The two-step electrosynthesis of nanocomposites of Ag, Au, and Pd nanoparticles with iron(<scp>ii</scp>) oxide-hydroxide

Fazleeva, Rezeda R.; Nasretdinova, Gulnaz R.; Gubaidullin, А. Т.; Evtyugin, V. G.; Yanilkin, V. V.

doi:10.1039/d1nj05844d

Cited by 10 publications

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“…The presence of stabilizers, PVP and CTAC, also did not lead to any significant change in the catalytic activity of the systems. The ability of CTAC to enhance the catalytic properties of metal nanoparticles through micellar catalysis [39][40][41][42][43] was not manifested to a significant extent in this case.…”

Section: Resultsmentioning

confidence: 66%

“…The catalytic activity of nanoparticles in nitroaromatic reduction reactions decreases in the Pd-Au-Ag series using both mediators, as in the literature 44 and in our previous studies. 40,45 It should be noted, that in the case of Au and Pd, the use of CBPQT 4+ as a mediator leads to a decrease in particle size by an average of 2.0 and 1.2 times, respectively. In the case of silver, however, the particle size increases by almost 2.2 times.…”

Section: Resultsmentioning

confidence: 99%

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Mediated Electrosynthesis of Nanocomposites of Gold Nanoparticles with Cyclobis (paraquat-p-phenylene)

Nasretdinova,

Fazleeva,

Yanilkin

et al. 2024

ECS J. Solid State Sci. Technol.

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The result of cyclobis(paraquat-p-phenylene) (CBPQT4+) –mediated reduction of gold ions generated by anodic oxidation of metallic gold in MeCN (50% vol.) – H2O/0.05 M Bu4NCl medium in the absence and presence of such stabilizers as cetyltrimethylammonium chloride and polyvinylpyrrolidone is polydisperse aggregated composite nanoparticles with sizes ranging from several nm to 100 nm or more. The resulting AuNP@(CBPQT4+)n nanocomposite is a gold nanoparticle encapsulated in a shell of macrocycle molecules. CBPQT4+ is bound to the surface of the gold nanoparticle by donor-acceptor interactions between the electron-withdrawing viologen units and the electron-donating metal particle. Theoretical calculations suggest that the cavity of the bound macrocycle is not empty, but filled with 10-12 gold atoms. CBPQT4+ presumably forms a monomolecular layer on the metal surface, and its excess amount is involved in the aggregation and sedimentation of the nanocomposites. The encapsulation of AuNPs in the macrocyclic shell is the main reason for the suppression of the metal catalytic activity in the test reaction of p-nitrophenol reduction with sodium borohydride.

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