Electrochemical Synthesis of Fe/Ag and Co/Ag Granular Thin Films

Dacuña, Bruno; Zaragoza, Guillermo; Bianco, Manuel; Quintela, A. López; Mira, J.; Rivas, J.

doi:10.4028/www.scientific.net/msf.269-272.307

Cited by 4 publications

(2 citation statements)

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“…While the terms are often used interchangeably, there is a subtle but important difference between the two. A quasi-RE simply omits the reference solution and immerses the electrode directly into the test solution [ 28 , 29 , 39 , 40 , 41 , 42 , 43 , 44 , 45 ]. A clearly defined redox couple, however, sets the electrode potential, and any fluctuations result from changes in the activity coefficients of this couple.…”

Section: Reference Electrodesmentioning

confidence: 99%

Unconventional Electrochemistry in Micro-/Nanofluidic Systems

2016

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Electrochemistry is ideally suited to serve as a detection mechanism in miniaturized analysis systems. A significant hurdle can, however, be the implementation of reliable micrometer-scale reference electrodes. In this tutorial review, we introduce the principal challenges and discuss the approaches that have been employed to build suitable references. We then discuss several alternative strategies aimed at eliminating the reference electrode altogether, in particular two-electrode electrochemical cells, bipolar electrodes and chronopotentiometry.

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Section: Reference Electrodesmentioning

confidence: 99%

Unconventional Electrochemistry in Micro-/Nanofluidic Systems

2016

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“…The phase diagram of Fe–Ag binary alloys exhibits complete immiscibility even in the liquid phase at ∼1800 K, indicating a strong repulsive interaction between the two metals . This binary system has been synthesized by various methods, such as laser processing, − evaporation, − sputtering, − ion-beam deposition, − mechanical alloying, − electroless deposition, − and electrodeposition. − The latter technique however is especially suitable for tailoring the micro/nanostructure down to few nanometers, mainly due to the low energy and limited mean free path of metal ions in comparison with the physical methods. Electrodeposition of such films indeed results in separated nanophases, with the magnetic precipitates yielding giant magnetoresistance. ,,− Recently, Ag–Fe alloys have also been used as antimicrobial surfaces for biodegradable stents or antibacterial activity. , …”

Section: Introductionmentioning

confidence: 99%

Rational Compositional Control of Electrodeposited Ag–Fe films

Sun

Zangari

2020

Inorg. Chem.

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Some alloys are very difficult to electrodeposit, due to problems such as the large difference in the equilibrium potentials and/or deposition kinetics of the alloy components, as well as the bath instability due to the spontaneous reactions in the bulk electrolyte. The Ag–Fe system is one of those. In this work, a novel alkaline citrate–dimethylhydantoin (DMH) complex has been used to synthesize thermodynamically immiscible Ag–Fe alloy films. The large difference in standard potentials and deposition kinetics of Ag and Fe is partially resolved by complexing Ag(I) with DMH, while the instability caused from spontaneous reduction of Ag(I) by Fe(II) was partially resolved by adding 1% Fe3+, based on the philosophy of the mixed potential theory. Furthermore, a paradigm for control of film composition is developed, based on the mass-transfer coefficient ratio, tested with various bath constitutions. Uniform and high-quality films are obtained, with a composition error of <4 at. % comparing with the predicted values. Electrochemical reactions involved in the deposition baths were systematically investigated using cyclic voltammetry, showing satisfactory agreement with the predicted deposition potentials calculated by equilibrium thermodynamics. The films deposited at high overpotential are proven to be biphasic, containing Ag-fcc and Fe-bcc phases, with a trend of decreasing crystallinity at increasing overpotentials when deposited at constant deposition time. A narrow transition potential range (<0.05 V) from the onset of Fe deposition to its limiting current condition was observed.

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