Preparation of structured sol–gel films using tape casting method

Kisand, Vambola; Shulga, J.; Tätte, Tanel; Visk, Urmo; Natali, M.; Mistura, Giampaolo; Paalo, Madis; Lobjakas, M.; Kink, Ilmar

doi:10.1016/j.mseb.2006.11.001

Cited by 10 publications

(6 citation statements)

References 8 publications

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“…The procedure was repeated until the last sample was removed from the furnace after a 1‐h annealing at 1150 °C. We have previously also used similar sol–gel methods to prepare pure and doped titania thin films, sol–gel fibres and structured films 14, 17–19.…”

Section: Methodsmentioning

confidence: 99%

Effect of different annealing temperatures and SiO₂/Si(100) substrate on the properties of nickel containing titania thin sol–gel films

Pärna

Joost

Nõmmiste

et al. 2012

Physica Status Solidi (a)

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Nickel containing titania thin films have been prepared on SiO 2 / Si(100) substrate by using the sol-gel deposition and annealing in the air at 450-1150 8C. Several experimental techniques [atomic force microscopy (AFM), X-ray diffraction (XRD), X-ray reflection (XRR), Raman spectroscopy, energy dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), UV-Vis spectroscopy and hydrophilicity measurements] have been applied to characterize these films. Further, the results of this study were compared to previously investigated nickel containing titania on HF-etched Si(100) (i.e. without oxide layer). The morphological and structural properties of nickel containing titania were found to be dependent on the kind of the substrate on which the films were prepared. The thin films deposited on SiO 2 /Si(100) substrate, compared to similar films on HF-etched Si(100) substrate, were more uniform, did not contain large pores and had smaller RMS roughness, especially when annealed below 650 8C. Also films on SiO 2 /Si(100) substrate were more crystalline and anatase transformation to rutile phase occurred at 150 8C lower temperature. Nickel in the films appeared to be in the 2þ oxidation state. When films were annealed above 650 8C, nickel was found mainly in the NiTiO 3 crystallites. Nickel compounds segregated to the surface of the film, forming islands. Nickel addition red-shifted the titania fundamental absorption edge further into the visible range. Films on both substrates demonstrated couple of tens of nanometers thick interlayer formation (between films and substrates) after annealing at 850 and 900 8C. We demonstrated that a well-crystallined anatase was crucial for obtaining a good light-induced hydrophilic nickel containing titania surface.

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Section: Methodsmentioning

confidence: 99%

Effect of different annealing temperatures and SiO₂/Si(100) substrate on the properties of nickel containing titania thin sol–gel films

Pärna

Joost

Nõmmiste

et al. 2012

Physica Status Solidi (a)

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“…A detailed description of the synthesis of the metal-oxo-propoxide ceramic fiber precursors is detailed elsewhere [ 46 ]. Metal alkoxide precursors are highly reactive species, prone to react with water without catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…The decrease in viscosity and relaxation time for the suspensions containing nanoparticles usually occur if the filler particles are smaller than the radius of gyration. However, in our case, the particle size (the CNTs were 10–20 nm in diameter) is far above the required 2 nm [ 46 ]. Such an effect of CNT’s concentration on the rheological parameters could be explained by fluid layers on the surface of dopant particles [ 51 ].…”

Section: Resultsmentioning

confidence: 99%

Rheological Properties of MWCNT-Doped Titanium-Oxo-Alkoxide Gel Materials for Fiber Drawing

et al. 2022

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A strategy of doping by multi-walled carbon nanotubes (MWCNT) to enhance mechanical strength and the electrical conductivity of ceramic fibers has nowadays attracted a great deal of attention for a wide variety of industrial applications. This study focuses on the effect of MWCNTs on rheological properties of metal alkoxide precursors used for the preparation of nanoceramic metal oxide fibers. The rheological behavior of MWCNT-loaded titanium alkoxide sol precursors has been evaluated via an extensional rheometry method. A substantial decrease in elongational viscosity and relaxation time has been observed upon an introduction of MWCNTs even of low concentrations (less than 0.1 wt.%). A high quality MWCNT/nanoceramic TiO2 composite fibers drawn from the specified precursors has been validated. The MWCNT percolation, which is mandatory for electrical conductivity (50 S/m), has been achieved at 1 wt.% MWCNT doping.

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“…The tape-casting/lamination/co-firing (TLC) method offers advantages in terms of scale-up for solid oxide cells, ensuring uniform quality compared to other microfabrication such as dip-coating, spray-coating, and spincoating techniques. [20][21][22][23] Nevertheless, high-temperature cofiring results in the coarsening of nanoparticles on fuel electrode scaffold during the preparation of multi-layer films. To overcome this issue, the design of robust nanostructures is vital to prevent the sintering of metallic nanoparticles in nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Design of Nano‐Composite Structured Electrode for High‐Performance and Stability of Metal‐Supported Solid Oxide Cells

Park,

Kang,

Kim

et al. 2023

Adv Materials Technologies

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Solid oxide cells are reversible energy‐conversion devices for electric power generation and fuel production with high efficiency. However, robust cell structures and multifunctional electrodes must be provided to achieve high cell performance under multifuel conditions. Herein, a precisely controlled metal‐supported structure and dual‐nanocomposite catalyst is presented. The thermal and shrinkage behaviors of the metal supports play a crucial role in determining the interconnectivity between cell components. Compared to micron‐sized cermets, the dual‐nanocomposite electrode with tremendous three‐phase boundaries drastically improves cell performance by increasing the electrochemical activity for diverse fuel reactions. The developed cells exhibited outstanding maximum power densities of 1.1 and 1.0 W cm−2 in fuel‐cell mode using H2 and CO fuels, and current densities of −0.61 and −0.5 A cm−2 in electrolysis‐cell mode (1.3 V) under H2O/H2 and CO2/CO conditions at 650 °C. These findings suggest fundamental techniques for improving the structural stability and activity of cell components to operate in diverse fuel systems.

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Preparation of structured sol–gel films using tape casting method

Cited by 10 publications

References 8 publications

Effect of different annealing temperatures and SiO₂/Si(100) substrate on the properties of nickel containing titania thin sol–gel films

Effect of different annealing temperatures and SiO₂/Si(100) substrate on the properties of nickel containing titania thin sol–gel films

Rheological Properties of MWCNT-Doped Titanium-Oxo-Alkoxide Gel Materials for Fiber Drawing

Design of Nano‐Composite Structured Electrode for High‐Performance and Stability of Metal‐Supported Solid Oxide Cells

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Preparation of structured sol–gel films using tape casting method

Cited by 10 publications

References 8 publications

Effect of different annealing temperatures and SiO2/Si(100) substrate on the properties of nickel containing titania thin sol–gel films

Effect of different annealing temperatures and SiO2/Si(100) substrate on the properties of nickel containing titania thin sol–gel films

Rheological Properties of MWCNT-Doped Titanium-Oxo-Alkoxide Gel Materials for Fiber Drawing

Design of Nano‐Composite Structured Electrode for High‐Performance and Stability of Metal‐Supported Solid Oxide Cells

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Product

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Effect of different annealing temperatures and SiO₂/Si(100) substrate on the properties of nickel containing titania thin sol–gel films

Effect of different annealing temperatures and SiO₂/Si(100) substrate on the properties of nickel containing titania thin sol–gel films