A biomimetic approach to the deposition of ZrO2 films on self-assembled nanoscale templates

Zhang, Guangneng; Coffey, D. W.; Blom, Douglas A.; Allard, Lawrence F.; Cho, Junghyun

doi:10.1016/j.msec.2005.08.010

Cited by 18 publications

(14 citation statements)

References 27 publications

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“…[24][25][26] Mechanical properties of sulfated zirconia films prepared from similar aqueous depositions on SAM-covered substrates have also been studied. [27][28][29] The interaction of surfaces with gas molecules can be elucidated by adsorptiondesorption (AD) equilibrium measurements. Isotherms or isobars, [30] obtained using flat, conducting surfaces, have been used to deduce coverage-dependent isosteric (constant coverage) heats of adsorption [31] and kinetic data, including the reaction order for desorption and adsorption, the Kisliuk factor and the frequency factor for desorption.…”

Section: Introductionmentioning

confidence: 99%

Adsorption–desorption equilibrium investigations of n-butane on nanocrystalline sulfated zirconia thin films

Lloyd

Hansen

Ranke

et al. 2011

Applied Catalysis A: General

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Nanocrystalline thin films of the alkane skeletal isomerisation catalyst sulfated zirconia were successfully deposited on a silicon substrate in order to allow the application of surface science techniques. Thermal treatment of the films was optimised to chemically mimic the powder preparation process, resulting in films possessing the essential features (including tetragonal phase, nanocrystallinity and sulfur content of ~3 atomic %) of active powder catalysts. The n-butane adsorption-desorption equilibrium under isobaric conditions (10 -8 to 10 -6 hPa) over the temperature range 300-100 K was monitored by photoelectron spectroscopy. Analysis of the isobars revealed strong and weak n-butane chemisorption sites, releasing heats of between 59-40 and 47-34 kJ/mol, corresponding to 5 and 25% of a monolayer coverage, respectively. The total amount of chemisorbed n-butane coincides with the estimated number of surface sulfate groups. An increase in adsorption heat was observed between coverages of ~5-8% of a monolayer, indicating adsorbate-adsorbate interactions. It follows that adjacent sites are present and isomerisation by a bimolecular surface reaction is feasible. Physisorption on the films generates heats of ~28 kJ/mol, for coverages from 30% up to a complete monolayer. Multilayer adsorption results in the formation of an electrically insulating adsorbate structure. It is proposed that the strong chemisorption sites correspond to an interaction with a minority disulfate species.

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Section: Introductionmentioning

confidence: 99%

Adsorption–desorption equilibrium investigations of n-butane on nanocrystalline sulfated zirconia thin films

Lloyd

Hansen

Ranke

et al. 2011

Applied Catalysis A: General

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“…In contrast, under the heterogeneous nucleation mechanism, the oxide particles nucleate and grow on the substrate surface in contact with the solution. Although some indication was given to the heterogeneous nucleation mechanism when the substrate surface was coated with special coatings such as self‐assembled monolayers (SAMs), 31 several reports have provided a strong evidence for the growth of oxide films such as ZrO 2 9,13 and TiO 2 14 via particle attachment than via heterogeneous nucleation on the substrate from precursor solutions.…”

Section: Resultsmentioning

confidence: 99%

“…A variety of techniques for depositing metal oxide thin films from an aqueous solution at a low temperature have been developed and reported in the literature 7–13 . One of these techniques uses in situ precipitation from thermally controlled hydrolysis of inorganic metal salt as a precursor to form the metal oxide thin films.…”

Section: Introductionmentioning

confidence: 99%

“…One of these techniques uses in situ precipitation from thermally controlled hydrolysis of inorganic metal salt as a precursor to form the metal oxide thin films. In particular, thin films of various metal oxides, e.g., ZrO 2 , 9,13 TiO 2 , 8,14 and SnO 2 , 10 have been synthesized on a silicon substrate through this technique. The precursor concentration, pH, and temperature are the most important process parameters in this technique, and all together control the nucleation and growth of the metal oxide nanostructures.…”

Section: Introductionmentioning

confidence: 99%

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Titanium Oxide Nanoparticles Precipitated from Low‐Temperature Aqueous Solutions: II. Thin‐Film Formation and Microstructure Developments

Zhang

Roy

Allard

et al. 2010

Journal of the American Ceramic Society

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We explored effects of the degree of supersaturation, which depends on solution concentration, pH, and temperature, on the development of microstructures of the TiO 2 thin films deposited from the controlled hydrolysis of TiCl 4 aqueous solutions. It was shown that, with precursor (TiCl 4 ) solution of low degree of supersaturation, a porous flower-like dendritic structure was synthesized, while a densely packed particulate nanostructure was obtained with that of high degree of supersaturation. The former morphology was attributed to the directional growth of TiO 2 crystals from the already-deposited films, whereas the latter to the bulk precipitated TiO 2 nanoparticles nucleated in the solution, followed by their attachment and self organization. By establishing the processing-microstructure relations, this study provided a means of generating a wide spectrum of reproducible TiO 2 microstructures using the low-temperature aqueous solution processing.

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“…As a result, they tend to be mechanically weak relative to fired ceramics. For example, Cho and co-workers 56) report a modulus of elasticity of 30 GPa and an indentation hardness of 1 GPa for a CBD ZrO2 film on a phos- …”

Section: Jcs-japanmentioning

confidence: 99%

Recent progress in the synthesis of oxide films from liquid solutions

Parikh

Guire

2009

J. Ceram. Soc. Japan

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This review surveys recent advances in the synthesis of oxide materials, primarily as supported thin films but also in other forms such as free-standing films, mesoporous solids, and nanostructured fibers, from liquid (primarily aqueous) solutions. New studies using chemical bath deposition (CBD), liquid phase deposition (LPD), and successive ion layer adsorption and reaction (SILAR) to produce single-and multi-component oxide films, and the role that functionalized substrates can play in these deposition techniques, are surveyed. This review highlights significant new insights that have been gained in areas such as: nucleation and growth kinetics as they pertain to film growth in oxide systems; multicomponent films; the roles of polymers and other organic additives on the film deposition mechanism; and fabrication of patterned films and other advanced material morphologies.

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A biomimetic approach to the deposition of ZrO2 films on self-assembled nanoscale templates

Cited by 18 publications

References 27 publications

Adsorption–desorption equilibrium investigations of n-butane on nanocrystalline sulfated zirconia thin films

Adsorption–desorption equilibrium investigations of n-butane on nanocrystalline sulfated zirconia thin films

Titanium Oxide Nanoparticles Precipitated from Low‐Temperature Aqueous Solutions: II. Thin‐Film Formation and Microstructure Developments

Recent progress in the synthesis of oxide films from liquid solutions

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