Spray-pyrolyzed Al_(2)O_(3)-Ag Nano-Cerments coatings for solar absorbers

• I. Fernández-Peña ^[3] ; A. Alvarado-Palacios ^[3] ; E. Barrera-Calva ^[4] ; J. Calderón-ARenas ^[3] ; M. García ^[1] ; C. Falcony ^[2] ; R. Fragoso ^[2] ; G. Alarcón-Flores ^[3] ; C. Paredes-Sánchez ^[3] ; M. Aguilar-Frutis ^[3]
  1. [1] Universidad Nacional Autónoma de México

     Universidad Nacional Autónoma de México

     México

     
  2. [2] Instituto Politécnico Nacional

     Instituto Politécnico Nacional

     México

     
  3. [3] Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, México
  4. [4] Universidad Autónoma Metropolitana-Iztapalapa, México

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• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 64, Nº. 4, 2018, págs. 392-398
• Idioma: inglés
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• Resumen

  • 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 Al_(2)O_(3)-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 Scanning Electron 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(NO_(3)) included in the spray solution. By means of the UV-Vis SpectroscopyIR 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 Al_(2)O_(3)-Ag prepared with 0.1 mol of Ag(NO_(3)) in the precursor solution, were obtained.