Preparation of selective absorbers based on CuMn spinels by dip-coating method

Solar absorptance of copper–cobalt oxide thin film coatings with nano-size, grain-like morphology: Optimization and synchrotron radiation XPS studies

“…Interestingly, a wavy curve with peak (interference peak) and valley (absorption edge) was detected at the shorter wavelengths range of spectra. A similar phenomenon was also reported by other researchers [47,51]. Generally, the interference peak and the absorption edge shift towards to longer wavelengths when increasing the dip-speed and concentrations.…”

Developments in the synthesis of flat plate solar selective absorber materials via sol–gel methods: A review

“…Bayon et al [28] reported that CuMn-spinel thin films on aluminum foil synthesized by a sol-gel-like dip-coating method and followed by airsintering at 500 °C could be used as a low temperature application of SSA. Since the synthesis process was conducted under the Consortium Agreement of Confidentiality (patent), no detail about solution composition was provided [111].…”

“…High emittance values are the consequence of the incorporation of silica as a matrix and/or an underlayer because the silica absorbs too much solar radiation in IR range [24,36,50,59], while silica as an AR layer has a more positive effect because it can improve absorptance with a non-significant influence on the increase of the surface emittance value [28,33,51]. Silica as an AR layer is frequently synthesized thinner than the silica as a matrix or an underlayer, so in the construction of SSA protective layer (matrix or underlayer) involving silica, the protective layer thickness should be an important factor to be optimized.…”

“…Some well-known examples include electroplated black chrome (Cr-Cr 2 O 3 ) and nickel-pigmented anodic Al 2 O 3 (synthesized via the electroplating/electrochemical method) as well as evaporated titanium nitride film (TiNO x ) and nickel-nickel oxide (Ni-NiO x ) (synthesized via a vacuum deposition/sputtering method) [9,22,[28][29][30][31][32][33].…”

“…In this context, sol-gel techniques meet these criteria and they are potentially very promising techniques [28,[41][42][43]. However, the application of these techniques to produce SSA materials is much less common than electrochemical or vacuum-based techniques.…”