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Synthesis of β‐MoO 3 nanowhiskers from core/shell molybdenum/molybdenum oxide wire by pulsed wire discharge
Author(s) -
Chu Ngo Minh,
Duy Hieu Nguyen,
Do Thi Mai Dung,
Nakayama Tadachika,
Niihara Koichi,
Suematsu Hisayuki
Publication year - 2021
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13684
Subject(s) - materials science , molybdenum , whiskers , transmission electron microscopy , nanowire , nucleation , chemical engineering , oxide , molybdenum trioxide , molybdenum disulfide , nanotechnology , composite material , metallurgy , chemistry , organic chemistry , engineering
Abstract β‐MoO 3, the molybdenum oxide phase with the highest catalytic activity, is a promising material in optical, chemical, and electronics applications as a replacement for α‐MoO 3 . α‐MoO 3 1D nanostructures such as whiskers and fibers have been investigated and used in applications. However, difficulties in the synthesis of one‐dimensional β‐MoO 3 have obstructed researchers in the study of its properties. In this research, β‐MoO 3 nanowhiskers were synthesized from core/shell molybdenum/molybdenum oxide wires by pulsed wire discharge in mixed oxygen and argon gases. X‐ray diffraction analysis identified the main phase in the obtained samples as β‐MoO 3 . Electron microscopy observations revealed whiskers with an average length and width of 216 nm and 23 nm, respectively. Transmission electron microscopy lattice imaging confirmed the successful synthesis of β‐MoO 3 nanowhiskers. Various models were considered to explain the formation of β‐MoO 3 nanowhiskers, including mechanical fragmentation of α‐MoO 3 layers as well as vapor‐liquid‐solid and vapor‐solid mechanisms. The phase transformation from α to β‐MoO 3 under a nucleation process was explained based on the Mo‐O phase diagram. To the best of our knowledge, this is the first report of β‐MoO 3 nanowhisker synthesis.