Structure and optical properties of Ag–Al2O3 nanocermet solar selective coatings prepared using unbalanced magnetron sputtering

Barshilia, Harish C.; Kumar, Prashant; Rajam, K.S.; Biswas, A.

doi:10.1016/j.solmat.2011.01.034

Cited by 135 publications

(63 citation statements)

References 35 publications

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“…3 show that the plasmon was centered at 504 nm for deposited samples with 0.1 mol of Ag(NO 3 ), at 506 nm for deposited samples with 0.05 mol, at 497 nm for deposited samples with 0.02 mol and at 475 nm for deposited samples with 0.01 mol of Ag(NO 3 ) content. Barshilia et al [1] found for the same Cermet, Al 2 O 3 -Ag, deposited by sputtering that the position of the plasmon is located at 610 nm, approximately. In the work of Yang Li, related to coatings of nano-composite of SiO 2 -Ag, it is reported that the position of the peak has a blue-shift and the intensity of the peak decreases with the decrease in the size of the particles of Ag, probably by the non-homogeneity of the particles [22].…”

Section: Discussionmentioning

confidence: 95%

“…The research and development of solar collectors or solar energy materials (materials capable of converting solar radiation into thermal energy) has recently increased due to the high demand, which has been directed toward the profitable use of solar energy [1][2][3]. A category of materials used for this purpose is one that is given by a coating type composed of metal-dielectric material.…”

Section: Introductionmentioning

confidence: 99%

“…For applications of such solar collectors, it is necessary that these materials are resistant to high temperatures without degradation of the high selectivity (absorptance/emittance ratio) [4]. Within the techniques developed for the fabrication of different Cermets, there are those that are based on physical or chemical principles such as Sputtering [1,6,13], DipCoating [7,14], Evaporation [5,15,16], Anodizing [17,18], among others. However, very rarely the Ultrasonic Spray Pyrolysis (USP) technique has been used to synthesize such materials.…”

Section: Introductionmentioning

confidence: 99%

“…The USP technique has been used to get a wide variety of materials, mainly metal oxides for different applications [19]. Research in the Al 2 O 3 -Ag Cermet, as selective materials to solar radiation, has been carried out very successively on coatings deposited by sputtering [1]. On the other hand, silver has been used as a metal component in various matrices such as SiO 2 and in partially oxidized amorphous silicon (a-Si) [6,13,22], whereas aluminum oxide has been the host material for different metal components [4,8,[15][16][17][18]23,24].…”

Section: Introductionmentioning

confidence: 99%

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Spray-pyrolyzed Al2O3-Ag Nano-Cermets coatings for solar absorbers

et al. 2018

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In this work, it is shown the feasibility for obtaining silver nanoparticles by ultrasonic spray pyrolysis and their simultaneous incorporation during deposition of thin layers of aluminum oxide to get a Cermet coating of Al2O3-Ag. The synthesis of these Cermets was achieved on the basis of both the simultaneous pyrolysis of silver nitrate and aluminum acetylacetonate on different substrates: Quartz, glass, crystalline silicon (c-Si), and titanium at temperatures of 500, 550 and 600• C. The structural properties of the Cermets were studied by ScanningElectron Microscopy, Atomic Force Microscopy and X-ray diffraction. For the optical properties, UV-vis spectroscopy was used to obtain the optical Absorbance of the Cermets, while the Reflectance was obtained by UV-vis-IR spectroscopy measurements. UV-Vis spectroscopy showed that the intensity of the absorption peak (plasmon) was limited to the concentration of silver nitrate, and it shifted toward shorter wavelengths with the decrease in the size of the Ag nanoparticles inside the Cermets. The plasmon position of Ag nanoparticles in the different samples was found to be centered at 504 nm, 506 nm, 497 nm and 475 nm for samples deposited with 0.1 mol, 0.05 mol, 0.02 mol, and 0.01 mol of Ag(NO 3 ), respectively. The shape of the Ag nanoparticles was approximately spherical, ranging from 4 nm to 35 nm, and their concentration was proportional to the concentration of Ag(NO3) included in the spray solution. By means of the UV-Vis Spectroscopy-IR and FT-IR, in the best of cases, a solar absorptance of 0.83 and an infrared thermal emittance of 0.14, for a sample of Al2O3-Ag prepared with 0.1 mol of Ag(NO 3 ) in the precursor solution, were obtained.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spray-pyrolyzed Al2O3-Ag Nano-Cermets coatings for solar absorbers

et al. 2018

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“…, Mo-SiO2 [8], W-Al2O3 [9], Zr-ZrO3 [10], HfMoN/HfON/Al2O3 [11], AlNi-Al2O3 [12], Ag-Al2O3 [13], NbTiON/SiON [14], TiAlN/TiAlON/Si3N4 [15 …”

mentioning

confidence: 99%

Absorption Rate Variation of TiNO<sub>x</sub>/Ti/Al Films Depending on N<sub>2</sub> Gas Flow Rate

Kim¹,

Jang²,

Kim³

2015

Journal of the Korean Institute of Electrical and Electronic Ma

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Ti was deposited on the Al substrate using DC magnetron sputtering with changing the N2 gas for the possible application of a solar absorbing layer. N2 gas ranged from 50 to 75 sccm was systematically applied in the 5 sccm interval and the variation of the absorption rate was investigated. Microstructural examination and elemental analysis indicate that Ti was reacted with N2 gas and formed TiNOx compound. As compared with the film without any exposure of N2 gas, absorption rate improved by more than 20%. Typically the average absorption of TiNOx fim with 65% of N2 gas was about 99% in the visible range, and the average absorption was more than 90% in the infrared absorption region respectively.

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