TY - JOUR
T1 - Oxidative transformation of intermetallic nanoparticles
T2 - An alternative pathway to metal/oxide nanocomposites, textured ceramics, and nanocrystalline multimetal
AU - Dawood, Farah
AU - Leonard, Brian M.
AU - Schaak, Raymond Edward
PY - 2007/9/4
Y1 - 2007/9/4
N2 - A new low-temperature strategy is described for the synthesis of nanocrystalline multimetal oxides. In this approach, intermetallic nanoparticles synthesized via a modified polyol process are used as reactive precursors that help to define both the composition and morphology of multimetal oxides via a two-step thermal oxidation process. We use Bi2PdO4 and Bi2Pt2O7 as model systems for elaborating this new synthetic strategy. For Bi2PdO4, intermetallic Bi 2Pd nanocubes are thermally oxidized to form a Bi2O 3/Pd nanocomposite, which transforms to textured Bi 2PdO4 upon further heating in O2. Bi 2Pt2O7 is formed using a similar strategy involving the thermal oxidation of intermetallic Bi - Pt nanoparticles. The reaction pathway is established using a combination of X-ray diffraction analysis, transmission electron microscopy, thermogravimetric analysis, and energy-dispersive spectrometry element mapping data. Given the growing number of intermetallic compounds that are accessible as nanoparticles, this strategy has the potential to yield many other mixed metal oxides as nanocrystalline powders. Supported nanoparticle catalyst systems and textured ceramics are also accessible by exploiting the reaction pathway.
AB - A new low-temperature strategy is described for the synthesis of nanocrystalline multimetal oxides. In this approach, intermetallic nanoparticles synthesized via a modified polyol process are used as reactive precursors that help to define both the composition and morphology of multimetal oxides via a two-step thermal oxidation process. We use Bi2PdO4 and Bi2Pt2O7 as model systems for elaborating this new synthetic strategy. For Bi2PdO4, intermetallic Bi 2Pd nanocubes are thermally oxidized to form a Bi2O 3/Pd nanocomposite, which transforms to textured Bi 2PdO4 upon further heating in O2. Bi 2Pt2O7 is formed using a similar strategy involving the thermal oxidation of intermetallic Bi - Pt nanoparticles. The reaction pathway is established using a combination of X-ray diffraction analysis, transmission electron microscopy, thermogravimetric analysis, and energy-dispersive spectrometry element mapping data. Given the growing number of intermetallic compounds that are accessible as nanoparticles, this strategy has the potential to yield many other mixed metal oxides as nanocrystalline powders. Supported nanoparticle catalyst systems and textured ceramics are also accessible by exploiting the reaction pathway.
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U2 - 10.1021/cm071147t
DO - 10.1021/cm071147t
M3 - Article
AN - SCOPUS:34548863131
VL - 19
SP - 4545
EP - 4550
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 18
ER -