Optical properties and thermal durability of copper cobalt oxide thin film coatings with integrated silica antireflection layer

Abstract

Optical properties and thermal durability of copper cobalt oxide thin film coatings with integrated silica antireflection layer, Ceramics International, http://dx.doi.org/10.1016/j. ceramint. 2014.08.012 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. antireflection (AR) layer have been deposited on the top of aluminum substrates using a simple sol-gel dip-coating method. Reflectance spectra of the coatings were generated using spectroscopic methods while the coatings were subjected to an accelerated thermal durability test. The addition of silica changed the reflectance spectra of coatings within the wavelength range of 0.3-15.4 µm. The absorptance decreased with the increase of the withdrawal rate in range of 10-40 mm/min, while the emittance increased with the increase of the withdrawal rate. The optimum optical parameters for this study were absorptance, α S = 84.96%; emittance, ε T = 5.63% corresponding to the coating with a silica AR layer at withdrawal rate of 10 mm/min. The coatings with the silica AR layer were shown to be thermally durable in which no discernible 'cracking' phenomenon was observed. The degradation of the coatings with the silica AR layer was predominantly governed by temperature changes rather than exposure time.

Structural, optical, and mechanical properties of cobalt copper oxide coatings synthesized from low concentrations of sol-gel process

“…and as thermoelectric materials . The physicochemical, electrochemical, magnetic, conductivity, and thermal properties have been substantially studied by various researches . A major conclusion reached is that the chemical nature and the compositions of the precursors, as well as the annealing treatments influence the properties of these mixed oxides, i.e., properties are influenced by the preparation method .…”

“…In our previous work, we studied the physico‐chemical properties of cobalt‐based mixed metal oxide (M x Co y O z with M = Mn, Cu, Ni) and Co x Cu y O z –SiO 2 coatings on Al substrate synthesized via sol–gel method at annealing temperature of 500 °C. The optical properties of the coatings exhibited distinctive spectral selectivity in the solar wavelengths region (<2.5 μm) making them promising material for solar selective absorber (SSA) applications . In present work, we synthesize Co x Cu y O z thin film coatings via sol–gel process using low concentration of [Cu] and [Co] sol precursor (<0.2 M).…”

3d Transition Metal Oxide based Sol gel Derived Coatings for Photothermal Applications

“…Wide-spread applications and steadily increasing scientific interests on metal oxides based films have been dedicated to the development of new species of solar selective coatings with superior properties. Since the solar selective surfaces are the easiest and most direct way of harvesting the solar energy, in recent years, transition metal oxides based thin film coatings have received significant perception for mid and high temperature applications [1][2][3][4][5][6]. A spectrally selective surface is, generally, used to improve the photothermal conversion solar energy in the visible range while 100% of the IR energy is reflected back from the absorbing surface indicating that no heat is lost through thermal radiation.…”

“…In such an approach, the reflector is coated with a highly absorbing layer over the visible solar spectrum while the infrared region is made transparent. [3][4][5][6][7][8]. Transition metal oxides based thin films with general composition AB 2 O 4 , where A is a divalent metal ion occupying the tetrahedral A-sites while B is a trivalent ion occupying at octahedral B-sites e.g., CuFe 2 O 4 , CuCo 2 O 4 , and CuMn 2 O 4 are studied by different groups [9].…”

Structural Thermal Stability of Graphene Oxide-Doped Copper–Cobalt Oxide Coatings as a Solar Selective Surface

“…The their practical applications as catalysts in oxygen evolutions reactions (EOR) [9] . There have been properties of sol-gel derived Cu-Co oxide coatings have been investigated by other groups [10,11] .…”