, Volume 13, Issue 6, pp 2099–2109 | Cite as

Broadband Solar Absorption Enhancement in a Silver–Epoxy Nanocomposite for Use as Selective Coating

  • Enrique Barrera
  • Federico González
  • Celso Velásquez
  • María Luisa Ojeda
  • Marciano Sánchez
  • Víctor Rentería-Tapia


This paper reports the optical properties of a black silver–epoxy nanocomposite deposited on copper substrate for use as selective solar absorber. The silver nanoparticles at 3 wt% have been formed in situ in an epoxy resin in presence of organic solvent at room temperature. The nanocomposite exhibited a strong broadband light absorption in the entire visible spectrum. Atomic force microscopy images showed mixtures of spherical and elongated nanoparticles very close together (spacing much smaller than light wavelength) and predominantly clusters of them. The origin of the wide-band absorption is due to the superposition of all excitations of dipole and high-order modes coming from nanoparticles of different diameters (of 10–80 nm) and elongations (length of 80–500 nm). In order to evaluate the solar optical properties, the black silver–epoxy nanocomposite was deposited on copper substrate by the roll coating method and subsequently thermocured in air at 100 °C. The spectral data of the thermocured coatings in air showed significant decrease of the reflectance (< 13%) in the wavelength region from 200 to 1300 nm. The reduction in reflectance is explained in terms of the light trapping by forward scattering in the nanoparticles. The silver–epoxy nanocomposite deposited on a metal substrate for use as solar selective absorber is very attractive due to the easiness of its deposition, very good adherence, low-cost processing, high thermal stability, and low weight of coating per square meter of substrate (1.4 g/m2), and finally, it can be applied over large substrate areas.


Silver nanoparticles Selective solar absorber Black coating Broadband enhancement Epoxy resin 



Also special thanks to LDRX–UAMI (T-128) for GARDX measurement and to Samuel Tehuacanero by SEM measurements.

Funding Information

The authors acknowledge financial support from the CONACYT and COECYTJAL–UdG under grant numbers 166032 and 5–2010–1–917, respectively.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Enrique Barrera
    • 1
  • Federico González
    • 1
  • Celso Velásquez
    • 2
  • María Luisa Ojeda
    • 2
  • Marciano Sánchez
    • 2
  • Víctor Rentería-Tapia
    • 2
  1. 1.Departamento de Ingeniería de Procesos e HidráulicaUniversidad Autónoma Metropolitana—IztapalapaCiudad de MexicoMexico
  2. 2.Departamento de Ciencias Naturales y Exactas, Centro Universitario de los VallesUniversidad de GuadalajaraAmecaMexico

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