2014 Volume 82 Issue 9 Pages 752-754
High infrared-absorption films having low cost and light weight are indispensable for infrared sensors. We developed IR-adsorption coatings with low-reflectance and low-transmittance at wavelengths of 3–13 µm, based on a copper electroplating film pretreated with chemical etching and subsequent blackening. The chemical etching and blackening respectively produced columnar and feather-shaped structures on a copper surface. The reflectance and the transmittance of the films were below 15% and below 1% at wavelengths of 3–13 µm, respectively. The current coating technique might be useful to develop high absorption, low cost, and lightweight infrared absorbers.