Solution synthesis of nanocrystalline M-Zn (M = Pd, Au, Cu) intermetallic compounds via chemical conversion of metal nanoparticle precursors

Robert E. Cable, Raymond Edward Schaak

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

Alloys and intermetallic compounds offer a wide range of desirable physical and chemical properties. However, accessing these compounds as nanocrystals is not always straightforward, and the continued development of appropriate synthetic pathways is required. Developing processes that are general toward many systems can be particularly challenging, especially when trying to incorporate highly electropositive metals or metals whose precursors are difficult to reduce into alloy or intermetallic compounds using solution chemistry strategies. Here we report a generalized strategy to access nanocrystalline M-Zn intermetallics (M = Au, Cu, Pd) via the chemical conversion of metal nanoparticles using zerovalent organometallic zinc precursors. Using commercially available reagents, transition-metal nanocrystals are made in hot organoamine solvents, which can be further reacted with diethylzinc or diphenylzinc to form intermetallic AuZn, Au3Zn, Cu5Zn 8, and PdZn. The reaction pathway from the single-metal precursor to the intermetallic product is confirmed, and the overall particle morphology of the metal nanoparticle precursors is generally conserved in the intermetallic nanoparticle products throughout the conversion reaction. This method offers a general and robust route to zinc-based intermetallics with known catalytic, shape-memory, and corrosion-resistant properties.

Original languageEnglish (US)
Pages (from-to)4098-4104
Number of pages7
JournalChemistry of Materials
Volume19
Issue number16
DOIs
StatePublished - Aug 7 2007

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Metal nanoparticles
Intermetallics
Metals
Nanocrystals
Zinc
Organometallics
Shape memory effect
Chemical properties
Transition metals
Physical properties
Corrosion
Nanoparticles

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

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abstract = "Alloys and intermetallic compounds offer a wide range of desirable physical and chemical properties. However, accessing these compounds as nanocrystals is not always straightforward, and the continued development of appropriate synthetic pathways is required. Developing processes that are general toward many systems can be particularly challenging, especially when trying to incorporate highly electropositive metals or metals whose precursors are difficult to reduce into alloy or intermetallic compounds using solution chemistry strategies. Here we report a generalized strategy to access nanocrystalline M-Zn intermetallics (M = Au, Cu, Pd) via the chemical conversion of metal nanoparticles using zerovalent organometallic zinc precursors. Using commercially available reagents, transition-metal nanocrystals are made in hot organoamine solvents, which can be further reacted with diethylzinc or diphenylzinc to form intermetallic AuZn, Au3Zn, Cu5Zn 8, and PdZn. The reaction pathway from the single-metal precursor to the intermetallic product is confirmed, and the overall particle morphology of the metal nanoparticle precursors is generally conserved in the intermetallic nanoparticle products throughout the conversion reaction. This method offers a general and robust route to zinc-based intermetallics with known catalytic, shape-memory, and corrosion-resistant properties.",
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AB - Alloys and intermetallic compounds offer a wide range of desirable physical and chemical properties. However, accessing these compounds as nanocrystals is not always straightforward, and the continued development of appropriate synthetic pathways is required. Developing processes that are general toward many systems can be particularly challenging, especially when trying to incorporate highly electropositive metals or metals whose precursors are difficult to reduce into alloy or intermetallic compounds using solution chemistry strategies. Here we report a generalized strategy to access nanocrystalline M-Zn intermetallics (M = Au, Cu, Pd) via the chemical conversion of metal nanoparticles using zerovalent organometallic zinc precursors. Using commercially available reagents, transition-metal nanocrystals are made in hot organoamine solvents, which can be further reacted with diethylzinc or diphenylzinc to form intermetallic AuZn, Au3Zn, Cu5Zn 8, and PdZn. The reaction pathway from the single-metal precursor to the intermetallic product is confirmed, and the overall particle morphology of the metal nanoparticle precursors is generally conserved in the intermetallic nanoparticle products throughout the conversion reaction. This method offers a general and robust route to zinc-based intermetallics with known catalytic, shape-memory, and corrosion-resistant properties.

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