MRS Meetings and Events


EL07.09.06 2023 MRS Fall Meeting

An Investigation of Lithium and Cobalt Intercalation Method in 2D Transition Metal Dichalcogenides

When and Where

Nov 29, 2023
8:00pm - 10:00pm

Hynes, Level 1, Hall A



Yongha Shin1,Woojong Yu1

Sungkyunkwan University1


Yongha Shin1,Woojong Yu1

Sungkyunkwan University1
In recent studies, it has been confirmed that 2D van der Waals (vdW) materials, including magnetic elements such as CrI<sub>3</sub>, Fe<sub>3</sub>GeTe<sub>2</sub>, Cr<sub>2</sub>Ge<sub>2</sub>Te<sub>6</sub>, VS<sub>2</sub>, and VSe<sub>2</sub>, exhibit long-range ferromagnetic order. In addition, the previous studies have explored improving electrical properties by injecting magnetic dopants into 2D transition metal dichalcogenide (TMD) materials with semiconductor properties or chalcogen defects. However, the intercalation method of inserting a magnetic element between the van der Waals planes of 2D TMDs has rarely been explored.<br/>This study proposes implementing ferromagnetism by inserting Cobalt (Co) between layers of Molybdenum ditelluride (MoTe<sub>2</sub>) using a wet chemical method that sequentially proceeds with Li intercalation and Co intercalation. n-Butyllithium diluted in hexane is widely used as a reagent for Li intercalated complexes because Li has a small atomic radius, high reactivity, and can react at room temperature. 2D TMD materials can exist in a 2H (semiconducting) or 1T' (metallic) phase. MoTe<sub>2</sub> typically exists in a 2H phase under atmospheric conditions and has the lowest equilibrium energy difference between 2H-1T' among TMD materials. Pristine 2H-MoTe<sub>2</sub> undergoes a phase transition to 1T'-MoTe<sub>2</sub> by Li intercalation for 48 hours. This phase transition is confirmed by the 1T' peak observed in the Raman spectrum and the change in gap distance from 6.97 to 6.95 Å measured by X-ray diffraction (XRD) analysis.<br/>Li-intercalated 1T'-MoTe<sub>2</sub> induces ionic exchange during secondary Co intercalation due to its strong reducing ability, effectively allowing zero-valent Co to settle within the vdW gap instead of Li ion. Dicobalt octacarbonyl, Co<sub>2</sub>(CO)<sub>8</sub>, is used as a precursor to provide Co.


van der Waals

Symposium Organizers

Gabriela Borin Barin, Empa
Shengxi Huang, Rice University
Yuxuan Cosmi Lin, TSMC Technology Inc
Lain-Jong Li, The University of Hong Kong

Symposium Support

Montana Instruments

Oxford Instruments WITec
Raith America, Inc.

Session Chairs

Gabriela Borin Barin
Yuxuan Cosmi Lin

In this Session

Large-Area, Pulsed Laser Deposition of MoS2/a-BN Heterostructures for Back-Gate Field Effect Transistors Applications

A Study of Transport and Optical Properties of Liquid Nitrogen-Assisted Deposition of Titanium Oxynitride Thin Films

High-Performance Electromechanical Power Generation of Lithography-Free Large-Scale MoS2 Monolayer Film Harvesters

An Investigation of Lithium and Cobalt Intercalation Method in 2D Transition Metal Dichalcogenides

Effect of Hot-Wire Oxidization and Sulfur Annealing on Layered p-MoS2 for TFT Application

Photoelectrochemical Polymerization (PEP) of EDOT for Formation of Pattered PEDOT at Specific Arbitrary Regions on Hematite (α-Fe2O3)

Spatially Resolved and In Situ Electrochemical Imaging on Two-Dimensional Materials using Scanning ElectroChemical Cell Microscopy (SECCM)

Nanowire-Based Sensor Platform for Breath Analysis

Sensitive Microwave Spectroscopy of Van der Waals Materials with Coplanar Waveguides

Ultratrace PFAS Detection using Amplifying Fluorescent Polymers

View More »

Publishing Alliance

MRS publishes with Springer Nature