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Synthesis of Indium and Indium Oxide Nanoparticles from Indium Cyclopentadienyl Precursor and Their Application for Gas Sensing
Author(s) -
Soulantica K.,
Erades L.,
Sauvan M.,
Senocq F.,
Maisonnat A.,
Chaudret B.
Publication year - 2003
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200304291
Subject(s) - materials science , indium , nanoparticle , high resolution transmission electron microscopy , indium tin oxide , carbon monoxide , chemical engineering , thermal decomposition , oxidizing agent , analytical chemistry (journal) , transmission electron microscopy , inorganic chemistry , nanotechnology , organic chemistry , thin film , chemistry , engineering , metallurgy , catalysis
Decomposition of the organometallic precursor [In(η 5 ‐C 5 H 5 )] in toluene in the presence of methanol (8 vol.‐%) at room temperature leads to the immediate formation of aggregates of indium nanoparticles of 15 ± 2 nm mean diameter. The aggregates are roughly spherical with a mean size of 400 ± 40 nm. The particles were characterized by means of transmission electron and high‐resolution transmission electron microscopies (TEM and HRTEM), and X‐ray diffraction (XRD) studies indicate that the powder consists of the tetragonal phase of indium. The thermal oxidation in air of these nanoparticles yields well‐crystallized nanoparticles of In 2 O 3 with unchanged morphology (aggregates of nanoparticles of 16.6 ± 2 nm mean diameter with aggregate mean size of 400 ± 40 nm) and without any sign of coalescence. XRD pattern shows that the powder consists of the cubic phase of In 2 O 3 . The electrical conductivity measurements demonstrate that this material is highly sensitive to an oxidizing gas such as nitrogen dioxide and barely sensitive to a reducing gas such as carbon monoxide. Its association with SnO 2 ‐based sensors allows the selective detection of carbon monoxide (30 ppm) and sub‐ppm amounts of nitrogen dioxide (400 ppb) in a mixture at 21 °C and at a relative humidity of 60 %.