Optical properties of Fe-doped silica films on Si

Babonas, G.-J.; Rėza, A.; Šimkienė, I.; Sabataityte, J.; Баран, М.; Szymczak, R.; Karlsson, Ulf O.; Suchodolskis, A.

doi:10.1016/j.apsusc.2005.12.047

Cited by 8 publications

(11 citation statements)

References 12 publications

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“…The magnetic properties of the 1A-and 2A-type samples [16] were also similar. The saturation of magnetization M Fe ∼ 1.5 µ B was achieved for both type samples in a magnetic field of about 3 kOe.…”

Section: Resultsmentioning

confidence: 49%

“…However, a difference in high field behaviour was found: for 2A-type sample, there was practically no change of M Fe ∼ 1.61±0.025 µ B at higher fields, whereas for 1A-type sample the M Fe value gradually grew from 1.34 to 1.46 µ B . The difference was also noticed [16] in the width of hysteresis loops and in temperature dependence of magnetization. These observations could suggest [16] that there was a stronger frustration of magnetic moments in Fe clusters / particles in the 1A-type samples.…”

Section: Resultsmentioning

confidence: 84%

“…The difference was also noticed [16] in the width of hysteresis loops and in temperature dependence of magnetization. These observations could suggest [16] that there was a stronger frustration of magnetic moments in Fe clusters / particles in the 1A-type samples. In the case of 2A-type sample, the dimensions of Fe particles/clusters were widely distributed with a part of these being smaller than those in 1A-type sample, in agreement with structural and optical data.…”

Section: Resultsmentioning

confidence: 84%

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Controlled formation of Fe nanoparticles in silica

Šimkienė¹

2006

Lithuanian J. Phys.

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The SiO2:Fe films on Si substrates were produced by sol-gel and spinning techniques. Hybrid organic-inorganic precursor (tetraethoxysilane-FeCl3) and organic alkoxide precursor modified from Fe acetate were used. The Fe nanoparticles have been formed by various technological procedures. The structural, magnetic and optical characteristics of (SiO2:Fe) / Si samples depending on technology of sample preparation were examined. The size of Fe nanoparticles was shown to be controlled by precursor preparation procedure. It was found that Fe-containing nanocrystals of average size ∼40 nm were formed by "one-pot" technique from the mixture of solutions containing Fe salts and freshly prepared colloidal tetraethoxysilane (TEOS). In contrast, in the "two-pots" procedure, the components of precursor were prepared non-simultaneously and the structurized TEOS sol was used. In the latter case, Fe nanoparticles were distributed in size over a larger range with a mean value at ∼25 nm. It was hence concluded that precursor-controlled formation of Fe nanoparticles can be achieved using different sol-gel technological procedures.

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Section: Resultsmentioning

confidence: 49%

Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 84%

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Controlled formation of Fe nanoparticles in silica

Šimkienė¹

2006

Lithuanian J. Phys.

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“…In the near-infrared region of a relative transparency, the experimental ellipsometric results were analysed in the model of a multilayer structure [25,26]. Each ith layer of the structure was characterized by complex refraction index n i and thickness d i .…”

Section: Experimental Set-upmentioning

confidence: 99%

XPS and optical properties of sol-gel processed vanadium pentoxide films

Bondarenka¹

2008

Lithuanian J. Phys.

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Vanadium pentoxide xerogels were prepared by using sol-gel technology. As-prepared samples of xerogels were heated up to 580 K in order to remove the bonded water. The chemical composition of xerogel samples and thin films has been studied by X-ray photoelectron spectroscopy (XPS). XPS data have shown that pure V2O5 compound was formed. After thermal treatment, in the XPS spectra the main changes occurred in the vicinity of the O 1s peak due to the removal of water from xerogel. The optical properties of V2O5 films were studied by optical transmission and spectroscopic ellipsometry. Ellipsometric measurements have been carried out in the spectral range of 0.5-5.0 eV at 300 K. The changes in the optical spectra were observed after thermal annealing of as-prepared xerogel samples. The obtained data have shown that thermal treatment of V2O5 thin films has strongly influenced the optical transitions involving both localized and higher-lying conduction bands.

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“…Silica layers of controlled porosity were produced on Si wafers by varying the technological procedure [7]. It was found that physical properties of hybrid samples containing Fe/Fe-O particles in silica on Si depended critically on the chemical composition of precursors (FeCl 3 and Fe(CH 3 COO) 3 ) [8], technological procedure ("one-pot" and "two-pots" technique) [9], as well as on the post-growth thermal treatment in various atmospheres (air, Ar, and H 2 ) [7]. The magnetic properties were mostly expressed in the SiO 2 :Fe/SiO 2 /Si samples annealed in hydrogen [8].…”

Section: Introductionmentioning

confidence: 99%

Self-formation of Fe/Fe-O nanoparticles in porous SiO₂films

Šimkienė¹,

Sabataityte²,

Баран³

et al. 2005

Lith. J. Phys.

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Self-formation of Fe/Fe-O particles in porous SiO2 films has been studied by investigating the structure and physical properties of hybrid samples SiO2:Fe/SiO2/Si. The sol-gel spin-on technique was used for the formation of Fe-doped silica films on silica-coated Si wafers. The sol was prepared from precursors composed of ethanol and/or aqueous solutions of tetraethoxysilane (TEOS) and FeCl3. As-grown hybrid samples were annealed in Ar atmosphere. Structural studies by means of atomic force microscopy (AFM) have shown a different morphology of samples produced from precursors with various Fe-amount. Spectroscopic ellipsometry measurements were carried out for characterization of the contribution of Fe/Fe-O clusters to the optical response of hybrid samples. Magnetic properties of Fe-doped silica films were studied by measuring the magnetic field and temperature dependences of magnetization. Experimental data were interpreted taking into account particular features of Fe and Fe-O nanoparticles in silica matrix.

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Optical properties of Fe-doped silica films on Si

Cited by 8 publications

References 12 publications

Controlled formation of Fe nanoparticles in silica

Controlled formation of Fe nanoparticles in silica

XPS and optical properties of sol-gel processed vanadium pentoxide films

Self-formation of Fe/Fe-O nanoparticles in porous SiO₂films

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Optical properties of Fe-doped silica films on Si

Cited by 8 publications

References 12 publications

Controlled formation of Fe nanoparticles in silica

Controlled formation of Fe nanoparticles in silica

XPS and optical properties of sol-gel processed vanadium pentoxide films

Self-formation of Fe/Fe-O nanoparticles in porous SiO2films

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Product

Resources

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Self-formation of Fe/Fe-O nanoparticles in porous SiO₂films