Effects of Au fraction on the morphology and stability of Au–Ag–Cu trimetallic particles prepared using a polyol method

AuAgCu alloy and phase-separated AuAgCu/Cu nanoparticles were prepared by reducing mixtures of Au(OAc) sub(3), AgNO sub(3), and Cu(OAc) sub(2).H sub(2)O in ethylene glycol (EG) in the presence of poly(vinylpyrrolidone) (PVP) at 175 degree C. At Au(OAc) sub(3) : AgNO sub(3) : Cu(OAc) sub(2).H sub(2)O...

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Bibliographic Details
Published in:CrystEngComm 2013-01, Vol.15 (35), p.7062-7070
Main Authors: Tsuji, Masaharu, Matsunaga, Mika, Yoshida, Yuki, Hattori, Masashi, Ishizaki, Toshitaka
Format: Article
Language:English
Subjects:
Copper
Gold
Heating
Nanoparticles
Silver
Spectra
Stability
Time dependence
Ultraviolet
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Summary:AuAgCu alloy and phase-separated AuAgCu/Cu nanoparticles were prepared by reducing mixtures of Au(OAc) sub(3), AgNO sub(3), and Cu(OAc) sub(2).H sub(2)O in ethylene glycol (EG) in the presence of poly(vinylpyrrolidone) (PVP) at 175 degree C. At Au(OAc) sub(3) : AgNO sub(3) : Cu(OAc) sub(2).H sub(2)O molar ratios of 1 : 1 : 1, short string and peanut types of AuAgCu alloy nanoparticles were formed after 2.5-40 min heating. For Au(OAc) sub(3) : AgNO sub(3) : Cu(OAc) sub(2).H sub(2)O molar ratios of 0.5 : 1 : 1 and 0.1 : 1 : 1, peanut-type or spherical AuAgCu alloy core Cu shell nanoparticles denoted as AuAgCuu were produced after 5 min heating. They changed to a mixture of AuAgCu alloy and phase-separated AuAgCu/Cu nanoparticles after 17.5-37 min heating. The growth mechanisms of AuAgCu, AuAgCuu, and AuAgCu/Cu particles were examined using TEM energy dispersed X-ray spectroscopic (EDS), XRD, and ultraviolet (UV)-visible (Vis)-near infrared (NIR) extinction spectral data. The time dependence of UV-Vis-NIR spectral data indicated that AuAgCu and AuAgCu/Cu nanoparticles retain high stability including anti-oxidation properties for a long time after preparation.
ISSN:1466-8033
1466-8033
DOI:10.1039/c3ce40602d