Metal catalyst-assisted growth of GaN nanowires on graphene films for flexible photocatalyst applications

Jun Beom Park, Nam Jung Kim, Yong Jin Kim, Sang-Hyup Lee, Gyu Chul Yi

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We report the growth of high-areal-density GaN nanowires on large-size graphene films using a nickel (Ni) catalyst-assisted vapor-liquid-solid (VLS) method. Before the nanowire growth, the graphene films were prepared on copper foils using hot-wall chemical vapor deposition and transferred onto SiO2/Si substrates. Then, for catalyst-assisted VLS growth, Ni catalyst layers with thickness of a few nanometers were deposited on the graphene-coated substrates using a thermal evaporator. We investigated the effect of the Ni catalyst thickness on the formation of GaN nanowires. Furthermore, the structural and optical characteristics of GaN nanowires were investigated using X-ray diffraction, transmission electron microscopy, and photoluminescence spectroscopy. The GaN nanowires grown on graphene films were transferred onto polymer substrates using a simple lift-off method for applications as flexible photocatalysts. Photocatalysis activities of the GaN nanowires prepared on the flexible polymer substrates were investigated under bending conditions.

Original languageEnglish
Pages (from-to)1437-1442
Number of pages6
JournalCurrent Applied Physics
Volume14
Issue number11
DOIs
Publication statusPublished - 2014 Jan 1

Keywords

  • GaN
  • Graphene
  • Nanowire
  • Photocatalyst

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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