Controlled, Defect-Guided, Metal-Nanoparticle Incorporation onto MoS₂ via Chemical and Microwave Routes: Electrical, Thermal, and Structural Properties

Abstract

Ultrathin (0.3-3 nm) metal dichalcogenides exhibit confinement of carriers, evolution of band-structure and photophysical properties with thickness, high on/off rectification (in MoS2, WS2, and so forth) and high thermal absorption. Here, we leverage the stable sulfur/nobel-metal binding to incorporate highly capacitive gold nanoparticles (Au NPs) onto MoS2 to raise the effective gate-voltage by an order of magnitude. Functionalization is achieved via both diffusion limited aggregation and instantaneous reaction arresting (using microwaves) with selective deposition on crystallographic edges (with 60° displacement). The electrical, thermal, and Raman studies show a highly capacitive interaction between Au NP and MoS2 flakes (CAu-MoS2 = 2.17 μF/cm(2)), a low Schottky barrier (14.52 meV), a reduced carrier-transport thermal-barrier (253 to 44.18 meV after Au NP functionalization), and increased thermal conductivity (from 15 to 23 W/mK post NP deposition). The process could be employed to attach electrodes to heterostructures of graphene and MoS2, where a gold film could be grown to act as an electron-tunneling gate-electrode connected to MoS2.

Two-Dimensional Colloidal Nanocrystals

“…258 The reduction of the metal salt can be induced using chemical, microwave or thermal routes for example. 259 The noble metal decoration of TMDCs nanosheets has been demonstrated down to the monolayer.…”

Black phosphorus: a two-dimensional reductant for in situ nanofabrication

“…[6][7][8] Furthermore, the chemical reactivity of 2D materials such as graphene oxide (GO) and TMDs has raised concerns and novel templates have been proposed to fabricate functional composites. [9][10][11][12][13][14][15][16][17] Black phosphorus (BP) has emerged to be an exciting member of the 2D family. 18,19 BP has strong in-plane bonds in conjunction with weak van der Waals interlayer interactions thereby enabling exfoliation into few-layer BP sheets or phosphorene (single-layer BP).…”

Single‐Layer Transition Metal Dichalcogenide Nanosheet‐Assisted Assembly of Aggregation‐Induced Emission Molecules to Form Organic Nanosheets with Enhanced Fluorescence

“…[1][2][3][4][5][6][7][8][9] Many efforts have been devoted to develop facile and feasible methods for the large-scale production of these nanosheets. [10][11][12][13][14][15] Recently, the high-yield preparation of single-layer TMD nanosheets such as MoS 2 , TiS 2 and TaS 2 has been realized in our group by an electrochemical Li-intercalation method, which is signifi cant for their further applications.…”