Tin-oxide-coated anodized aluminium selective absorber surfaces I. Preparation and characterization

Origin of solar thermal selectivity and interference effects in nickel–alumina nanostructured films

“…Interference effects are shown to have an important role in the optical behavior of these films [11] and the main influence of each parameter is studied. For this purpose, samples of Ni inclusions into nanoporous anodized aluminum (AAO for anodized aluminum oxide) were electrochemically prepared [7].…”

“…For this purpose, samples of Ni inclusions into nanoporous anodized aluminum (AAO for anodized aluminum oxide) were electrochemically prepared [7]. This technique is advantageous against other techniques based on vacuum systems because it can be applied to large surfaces at relative low temperatures by low cost methods [4,11]. Thermal stability of Ni/Al 2 O 3 selective surfaces for the corresponding working temperature must also be taken in consideration and was already studied [12,13].…”

“…These surfaces increase the efficiency of solar energy conversion into thermal energy. Thin films of metal-dielectric composites, like nanoporous alumina (Al 2 O 3 ) with Ni inclusions [3,4], among many others, are currently being widely studied for this application [5][6][7][8][9][10][11][12][13] due to the increased interest in the development and efficient use of renewable energy sources. Several different metal inclusions, like Cu, Au, Ag, Mo, Cr, Co, Pt, and W, have been reported and studied [1,[14][15][16][17][18][19].…”

98/03946 Spectroscopic characterization of Al2O3-Ni selective absorbers for solar collectors

“…During pigmentation these pores are filled with the transition metals most of which lie at the bottom of the wells away from the surface. Depth profiles using Auger Electron Spectroscopy (AES) [7] and Glow Discharge Optical Emission Spectrometry (GDOES) [8] revealed a small concentration of Ni or Co on the surface which increased on moving away from the surface and reached the highest values near the aluminum oxide/aluminum metal interface. XPS studies on Co-pigmented aluminum indicated that cobalt is partially in metallic form [7].…”

XPS characterization of Co and Cr pigmented copper solar absorbers

“…Equally important is the nature and chemical state of the pigments used. Transition metal salts of Cr, Co and Ni are the most common pigments and Al, Cu or stainless steel are used as substrates [1][2][3][4][5][6][7][8][9][10][11][12].…”