices, have been developed, benefiting from the layer‐dependent bandgap, valley selective circular dichroism, high on/off ratio, and high thermostability of the 2D MoS 2 . The performance of these novel devices significantly depends on the intrinsic optical properties (especially the dielectric function) of the 2D MoS 2 , which exhibit an intriguing layer dependency due to the enhanced quantum confinement effect and the absence of inversion symmetry.…”

Epitaxial Growth of Honeycomb Monolayer CuSe with Dirac Nodal Line Fermions

“…2D materials are important in optoelectronics, catalysts, sensors, energy storage, etc., due to their large specific surface area and novel properties . Among them, transition metal chalcogenides (TMCs) have attracted the most attention, owing to their novel properties (which differ from the bulk properties) and the consequent prospective applications . Unlike 2D transition metal dichalcogenides (TMDs), which are naturally layered in their bulk phase, most transition metal monochalcogenides (TMMs) are not layered, making 2D TMMs difficult to obtain.…”

Wet-Chemical Synthesis and Applications of Semiconductor Nanomaterial-Based Epitaxial Heterostructures

“…Recently, 2D nanomaterials have attracted tremendous attention due to their superior performance and potential applications in electronics and optoelectronics [118][119][120][121][122][123][124][125][126]. Two types of 2D nanosheets/nanoplates have been fabricated in recent years.…”