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Open AccessArticle

Reactivity and Chemical Sintering of Carey Lea Silver Nanoparticles

1
Federal Research Center Krasnoyarsk Scientific Center, Institute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/24, 660036 Krasnoyarsk, Russia
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Department of Chemistry and The Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, TX 77005, USA
3
Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, 660036 Krasnoyarsk, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(11), 1525; https://doi.org/10.3390/nano9111525
Received: 1 October 2019 / Revised: 22 October 2019 / Accepted: 24 October 2019 / Published: 26 October 2019
Carey Lea silver hydrosol is a rare example of very concentrated colloidal solutions produced with citrate as only protective ligands, and prospective for a wide range of applications, whose properties have been insufficiently studied up to now. Herein, the reactivity of the immobilized silver nanoparticles toward oxidation, sulfidation, and sintering upon their interaction with hydrogen peroxide, sulfide ions, and chlorocomplexes of Au(III), Pd(II), and Pt(IV) was investigated using SEM and X-ray photoelectron spectroscopy (XPS). The reactions decreased the number of carboxylic groups of the citrate-derived capping and promoted coalescence of 7 nm Ag NPs into about 40 nm ones, excluding the interaction with hydrogen peroxide. The increased nanoparticles form loose submicrometer aggregates in the case of sulfide treatment, raspberry-like micrometer porous particles in the media containing Pd(II) chloride, and densely sintered particles in the reaction with inert H2PtCl6 complexes, probably via the formation of surface Ag-Pt alloys. The exposure of Ag NPs to HAuCl4 solution produced compact Ag films along with nanocrystals of Au metal and minor Ag and AgCl. The results are promising for chemical ambient temperature sintering and rendering silver-based nanomaterials, for example, for flexible electronics, catalysis, and other applications. View Full-Text
Keywords: silver nanoparticles; Carey Lea colloid; citrate-derived capping; X-ray photoelectron spectroscopy; SEM; oxidation; sulfidation; sintering silver nanoparticles; Carey Lea colloid; citrate-derived capping; X-ray photoelectron spectroscopy; SEM; oxidation; sulfidation; sintering
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Vorobyev, S.; Vishnyakova, E.; Likhatski, M.; Romanchenko, A.; Nemtsev, I.; Mikhlin, Y. Reactivity and Chemical Sintering of Carey Lea Silver Nanoparticles. Nanomaterials 2019, 9, 1525.

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