Optical properties of selectively absorbing r.f. sputtered NiAl2O3 composite films

Sathiaraj, T.S.; Thangaraj, R.; Sharbaty, H. Al; Agnihotri, O.P.

doi:10.1016/0040-6090(91)90256-w

Cited by 19 publications

(6 citation statements)

References 12 publications

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“…RF magnetron sputtering was used to prepare Ni-Al 2 O 3 cermet films by Sathiaraj et al 21,22 . The metal fractions of the cermet layers were varied by using targets with different compositions and by co-sputtering the As a comparison, the reflectance spectrum of the as-deposited film is also included (dashed curve).…”

Section: Spectral Selectivity Of Cermet-based Absorbersmentioning

confidence: 99%

“…Since the rst studies on spectrally selective coatings by Tabor and Gier in 1955 and aer, [14][15][16] investigations of various spectrally selective absorbers have been carried out, such as black chrome coatings prepared by electrodeposition for solar hot water applications, [17][18][19][20] Ni-Al 2 O 3 cermet-based coatings prepared by sputtering and solution-chemical methods, [21][22][23] Cr/ Cr x O y /Cr 2 O 3 multilayer absorber coatings, 24 thickness-sensitive spectrally selective (TSSS) paints including organic black carbon and inorganic FeMnCuO x pigment, 25 and thickness-insensitive spectrally selective (TISS) paints. 26,27 Based on the conguration of coatings and the absorption mechanism, these spectrally selective absorbers can be classied into six types: 9 (1) intrinsically selective, (2) semiconductor-on-metal coatings, (3) multilayer stacks, (4) metal-dielectric (cermet) composites, (5) textured surfaces, and (6) selectively transmitting coatings on blackbody-like absorbers.…”

Section: Selective Absorber Theorymentioning

confidence: 99%

“…Craighead et al investigated the spectral selectivity of a Ni-Al 2 O 3 cermet deposited by duel-electron-beam evaporation and a high solar absorptance of 0.94 at air mass 2 was achieved. 23 RF magnetron sputtering was used to prepare Ni-Al 2 O 3 cermet lms by Sathiaraj et al 21,22 The metal fractions of the cermet layers were varied by using targets with different compositions and by cosputtering the target with additional nickel pellets arranged along the magnetron ring. The reection spectra of the Ni-Al 2 O 3 cermet layer (65 nm thick) with and without a SiO 2 anti-reection layer are shown in Fig.…”

Section: Al 2 O 3 -Based Cermetsmentioning

confidence: 99%

See 2 more Smart Citations

A review of cermet-based spectrally selective solar absorbers

Cao

McEnaney

Chen

et al. 2014

Energy Environ. Sci.

427

285

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Spectrally-selective solar absorbers harvest solar energy in the form of heat. Solar absorbers using cermet-based coatings demonstrate a high absorptance of the solar spectrum and a low emittance in the infrared (IR) regime. Extensive work has been done to optimize cermet-based solar absorbers to achieve high performance by exploring different cermet (ceramic-metal composite) materials and film configurations through different preparation techniques such as electrodeposition, sputtering, pulsed laser deposition, and solution-based methods. In this article, we review the progress of cermet-based spectrally-selective absorbers with high solar absorptance and low thermal emittance, such as Cr 2 O 3 , Al 2 O 3 , AlN, SiO 2 , and ZrO 2 based cermets as absorption layers. We also present an outlook for cermet-based spectrally-selective absorbers with high thermal stability and high conversion efficiency from sunlight to heat.

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Section: Spectral Selectivity Of Cermet-based Absorbersmentioning

confidence: 99%

Section: Selective Absorber Theorymentioning

confidence: 99%

Section: Al 2 O 3 -Based Cermetsmentioning

confidence: 99%

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A review of cermet-based spectrally selective solar absorbers

Cao

McEnaney

Chen

et al. 2014

Energy Environ. Sci.

427

285

View full text Add to dashboard Cite

show abstract

“…Many metals in nanoscopic form strongly absorb and scatter visible light, and therefore give rise to a rich variety of colors. They have thus been used as pigments in the fine arts, − photographic development, and in industrial metal colorizing processes. , Over the past two decades, interest in nanoscopic metal particles has grown well beyond aesthetic considerations, as they find application in selective solar materials, − cytology and molecular biology, surface-enhanced spectroscopy, − and nonlinear optics.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Second-Harmonic Generation Studies of Noncentrosymmetric Gold Nanostructures

et al. 1999

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Noncentrosymmetric gold nanoparticle structures were prepared in porous anodic aluminum oxide films via a modified template synthesis procedure. The noncentrosymmetric structures are defined by two gold particles in close proximity (ca. 22 ( 8 nm end to end) within a single host oxide pore, one having average dimensions of a ) 37 ( 6 nm and b ) 26 ( 3, and the other having dimensions of a ) 27 ( 5 nm and b ) 26 ( 3 nm, where a is the axial length and b is the diameter of the quasi-cylindrical structures. Linear UV/vis polarization spectra of the gold particle/porous alumina film composites show plasmon resonance bands whose λ max incidence angle dependence is similar to composites containing centrosymmetric gold structures, where the incidence angle is defined with respect to the surface normal. Second harmonic generation (SHG) studies using an incident wavelength of 780 nm indicate that SHG intensities under s-polarization are low and independent of incidence angle (θ) for composites containing centrosymmetric and noncentrosymmetric gold nanostructures. However, in p-polarization, both composites show an increase in SHG counts with θ, with the noncentrosymmetric structures showing a higher SHG signal than their centrosymmetric counterparts. These results are consistent with local-field enhancements arising from long particle axis dipolar plasmon resonances.

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“…Solar selective absorbers can be formed by several techniques such as DC reactive magnetron sputtering [8], RF magnetron sputtering [9,10], electrochemical approach [11,12], spin coating [2,13], electroless plating [14], electrodeposition [15,16], chemical oxidation [17], cathodic arc evaporation [18,19] and spray pyrolysis [20,21].…”

Section: Introductionmentioning

confidence: 99%

Spray pyrolytically grown NiAlOx cermets for solar thermal selective absorbers: spectral properties and thermal stability

Khatibani

Rozati

2016

Bull Mater Sci

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After deposition of NiAlOx thin films on stainless-steel substrates by the spray pyrolysis technique, various properties of the films were investigated using Fourier transform infrared spectroscopy, UV-visible reflectance spectrophotometry, energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Optical quantities were determined using reflectance spectra in the relevant spectrum region. At first the optimal substrate temperature was selected and then different nickel to aluminium ratios were examined to find the efficient solar absorber. The SEM revealed changes in morphology due to different molar ratios. The XRD of the selected sample showed a mixture of nickel and nickel oxide phases with the strong presence of substrate peaks and without the presence of alumina phase while in the EDX test the peaks corresponding to O, Al and Ni appeared. Long-term thermal stability study was performed by means of performance criterion concept.

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Optical properties of selectively absorbing r.f. sputtered NiAl2O3 composite films

Cited by 19 publications

References 12 publications

A review of cermet-based spectrally selective solar absorbers

A review of cermet-based spectrally selective solar absorbers

Synthesis and Second-Harmonic Generation Studies of Noncentrosymmetric Gold Nanostructures

Spray pyrolytically grown NiAlOx cermets for solar thermal selective absorbers: spectral properties and thermal stability

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