Hydrothermal deposition of small α-Fe2O3 (hematite) particles on ordered zirconium phosphonate multilayer SAMs on gold

Nagtegaal, Marc; Küther, Jörg; Ensling, Jürgen; Gütlich, Philipp; Tremel, Wolfgang

doi:10.1039/a809319i

Cited by 16 publications

(8 citation statements)

References 15 publications

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“…The modification of surfaces of different oxide nanotubes by siloxane, , carboxylic acid, acetyl acetonate, phosphonate, , and catecholate functional groups , offers ways to overcome the insolubility of these inorganic particles in different solvents. This strategy was found to be very useful, in particular, in relation to the photosensitization of the fullerenes and their applications in light conversion and photovoltaic cells.…”

Section: Introductionmentioning

confidence: 99%

Surface Functionalization of WS₂ Fullerene-like Nanoparticles

Shahar¹,

Zbaida²,

Rapoport

et al. 2009

Langmuir

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WS(2) belongs to a family of layered metal dichalcogenide compounds that are known to form cylindrical (inorganic nanotubes-INT) and polyhedral nanostructures--onion or nested fullerene-like (IF) particles. The outermost layers of these IF nanoparticles can be peeled under shear stress, thus IF nanoparticles have been studied for their use as solid lubricants. However, the IF nanoparticles tend to agglomerate, presumably because of surface structural defects induced by elastic strain and curvature, a fact that has a deleterious effect on their tribological properties. In the present work, chemical modification of the IF-WS(2) surface with alkyl-silane molecules is reported. The surface-modified IF nanoparticles display improved dispersion in oil-based suspensions. The alkyl-silane coating reduces the IF-WS(2) nanoparticles' tendency to agglomerate and consequently improves the long-term tribological behavior of oil formulated with the IF additive.

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Section: Introductionmentioning

confidence: 99%

Surface Functionalization of WS₂ Fullerene-like Nanoparticles

Shahar¹,

Zbaida²,

Rapoport

et al. 2009

Langmuir

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“…1 Due to many industrial applications of Fe 2 O 3 nanoparticles, the novel methods for their synthesis have been developed in the past few years. Nanoparticles of the most common polymorphs, γ-Fe 2 O 3 (maghemite) and R-Fe 2 O 3 (hematite), have been synthesized in different forms including nanocomposites with various matrixes, [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] pure nanopowders, [27][28][29][30][31][32][33][34][35] coated particles, or colloidal suspensions. [36][37][38] β-Fe 2 O 3 has so far been developed as a thin film by a chemical vapor deposition method with an organometallic compound as a precursor material and as a powder by a thermally induced solid-state reaction of sodium chloride with ferric sulfate in air.…”

Section: Introductionmentioning

confidence: 99%

Iron(III) Oxide Nanoparticles in the Thermally Induced Oxidative Decomposition of Prussian Blue, Fe₄[Fe(CN)₆]₃

Zbořil

Machala

Mashlan

et al. 2004

Crystal Growth & Design

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The thermally induced decomposition of Prussian Blue, Fe 4 [Fe(CN) 6 ] 3 (PB), was studied in air at 250 and 350 °C. Amorphous Fe 2 O 3 nanoparticles, cubic bixbyite β-and cubic spinel γ-Fe 2 O 3 (maghemite) polymorphs, have been identified as the products of the decomposition under different reaction conditions. 57 Fe Mo ¨ssbauer spectroscopy, XRD, AFM, TEM, quasielastic light scattering method (QELS) of particle size analysis, BET surface area, and magnetization measurements were used to understand the influence of the PB particle size and oxidation conditions on the decomposition mechanism at 250 and 350 °C. At a minimum decomposition temperature of 250 °C, amorphous Fe 2 O 3 nanoparticles were formed with the size ranging from 1 to 4 nm and large surface area of 400-200 m 2 /g in dependence on the PB particle size. Such small amorphous Fe 2 O 3 nanoparticles were obtained by the solid-state route for the first time. At 350 °C, cubic β-Fe 2 O 3 and γ-Fe 2 O 3 polymorphs were identified and their contents were found to be strongly dependent on the initial PB particle size and oxidation-diffusion conditions. Generally, the higher relative content of γ-Fe 2 O 3 was obtained for larger PB particles and in air-limited conditions.

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“…Water soluble colloids have been prepared through the use of thiols that serve as an in situ agent for protection and capping. [10] The crystallization of biominerals such as calcium carbonate [11] and iron hydroxides [12] on gold surfaces modified with different thiols has been extended to the use of protected colloids as crystallization nuclei. [13] Sticky colloids that can be used in the construction of complex composites have been prepared by means of protecting groups.…”

Section: Introductionmentioning

confidence: 99%

Stamping of Monomeric SAMs as a Route to Structured Crystallization Templates: Patterned Titania Films

Bartz¹,

Terfort²,

Knoll³

et al. 2000

Chem. Eur. J.

Self Cite

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Gold-coated glass slides have be patterned by using self-assembled monolayers (SAM) of alkane thiols. Through the use of a special thiol terminated with a styrene monomer, microstructures of 5 to 10 microm width and 70 A height have been formed on the surface by graft polymerization of styrene. These patterned gold slides have then been used to template the precipitation of thin titania films from ethanolic solutions of titanium isopropoxide to create microstructured architectures in the film. Plasmon resonance spectra have established the presence of different steps in the process and have been used to follow the kinetics of the precipitation of titania on the surface. The structured TiO2 films have been characterized by scanning electron microscopy.

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Hydrothermal deposition of small α-Fe2O3 (hematite) particles on ordered zirconium phosphonate multilayer SAMs on gold

Cited by 16 publications

References 15 publications

Surface Functionalization of WS₂ Fullerene-like Nanoparticles

Surface Functionalization of WS₂ Fullerene-like Nanoparticles

Iron(III) Oxide Nanoparticles in the Thermally Induced Oxidative Decomposition of Prussian Blue, Fe₄[Fe(CN)₆]₃

Stamping of Monomeric SAMs as a Route to Structured Crystallization Templates: Patterned Titania Films

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Hydrothermal deposition of small α-Fe2O3 (hematite) particles on ordered zirconium phosphonate multilayer SAMs on gold

Cited by 16 publications

References 15 publications

Surface Functionalization of WS2 Fullerene-like Nanoparticles

Surface Functionalization of WS2 Fullerene-like Nanoparticles

Iron(III) Oxide Nanoparticles in the Thermally Induced Oxidative Decomposition of Prussian Blue, Fe4[Fe(CN)6]3

Stamping of Monomeric SAMs as a Route to Structured Crystallization Templates: Patterned Titania Films

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Resources

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Surface Functionalization of WS₂ Fullerene-like Nanoparticles

Surface Functionalization of WS₂ Fullerene-like Nanoparticles

Iron(III) Oxide Nanoparticles in the Thermally Induced Oxidative Decomposition of Prussian Blue, Fe₄[Fe(CN)₆]₃