• Home
  • Search Results
  • Green electrochemical template synthesis of CoPt nanoparticles with tunable size, composition, and magnetism from microemulsions using an ionic liquid (bmimPF6).

Green electrochemical template synthesis of CoPt nanoparticles with tunable size, composition, and magnetism from microemulsions using an ionic liquid (bmimPF6).

ACS nano (2014-05-03)
Albert Serrà, Elvira Gómez, José Francisco López-Barbera, Josep Nogués, Elisa Vallés
ABSTRACT

Electrodeposition from microemulsions using ionic liquids is revealed as a green method for synthesizing magnetic alloyed nanoparticles, avoiding the use of aggressive reducing agents. Microemulsions containing droplets of aqueous solution (electrolytic solution containing Pt(IV) and Co(II) ions) in an ionic liquid (bmimPF6) define nanoreactors in which the electrochemical reduction takes place. Highly crystalline hcp alloyed CoPt nanoparticles, in the 10-120 nm range with a rather narrow size distribution, have been deposited on a conductive substrate. The relative amount of aqueous solution to ionic liquid determines the size of the nanoreactors, which serve as nanotemplates for the growth of the nanoparticles and hence determine their size and distribution. Further, the stoichiometry (Pt(x)Co(1-x)) of the particles can be tuned by the composition of the electrolytic solution inside the droplets. The control of the size and composition of the particles allows tailoring the room-temperature magnetic behavior of the nanoparticles from superparaparamagnetic to hard magnetic (with a coercivity of HC = 4100 Oe) in the as-obtained state.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Boric acid, ACS reagent, ≥99.5%
Sigma-Aldrich
Boric acid, BioReagent, for molecular biology, suitable for cell culture, suitable for plant cell culture, ≥99.5%
Sigma-Aldrich
Ammonium chloride, for molecular biology, suitable for cell culture, ≥99.5%
Sigma-Aldrich
Ammonium chloride, 99.998% trace metals basis
Sigma-Aldrich
Ammonium chloride, ReagentPlus®, ≥99.5%
Sigma-Aldrich
Boric acid, ReagentPlus®, ≥99.5%
Sigma-Aldrich
Diphenyl ether, ReagentPlus®, ≥99%
Sigma-Aldrich
Boric acid, suitable for electrophoresis, ≥99.5%
Sigma-Aldrich
Boric acid, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., buffer substance, ≥99.8%
Sigma-Aldrich
Boric acid, 99.999% trace metals basis
Sigma-Aldrich
Diphenyl ether, ReagentPlus®, 99%
Supelco
Ammonium chloride, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
Diphenyl ether, ≥99%, FG
Sigma-Aldrich
Ammonium chloride, BioUltra, for molecular biology, ≥99.5% (AT)
Sigma-Aldrich
Ammonium chloride, 99.99% trace metals basis
Sigma-Aldrich
Sodium hexachloroplatinate(IV) hexahydrate, 98%
Sigma-Aldrich
Ammonium chloride, puriss., meets analytical specification of Ph. Eur., BP, USP, FCC, 99.5-100.5% (calc. to the dried substance)
Sigma-Aldrich
Boric acid, BioXtra, ≥99.5%
Supelco
Ammonium ion solution for ISE, 1000 mg/kg N, analytical standard (for ion-selective electrodes)
Sigma-Aldrich
Boric acid, 99.97% trace metals basis
Sigma-Aldrich
Boric acid, tablet, 1 g boric acid per tablet
Sigma-Aldrich
Boric acid, puriss., meets analytical specification of Ph. Eur., BP, NF, 99.5-100.5%, powder
Sigma-Aldrich
Boric acid, BioUltra, for molecular biology, ≥99.5% (T)
Sigma-Aldrich
Boric acid-11B, ≥99 atom % 11B
Supelco
Diphenyl ether, Selectophore, ≥99.9%
Supelco
Benalaxyl-M, PESTANAL®, analytical standard
Sigma-Aldrich
Ammonium chloride, tested according to Ph. Eur.
Sigma-Aldrich
Ammonium-14N chloride, 99.99 atom % 14N, 15N-depleted, 99% (CP)