Characteristics of sol–gel deposited alumina films

Murali, K. R.; Thirumoorthy, P.

doi:10.1016/j.jallcom.2010.03.219

Cited by 22 publications

(6 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Polymorphic crystalline aluminium oxides with the chemical formula Al 2 O 3 , and commonly referred with the generic name of alumina, are extensively used in numerous industrial applications (ceramics, abrasive materials, absorbents, catalysts, biomaterials, composites, pigments, etc) [1][2][3][4]. Among the various structural forms, only the alpha alumina (α-Al 2 O 3 ), or corundum is the thermodynamically stable.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of α-alumina from a less common raw material

López‐Delgado

Fillali

Jiménez

et al. 2012

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

A nanostructured α-Al 2 O 3 with particle size lower than 100 nm was obtained from a hazardous waste generated in slag milling process by the aluminium industry. The route developed to synthesize alumina consisted of two steps: in the first one, a precursor of alumina, boehmite, γ-AlOOH was obtained by a sol-gel method. In the second step, the alumina was obtained by calcination of the precursor boehmite (xerogel). Calcination in air was performed at two different temperatures, i.e 1300 and 1400 ºC, to determine the influence of this parameter on the quality of resulting alumina. X-ray diffraction patterns and transmission electron microscopy images of calcined powers revealed beside corundum the presence of transition aluminas and some rest of amorphous phase in the sample prepared at 1300 ºC. The increase of the calcinations temperature to 1400 ºC favors the formation of an almost single-phase corundum powder. The transition of θ-to α-Al 2 O 3 was followed by means of Infrared spectroscopy, since it is accompanied by the disappearance of the he IR band frequencies associated with tetrahedral sites (AlO 4 sites), giving rise to a spectrum dominated by Al 3+ ions in octahedral sites (AlO 6) characteristic of corundum.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis of α-alumina from a less common raw material

López‐Delgado

Fillali

Jiménez

et al. 2012

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

show abstract

“…The spectra of pure Al 2 O 3 and silver incorporated Al 2 O 3 films differ considerable in their shape, which is due to the influence of Ag nanoparticles into the metal oxide matrix. The broad bands at the spectral range 520-600 cm -1 (better expressed for pure Al 2 O 3 ) can be attributed to the vibrations of AlO4 [16]. The IR peaks attributed to C=C and C-H stretching vibrations are located at 1535.9 and at 1389.8 cm -1 .…”

Section: Resultsmentioning

confidence: 95%

Preparation and characterisation of Ag incorporated Al₂O₃ nanocomposite films obtained by sol‐gel method

Ivanova

Harizanova

Koutzarova

et al. 2012

Cryst. Res. Technol.

View full text Add to dashboard Cite

Sol-gel route has been applied for a deposition of the thin films of aluminum oxide and Ag embedded in Al 2 O 3 films. The films are spin-coated on Si and quartz substrates with the film thickness of 120 nm. XRD analysis has been used for the determination of the film structure. FTIR spectroscopy is applied for studying vibrational properties of the obtained coatings. Optical characterization is done by UV-VIS spectroscopy. The formation of Ag nanoparticles has been confirmed by XRD and optical data. The sol-gel process is found to be useful technology for incorporation of Ag nanoparticles in the metal oxide matrices.

show abstract

“…Transmittance above 90 % and 92 % were reported for a flowerlike film on polyethyleneterephthalate (PET) (Tadanaga et al 2003) and a smooth alumina film on fused quartz (Hu et al 2014), respectively. An increase of transmittance of alumina films by increasing the annealing temperature was reported, too (Murali and Thirumoorthy 2010). Decrease of transmittance and reflectance of flowerlike coatings when increasing the duration of immersion in boiling water were explained by appearing index of refraction and porosity gradients (Yamaguchi et al 2007).…”

Section: Optical Properties (Refractive Index Transmittance Reflectmentioning

confidence: 96%

“…Another variant of sol preparation is the "acrylamide route" (Douy and Odier 1989). A mixture of a basic solution of aluminum chloride with acrylamide and N,N, bis-acrylamide was prepared, and ammonium persulfate was added as gelling agent to obtain a viscous solution usable in a dip-coating process (Murali and Thirumoorthy 2010).…”

Section: Preparation and Properties Of Coating Sols Preparation Of Comentioning

confidence: 99%

Alumina Thin Films

Nofz¹

2016

Handbook of Sol-Gel Science and Technology

View full text Add to dashboard Cite

This chapter gives an overview over preparation, properties, and applications of alumina thin films. The preparation of polymeric and colloidal alumina sols and their deposition on diverse substrate materials with different geometries are described first. Consideration of properties (surface tension, particle size, viscosity, aging of the sols, and their optimization by using certain additives) is included, too. A description of posttreatments of the coatings, which initiate phase transformations and also determine their microstructure, completes the part on coating preparation. Data on adhesion, thickness, surface roughness, and mechanical, textural as well as optical properties of alumina thin films are provided in a further paragraph. In a third main part, experience concerning possible applications, such as (i) membranes for catalysis, separation, and filtration, (ii) barrier layers against electrochemical and high-temperature corrosion or interdiffusion of ions between different phases, (iii) mechanical protection, (iv) sensor construction, (v) improvement of optical properties, as well as (vi) achieving water repellency, is summarized.

show abstract

Characteristics of sol–gel deposited alumina films

Cited by 22 publications

References 18 publications

Synthesis of α-alumina from a less common raw material

Synthesis of α-alumina from a less common raw material

Preparation and characterisation of Ag incorporated Al₂O₃ nanocomposite films obtained by sol‐gel method

Alumina Thin Films

Contact Info

Product

Resources

About

Characteristics of sol–gel deposited alumina films

Cited by 22 publications

References 18 publications

Synthesis of α-alumina from a less common raw material

Synthesis of α-alumina from a less common raw material

Preparation and characterisation of Ag incorporated Al2O3 nanocomposite films obtained by sol‐gel method

Alumina Thin Films

Contact Info

Product

Resources

About

Preparation and characterisation of Ag incorporated Al₂O₃ nanocomposite films obtained by sol‐gel method