Sol-gel derived Li and Mg incorporated nickel oxide particles: An investigation on structural and optical properties

Akalın S. A., Erol M., Uzunbayir B., Oğuzlar S., Yıldırım S.

OPTICAL MATERIALS, vol.118, 2021 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 118
  • Publication Date: 2021
  • Doi Number: 10.1016/j.optmat.2021.111223
  • Journal Name: OPTICAL MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, Computer & Applied Sciences, INSPEC
  • Keywords: Nickel oxide, Sol-gel, Photoluminescence, Doping
  • Dokuz Eylül University Affiliated: Yes

Abstract

In this study, NiOx, Li:NiOx, and Li,Mg:NiOx powders (Li(0.05)MgaNi((0.95-a))O(x), a: 0.00; 0.05; 0.1; 0.15; 0.30) were produced by sol-gel method. Preformed powders were annealed at 350 degrees C, 500 degrees C, and 650 degrees C to monitor structural changes. Functional groups, compositions, phase structures, elemental analysis, morphology, and optical properties were investigated by Fourier transforms infrared spectroscopy (FTIR), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and photoluminescence measurements (PL), respectively. The incorporation of Li+ and Mg2+ into NiOx structure was successfully accomplished as seen on XPS results. Crystallite size decreased upon increasing dopant concentration. All of the powders, with bi-exponential decay curves, exhibited maximum emission peak at 550 nm under the excitation at 362 nm. A decrease in both emission based intensity and average decay time values was observed at addition of Li+ and Mg2+ into structure with respect to the pristine NiOx.