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

Graphical abstract: SEM images of (a) as deposited β-Ni(OH)2 and (b) NiO samples deposited with pH 10 solution. The inset figures shows the absorbance spectra of (a) β-Ni(OH)2 and (b) NiO samples. - Highlights: • The formation of β-Ni(OH){sub 2} and NiO were confirmed with XRD, SEM, FT-IR and Raman. • Porous nickel oxide was synthesized after heat treatment of nickel hydroxide. • The increase in pH value changes the nanoflake structure to hexagonal nanosheet. • On increasing the pH from 8 to 11, the band gap decreases from 3.52 to 3.37 eV. - Abstract: Nickel hydroxide samples were deposited onto glass substrates using Ni(NO{sub 3}){sub 2}·6H{sub 2}O 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){sub 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 Ni{sup 2+} vacancies in NiOmore » samples. The band gap energy of NiO samples changes between 3.37 and 3.52 eV depending on the pH values.« less
Authors:
 [1] ;  [2] ; ;  [1]
  1. Department of Physics, Anadolu University, Eskişehir 26470 (Turkey)
  2. (Turkey)
Publication Date:
OSTI Identifier:
22475949
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 70; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; DEFECTS; FIELD EMISSION; FOURIER TRANSFORMATION; GLASS; INFRARED SPECTRA; NANOSTRUCTURES; NICKEL HYDROXIDES; NICKEL IONS; NICKEL NITRATES; NICKEL OXIDES; POROUS MATERIALS; RAMAN SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; SUBSTRATES; VACANCIES; X-RAY DIFFRACTION