Formation and characterization of infrared absorbing copper oxide surfaces

Arslan B., Demirci G., Erdogan M., Karakaya İ.

APPLIED SURFACE SCIENCE, vol.402, pp.218-224, 2017 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 402
  • Publication Date: 2017
  • Doi Number: 10.1016/j.apsusc.2017.01.011
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.218-224
  • Keywords: Chemical conversion, Reflective coating, Absorbing coating, Cupric oxide, Cuprous oxide, THIN-FILMS, CUO NANOSTRUCTURES, NANOWIRES, GROWTH, TRANSITION, MECHANISM, WATER, CU2O


Copper oxide formation has been investigated to combine the advantages of producing different size and shapes of coatings that possess good light absorbing properties. An aqueous blackening solution was investigated and optimum composition was found as 2.5 M NaOH and 0.225 M NaClO to form velvet copper oxide films. A two-step oxidation mechanism was proposed for the blackening process by carefully examining the experimental results. Formation of Cu2O was observed until the entire copper surface was covered at first. In the second step, Cu2O surface was further oxidized to CuO until the whole Cu2O surface was covered by CuO. Therefore, blackened copper surfaces consisted of Cu2O/CuO duplex oxides. Characterization of the coatings were performed in terms of microstructure, phase analysis, chemical state, infrared specular and total reflectivity by SEM, XRD, XPS, FUR and UV-vis spectrophotometry, respectively.(C) 2017 Elsevier B.V. All rights reserved.