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Chemical modification in and on single phase [NiO] 0.5 [Al 2 O 3 ] 0.5 nanopowders produces “chocolate chip‐like” Ni x @[NiO] 0.5‐x [Al 2 O 3 ] 0.5 nanocomposite nanopowders
Author(s) -
Wang Fei,
Sun Kai,
Yi Eongyu,
Laine Richard M.
Publication year - 2019
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.16632
Subject(s) - non blocking i/o , materials science , spinel , chemical engineering , nanocomposite , nanoparticle , catalysis , carbon nanotube , phase (matter) , particle size , thermogravimetric analysis , nanoclusters , particle (ecology) , nanotechnology , analytical chemistry (journal) , metallurgy , organic chemistry , chemistry , oceanography , geology , engineering
Abstract Phase‐pure [NiO] 0.5 [Al 2 O 3 ] 0.5 spinel nanoparticles (NPs) with limited aggregation were obtained via liquid‐feed flame spray pyrolysis (LF‐FSP) by combusting metalloorganic precursor solutions. Thereafter “chocolate chip‐like” Ni x [NiO 0.5‐x ][Al 2 O 3 ] 0.5 nanoparticles consisting of primary [NiO 0.5‐x ][Al 2 O 3 ] 0.5 particles with average particle sizes of 40‐60 nm decorated with Ni metal particles (<10 nm in diameter) dispersed on the surface were synthesized by heat treating the spinel NPs at 800°C/7 h in flowing 5% H 2 :N 2 100 mL/min in a fluidized bed reactor. The synthesized materials were characterized using TEM, XRD, FTIR, and TGA/DTA. The Ni depleted areas consist primarily of γ‐Al 2 O 3 . The Ni content (800°C) was determined by TGA to be ≈11.3 wt.% based on TGA oxidation behavior. The successful synthesis of such nanocomposites with limited aggregation on a high temperature support provides a facile route to synthesize well‐defined NP catalysts. This work serves as a baseline study for an accompanying paper, wherein thin, flexible, dense films made from these same NPs are used as regenerable catalysts for carbon nanotube syntheses.