Structural characterization of nickel oxide/hydroxide nanosheets produced by CBD technique

TAŞKÖPRÜ T., ZOR M., TURAN E.

Materials Research Bulletin, vol.70, pp.633-639, 2015 (SCI-Expanded, Scopus)

  • Publication Type: Article / Article
  • Volume: 70
  • Publication Date: 2015
  • Doi Number: 10.1016/j.materresbull.2015.05.032
  • Journal Name: Materials Research Bulletin
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.633-639
  • Keywords: Nickel oxide/hydroxide, SEM, Raman, FT-IR, BET, Optical band gap, ELECTROCHEMICAL PERFORMANCE, OPTICAL-PROPERTIES, THIN-FILMS, OXIDE, ELECTROCHROMISM, BETA-NI(OH)(2)
  • Anadolu University Affiliated: Yes

Abstract

© 2015 Elsevier Ltd. All rights reserved.Nickel hydroxide samples were deposited onto glass substrates using Ni(NO3)2·6H2O and aqueous ammonia by chemical bath deposition technique. The influence of pH of solution was investigated by means of X-ray diffraction, field emission scanning electron microscopy, Fourier transform infrared, Raman spectroscopy, optical absorption and BET analysis. The as-deposited samples were identified as β-Ni(OH)2, were transformed into NiO after heat treatment in air at 500 °C for 2 h. Porous nickel oxide nanosheets are obtained by heating nickel hydroxide nanosheets. The optical transitions observed in the absorbance spectra below optical band gap is due to defects or Ni2+ vacancies in NiO samples. The band gap energy of NiO samples changes between 3.37 and 3.52 eV depending on the pH values.