Electrochemical Growth of Diverse Iron Oxide (Fe[sub 3]O[sub 4], α-FeOOH, and γ-FeOOH) Thin Films by Electrodeposition Potential Tuning

Ochoa-Martínez, Luz Araceli; Leinen, D.; Martı́n, Francisco; Gabás, M.; Ramos-Barrado, J.R.; Quagliata, E.; Dalchiele, Enrique A.

doi:10.1149/1.2424416

Cited by 103 publications

(89 citation statements)

References 41 publications

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“…In accordance with published data (Grosvenor et al, 2004;Martinez et al, 2007;Koleva et al, 2009), the peaks found at 711.5 eV and 725 eV match, respectively, the Fe 2p 1/2 and Fe 2p 3/2 band (categorized as the Fe 2+ state of Fe 3 O 4 ). These, together with 717 eV satellite peak, permit to differentiate unmistakably that the sample only contains Fe 3+ states, and therefore our nanoparticles are mainly maghemite (Grosvenor et al, 2004;Koleva et al, 2009;Martinez , 2007). In addition, the sample peak centred at 530 eV exhibited in the O 1s region (Fig.…”

Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 89%

Maghemite Functionalization for Antitumor Drug Vehiculization

2012

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In this paper we describe the preparation and characterization of magnetic nanocomposites designed for applications in targeted drug delivery. Combining superparamagnetic behavior with proper surface functionalization in a single entity makes it possible to have altogether controlled location and drug loading, and release capabilities. The colloidal vehicles consist of maghemite (γ-Fe2O3) cores surrounded by a gold shell through an intermediate silica coating. The external Au layer confers the particles a high degree of biocompatibility and reactive sites for the transported drug binding. In addition, it permits to take advantage of the strong optical resonance, making it easy to visualize the particles or even control their payload release through temperature changes. The results of the analysis of relaxivity demonstrate that these nanostructures can be used as T 2 contrast agents in magnetic resonance imaging (MRI), but the magnetic cores will be mainly useful in manipulating the particles using external magnetic fields. We describe how optical absorbance and electrokinetic data provide a followup of the progress of the nanostructure formation. Additionally, these techniques, together with confocal microscopy, are employed to demonstrate that the component nanoparticles are capable of loading significant amounts of the antitumor drug doxorubicin, very efficient in the chemotherapy of a wide range of tumors. Colon adenocarcinoma cells were used to test the in vitro release capabilities of the drug-loaded nanocomposites.

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Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 89%

Maghemite Functionalization for Antitumor Drug Vehiculization

2012

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“…It indicates that buckypaper pretreated by mixed acid exhibits more nucleating sites for To further study the chemical composition of the octahedral nanoparticles deposited on CNF buckypaper, XPS survey was performed. Figure 5 shows the XPS spectra from a sample deposited at −1.15 V. At the magnified Fe 2p region, the positions of the Fe (2p3/2) and Fe (2p1/2) peaks are centered around 710.88 and 724.48 eV, respectively, corresponding to the standard peak positions of Fe 3− and Fe 2− ion in the stoichiometric Fe 3 O 4 [25,26]. The core-level binding energy of the O1s is peaked at 530.20 eV, indicating the dominant existence of Fe-O bonds in the sample [25].…”

Section: Resultsmentioning

confidence: 99%

Electrodeposition of micro-nano size Fe3O4 crystals anchored on flexible buckypaper

Zhou

Xü

et al. 2015

J Solid State Electrochem

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Magnetite (Fe 3 O 4 ) particles have been electrochemically synthesized on self-supported carbon nanofiber (CNF) buckypaper. The Fe 3 O 4 crystals can be obtained by electrodeposition within a certain potential window with particle size controlled by the deposition time and confirmed by x-ray photoelectron spectroscopy (XPS), x-ray diffraction, and scanning electron microscopy (SEM). The magnetic properties of the Fe 3 O 4 buckypaper composite materials demonstrated a well-defined particle structure had been achieved. Electrochemical synthesis has been proven to be a cost-effective, high throughput, and highly efficient approach in fabricating Fe 3 O 4 /buckypaper composite nanostructures.

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“…Electrodes.-Martinez et al 16 have shown a simple electrodeposition synthesis route of α-and γ-FeOOH with only Mohr's salt and potassium acetate. This method was used as basis for the sample preparation.…”

Section: Methodsmentioning

confidence: 99%

In-Situ Raman Spectroscopy of α- and γ-FeOOH during Cathodic Load

Hedenstedt

Bäckström

Ahlberg

2017

J. Electrochem. Soc.

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Water reduction on corroded iron surfaces is technologically and fundamentally important. Here, the technological interest originates from the chlorate process where water reduction is the main cathodic process. Fundamentally, water reduction on oxide surfaces raises questions on the stability of the oxide and the nature of electrocatalytic surface sites. Two iron oxyhydroxides, αand γ-FeOOH, were electrodeposited on titanium substrate and their reduction processes were followed in detail with in-situ Raman spectroscopy, using low incident laser power to avoid sample damaging. Polarization to negative potentials show two reduction peaks for γ-FeOOH and one peak for α-FeOOH prior to hydrogen evolution. The characteristic Raman peaks gradually disappear as the potential is made more negative but no new peaks can be observed. δ-FeOOH was detected as an intermediate phase upon oxidation of the reduced surface layer. This indicates that Fe(OH) 2 is formed during cathodic polarization and initially re-oxidized to the isostructural δ-FeOOH. Characteristic Raman signals of the original phases appear upon further oxidation in air.

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Electrochemical Growth of Diverse Iron Oxide (Fe[sub 3]O[sub 4], α-FeOOH, and γ-FeOOH) Thin Films by Electrodeposition Potential Tuning

Cited by 103 publications

References 41 publications

Maghemite Functionalization for Antitumor Drug Vehiculization

Maghemite Functionalization for Antitumor Drug Vehiculization

Electrodeposition of micro-nano size Fe3O4 crystals anchored on flexible buckypaper

In-Situ Raman Spectroscopy of α- and γ-FeOOH during Cathodic Load

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