Abstract:
Copper oxide thin film coatings have been successfully coated on reflective
aluminium substrates via facile sol–gel dip-coating route for spectrally selective
absorber (SSA) application. For quantitatively analysis, the reflectance spectra
obtained from UV-Vis-NIR and FTIR equiped with the integration spheres were
used to measure the absorptance and emitance values, respectively. To optimize
the performance, relevant parameters such as the concentration of sol precursor
and the dip-drying cycle were investigated. The increase of the concentration of
copper sol precursor in range of 0.1 - 0.3 M increased the absorptance value,
likewise with the increase of the dip-drying cycles. The maximum absorptance of
=72% with a spectrally selective absorber profile was achieved by a SSA
material synthesized using 0.3 M copper nitrate, 0.3 M propionic acid, and 8
times dip-drying cycles. The emitance value of =6.63% for this coating was
recorded. Good optical performance of spectrally selective absorber and the
operational simplicity of the synthesis process make this coating have high
prospect as spectrally selective absorber material
