Back to Search
Start Over
Structural, optical, and mechanical properties of cobalt copper oxide coatings synthesized from low concentrations of sol-gel process
- Source :
- physica status solidi (a). 213:3205-3213
- Publication Year :
- 2016
- Publisher :
- Wiley, 2016.
-
Abstract
- Thin films of CoxCuyOz have been coated on aluminum substrates via sol–gel route using low concentration of copper and cobalt precursors at annealing temperatures in range of 500–650 °C. The coatings were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis-NIR spectrophotometry, and nanoindentation. The XRD analysis in 2θ-range of 30°–42° revealed that the coatings exhibited low crystallinity of CoCu2O3, CoCuO2, and CuCoO2. The surface bonding structure analyzed using XPS indicated that the coating contained: Cu (tetrahedral Cu+ and octahedral Cu2+), Co (octahedral Co3+, tetrahedral Co2+, and mixed Co2+ and Co3+), and O (lattice, surface, and sub-surface oxygens). The optical properties characterized using UV-Vis-NIR showed that the reflectance spectra of coatings formed a spectrally solar selective absorber profile associated with the interference peaks and the absorption edges around wavelengths of below 1.2 μm. The maximum absorptance (α = 75.8%) was shown by coating synthesized at 500 °C. The mechanical properties of coatings showed that the increase of annealing temperature increased the coating's hardness (H) and the elastic modulus (E) due to the enhancement of the [CoCuO2/CuCoO2]:[CoCu2O3] oxide phases ratio, as the result, an excellent stability of the wear resistance (H/E) of around ∼0.035 was recorded.
- Subjects :
- Copper oxide
Materials science
Annealing (metallurgy)
Analytical chemistry
Oxide
chemistry.chemical_element
02 engineering and technology
engineering.material
010402 general chemistry
01 natural sciences
Crystallinity
chemistry.chemical_compound
Coating
X-ray photoelectron spectroscopy
Materials Chemistry
Electrical and Electronic Engineering
Thin film
Metallurgy
Surfaces and Interfaces
021001 nanoscience & nanotechnology
Condensed Matter Physics
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
chemistry
engineering
0210 nano-technology
Cobalt
Subjects
Details
- ISSN :
- 18626300
- Volume :
- 213
- Database :
- OpenAIRE
- Journal :
- physica status solidi (a)
- Accession number :
- edsair.doi...........b5bbb4c99c82fe94baa47a9cc07e7cab