Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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3D Hierarchical Heterostructure of TiO2 Nanorod/Carbon Layer/NiMn-Layered Double Hydroxide Nanosheet

  • Zhao, Wei (Electronic Convergence Materials Division, Nano Convergence Materials Center, Korea Institute of Ceramic Engineering & Technology (KICET)) ;
  • Jung, Hyunsung (Electronic Convergence Materials Division, Nano Convergence Materials Center, Korea Institute of Ceramic Engineering & Technology (KICET))
  • Received : 2018.10.02
  • Accepted : 2018.12.10
  • Published : 2018.12.31
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Abstract

1D core-shell nanostructures have attracted great attention due to their enhanced physical and chemical properties. Specifically, oriented single-crystalline $TiO_2$ nanorods or nanowires on a transparent conductive substrate would be more desirable as the building core backbone. However, a facile approach to produce such structure-based hybrids is highly demanded. In this study, a three-step hydrothermal method was developed to grow NiMn-layered double hydroxide-decorated $TiO_2$/carbon core-shell nanorod arrays on transparent conductive fluorine-doped tin oxide (FTO) substrates. XRD, SEM, TEM, XPS and Raman were used to analyze the obtained samples. The in-situ fabricated hybrid nanostructured materials are expected to be applicable for photoelectrode working in water splitting.

Keywords

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Fig. 1 Schematic illustration for the fabrication of TiO2/C/NiMn-LDH core-double-shell NRAs.

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Fig. 2 SEM images of (a) TiO2 NRAs, (b) TiO2/C core-shell NRAs. (inset: (I) side view, and (II) enlarged top view of TiO2 NRAs. The scale bars for (a), (b) and the insets are 10 μm, 10 μm, 5 μm, and 1 μm, respectively).

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Fig. 3 XRD patterns of TiO2 NRAs, and carbon-coated TiO2 NRAs.

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Fig. 4 TEM and HR-TEM images of (a, b) TiO2 NRs, and (d, e) TiO2/C core-shell NRs, (c) line profile plots for circled area (I) and (II) in Fig. 4(b), (f) the HAAD-STEM image and elemental mapping image of an individual NR of a TiO2/C NR.

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Fig. 6 SEM images of (a) NiMn-LDH-decorated TiO2 NR arrays, and (b) NiMn-LDH-decorated TiO2/C core-shell NR arrays on FTO glass. (insets: enlarged view; the scale bars for (a), (b) and their insets are 1 μm, 1 μm, 100 nm, and 100 nm, respectively)

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Fig. 7 XRD patterns of NiMn-LDH nanosheetsdecorated TiO2 NRAs and TiO2/C core-shell NRAs.

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Fig. 5 (a) XPS spectra and (b) Raman spectra of the obtained TiO2 NRAs and TiO2/C core-shell NRAs.

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