Ultrasonic alloying of preformed gold and silver nanoparticles

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Darya V RadziukHelmuth Möhwald

Abstract

Alloyed gold/silver nanoparticles with a core/shell structure are produced from preformed gold and silver nanoparticles during ultrasonic treatment at different intensities in water and in the presence of surface-active species. Preformed gold nanoparticles with an average diameter of 15 + or - 5 nm are prepared by the citrate reduction of chloroauric acid in water, and silver nanoparticles (38 + or - 7 nm) are formed after reduction of silver nitrate by sodium borohydride. Bare binary gold/silver nanoparticles with a core/shell structure are formed in aqueous solution after 1 h of sonication at high ultrasonic intensity. Cationic-surfactant-coated preformed gold and silver nanoparticles become gold/silver-alloy nanoparticles after 3 h of sonication in water at 55 W cm(-2), whereas only fusion of isolated gold and silver nanoparticles is observed after ultrasonic treatment in the presence of an anionic surfactant. As the X-ray diffraction profile of alloyed gold/silver nanoparticles reveals split, shifted, and disappeared peaks, the face-centered-cubic crystalline structure of the binary nanoparticles is defect-enriched by temperatures that can be as high as several thousand Kelvin inside the cavitation bubbles during ultrasoni...Continue Reading

References

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Feb 24, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Darya RadziukGleb Sukhorukov
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Citations

Sep 15, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Samit GuhaArindam Banerjee
Oct 26, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Darya RadziukDmitry Shchukin
May 14, 2014·Journal of the American Chemical Society·Chuanbo GaoYadong Yin
Jun 25, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Jingsong SunXiaoming Sun
Sep 15, 2014·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·M Meena KumariDaizy Philip
Oct 18, 2012·ACS Applied Materials & Interfaces·Hsien-Tse TungYeukuang Hwu
Sep 11, 2012·Advances in Colloid and Interface Science·James J Kwan, Mark A Borden
Oct 6, 2015·Physical Chemistry Chemical Physics : PCCP·Darya Radziuk, Helmuth Möhwald
Jul 15, 2015·Beilstein Journal of Nanotechnology·Simon RistigMatthias Epple
Nov 5, 2020·Pharmaceutics·Olufunto T Fanoro, Oluwatobi S Oluwafemi
Oct 6, 2018·ACS Applied Materials & Interfaces·Hanju OhSoong Ju Oh

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