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Synthesis of molybdenum nitrides nanosheets by nitriding 2H‐MoS 2 with ammonia
Author(s) -
Sun GuoDong,
Zhang GuoHua,
Chou KuoChih
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15467
Subject(s) - nitriding , molybdenum , nitride , ammonia , materials science , molybdenum disulfide , metal , chemical engineering , nitrogen , inorganic chemistry , nanotechnology , metallurgy , chemistry , layer (electronics) , organic chemistry , engineering
Abstract Metal nitrides nanosheets possess remarkable physical and chemical properties such as high electrical conductivities, catalytic properties, energy storage, and conversion efficiency. In this paper, molybdenum nitride (Mo 5 N 6 , MoN, and Mo 2 N) nanosheets were synthesized by nitriding and exfoliating the bulk 2H‐MoS 2 via dropping N from ammonia at high temperature. Molybdenum nitride nanosheets with the thickness of dozens of nanometers were prepared successfully under different conditions. It was found that the reaction between MoS 2 and NH 3 began from about 696°C, and reduction products and reaction mechanisms were strongly dependent on the temperature. When there was MoS 2 , the generated Mo 5 N 6 , MoN, and Mo 2 N can exist stably at even 820, 1020, and 1120°C, respectively. However, they will decompose progressively after MoS 2 was consumed completely: at 820°C, Mo 5 N 6 started to decompose to δ‐MoN; at 1020°C, the phase evolution process of MoN can be described as follows: δ‐MoN→ γ‐Mo 2 N→ β‐Mo 2 N→ Mo, while at 1120°C, the β‐Mo 2 N will transform to Mo.