Title: Phase-Controllable Synthesis of Ultrathin Molybdenum Nitride Crystals Via Atomic Substitution of MoS2

Journal Article · · Chemistry of Materials

MXenes are emerging members in the two-dimensional (2D) material family and are highlighted by their high electrical conductivity. Among different MXenes, molybdenum-based MXenes, especially molybdenum nitrides (MoNx), are rarely accessible through the common synthetic approach of selective etching due to the absence of stable MAX phase precursors. In this work, we apply the atomic substitution approach to synthesize two phases of ultrathin nonlayered molybdenum nitrides (i.e., Mo5N6 and δ-MoN) from 1.6 to 42.9 nm thickness by converting layered MoS2 under different temperatures. The morphology and 2D nature of MoS2 are well remained in both phases. These newly created 2D materials are further characterized using Raman spectroscopy, high-resolution transmission electron microscopy, and electrical measurements, suggesting that both phases are highly crystalline and highly conductive down to the thickness of a few nanometers. Moreover, Ohmic contacts are formed between the ultrathin nitrides and Cr/Au electrodes, suggesting the great potential of the obtained nitrides for nanoelectronic device applications. The stability test shows that the Ohmic contact is well maintained after 4 weeks under ambient conditions with a slight degradation in conductivity. Furthermore, this study extends the 2D family by providing highly conductive members, offering desired building blocks for solid-state nanoelectronic devices.

Research Organization:
Boston Univ., MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0018675; SC0021064
OSTI ID:
1865049
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 1 Vol. 34; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (44)

Highly Conductive Optical Quality Solution-Processed Films of 2D Titanium Carbide journal April 2016
Two-Dimensional Nanocrystals Produced by Exfoliation of Ti3AlC2 journal August 2011
25th Anniversary Article: MXenes: A New Family of Two-Dimensional Materials journal December 2013
Direct Synthesis of Large-Area 2D Mo 2 C on In Situ Grown Graphene journal July 2017
Vanadium Diselenide Single Crystals: Van der Waals Epitaxial Growth of 2D Metallic Vanadium Diselenide Single Crystals and their Extra‐High Electrical Conductivity (Adv. Mater. 37/2017) journal July 2017
Electronic and Optical Properties of 2D Transition Metal Carbides and Nitrides (MXenes) journal November 2018
Probing the Domain Architecture in 2D α-Mo 2 C via Polarized Raman Spectroscopy journal January 2019
Fabrication of Ti 3 C 2 T x MXene Transparent Thin Films with Tunable Optoelectronic Properties journal April 2016
Metallic two-dimensional metal-organic framework arrays for ultrafast water splitting journal May 2021
Crystal structure and high-pressure properties of γ-Mo2N determined by neutron powder diffraction and X-ray diffraction journal June 2006
Synthesis and characterisation of hexagonal molybdenum nitrides journal August 2006
Metallic 1T phase MoS2 nanosheets for high-performance thermoelectric energy harvesting journal August 2016
Original Synthesis of Molybdenum Nitrides Using Metal Cluster Compounds as Precursors: Applications in Heterogeneous Catalysis journal May 2020
Guidelines for Synthesis and Processing of Two-Dimensional Titanium Carbide (Ti 3 C 2 T x MXene) journal September 2017
Salt-Templated Synthesis of 2D Metallic MoN and Other Nitrides journal February 2017
Metallic Ti 3 C 2 T x MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio journal January 2018
Environment-Sensitive Photoresponse of Spontaneously Partially Oxidized Ti 3 C 2 MXene Thin Films journal May 2018
Single-Crystal Nitrogen-Rich Two-Dimensional Mo 5 N 6 Nanosheets for Efficient and Stable Seawater Splitting journal November 2018
Prediction of Synthesis of 2D Metal Carbides and Nitrides (MXenes) and Their Precursors with Positive and Unlabeled Machine Learning journal March 2019
Transparent Conductive Two-Dimensional Titanium Carbide Epitaxial Thin Films journal March 2014
A New Molybdenum Nitride Catalyst with Rhombohedral MoS 2 Structure for Hydrogenation Applications journal April 2015
Emerging Photoluminescence in Monolayer MoS2 journal April 2010
Anomalous Lattice Vibrations of Single- and Few-Layer MoS 2 journal March 2010
Two-Dimensional Transition Metal Carbides journal January 2012
Intercalation and delamination of layered carbides and carbonitrides journal April 2013
Phase-engineered low-resistance contacts for ultrathin MoS2 transistors journal August 2014
Large-area high-quality 2D ultrathin Mo2C superconducting crystals journal August 2015
Roll-to-roll production of 30-inch graphene films for transparent electrodes journal June 2010
Metallic 1T phase MoS2 nanosheets as supercapacitor electrode materials journal March 2015
Control of MXenes’ electronic properties through termination and intercalation journal January 2019
Low temperature synthesis of plasmonic molybdenum nitride nanosheets for surface enhanced Raman scattering journal August 2020
Phase Stability and Compressibility of 3R-MoN2 at High Pressure journal July 2019
Oxidation stability of Ti3C2Tx MXene nanosheets in solvents and composite films journal February 2019
All-MXene (2D titanium carbide) solid-state microsupercapacitors for on-chip energy storage journal January 2016
Solution-processed titanium carbide MXene films examined as highly transparent conductors journal January 2016
2D molybdenum and vanadium nitrides synthesized by ammoniation of 2D transition metal carbides (MXenes) journal January 2017
A cleanroom in a glovebox journal July 2020
Transparent, conductive solution processed spincast 2D Ti 2 CT x (MXene) films journal March 2017
Two-dimensional metallic NbS 2 : growth, optical identification and transport properties journal May 2016
Synthesis of molybdenum nitrides nanosheets by nitriding 2H-MoS 2 with ammonia journal February 2018
Realization of 2D crystalline metal nitrides via selective atomic substitution journal January 2020
Chemical vapor deposition of layered two-dimensional MoSi 2 N 4 materials journal August 2020
Molybdenum Nitride Films: Crystal Structures, Synthesis, Mechanical, Electrical and Some Other Properties journal October 2015
The Stability of Metallic MoS2 Nanosheets and Their Property Change by Annealing journal September 2019