Fabrication of Cu-Ag core-shell bimetallic superfine powders by eco-friendly reagents and structures characterization

Journal Article · Thu Sep 15 04:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.06.032· OSTI ID:21580258

Jun, Zhao ^[1]; Jie, Zhao ^[1]

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1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Yi Fu Building 4th Floor, Wuhan 430070 (China)

Superfine bimetallic Cu-Ag core-shell powders were synthesized by reduction of copper sulfate pentahydrate and silver nitrate with eco-friendly ascorbic acid as a reducing agent and cyclodextrins as a protective agent in an aqueous system. The influence of Ag/Cu ratio on coatings was investigated. Ag was homogeneously distributed on the surface of Cu particles at a mole ratio of Ag/Cu=1. FE-SEM showed an uniformity of Ag coatings on Cu particles. Antioxidation of Cu particles was improved by increasing Ag/Cu ratio. TEM-EDX and UV-vis spectra also revealed that Cu cores were covered by Ag nanoshells on the whole. The surface composition analysis by XPS indicated that only small parts of Cu atoms in the surface were oxidized. It was noted that the hindrance of cyclodextrins chemisorbed on particles plays an important role in forming high quality and good dispersity Cu-Ag (Cu-Ag) core-shell powders. - Graphical abstract: Mechanism of fabricating Cu-Ag particles with good dispersibility using {beta}-CDs as a protective agent was studied because of its special structure. Highlights: > Green supramolecular {beta}-CD used as a protective agent and ascorbic acid(Vc) as a reducing agent to fabricate Cu-Ag powders. > Particles are monodisperse and the diameter is close to nanoscale(100-150 nm). > Resistance of Cu particles to oxidation was higher. > Formation mechanism explained.

• OSTI ID: 21580258
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 9 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ASCORBIC ACID
CARBOHYDRATES
CHEMICAL REACTIONS
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
MICROSCOPY
NANOSTRUCTURES
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
OXIDATION
PARTICLES
PHOTOELECTRON SPECTROSCOPY
POWDERS
REAGENTS
REDUCING AGENTS
SACCHARIDES
SCANNING ELECTRON MICROSCOPY
SPECTRA
SPECTROSCOPY
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA
VITAMINS
X-RAY PHOTOELECTRON SPECTROSCOPY