Enhanced photoluminescence in electrodeposited NiO nanowalls mediated by plasmonic Au nanoparticle

Pranab Biswas, Sung Doo Baek, Jong Woo Kim, Seong Rae Cho, Do Kyun Kwon, Su Jeong Lee, Jae Min Myoung

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5 Citations (Scopus)


A comparative photoluminescence (PL) study of NiO nanowalls electrochemically deposited on indium-tin-oxide (ITO)- and gold (Au)-coated glass substrates was demonstrated. The NiO nanowalls had with an average diameter of 2–5 μm and a thickness of 50 nm. For Au-coated substrates, the nanowalls were observed to be decorated by spherical Au nanoparticles (NPs), whereas no NP was found for ITO-coated substrates. The X-ray diffraction (XRD) patterns revealed a dominant growth of NiO along (200) direction. For both the substrates, the X-ray photoelectron spectra (XPS) confirmed elemental purity of NiO with an oxidation state of +2. After eliminating the substrate effect, the nanowalls grown on Au-coated substrates revealed prominent XPS peaks related to metallic Au. Room temperature PL spectra for Au-decorated sample showed a remarkably intense peak at 544 nm corresponding to green light. The peak intensity was observed to be 30 times higher for Au-coated substrates with a wide red-shift. This optical enhancement was attributed to the far-field and near-field radiative effects caused by plasmonic resonance of Au NPs in the vicinity of high-k dielectric NiO nanowalls.

Original languageEnglish
Pages (from-to)63-68
Number of pages6
JournalMaterials Chemistry and Physics
Publication statusPublished - 2017 Nov 1

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics


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