Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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A Facile Method for the Synthesis of Freestanding CuO Nanoleaf and Nanowire Films

  • 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 : 2018.09.18
  • Accepted : 2018.11.07
  • Published : 2018.12.31
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Abstract

A facile method to fabricate freestanding CuO nanoleaves and CuO nanowires-based films was demonstrated. $Cu(OH)_2$ nanoleaves and nanowires were prepared by a hydrolysis reaction in aqueous solution including pyridine and NaOH with the tailored concentrations at room temperature. The films of freestanding CuO nanoleaves and CuO nanowires can be successfully obtained via the simple vacuum infiltration following a thermal dehydration reaction. The morphologies and crystallinity of the $Cu(OH)_2$ nanoleaves/nanowires and CuO nanoleaves/nanowires were characterized by XRD, SEM, TEM and FT-IR. The films fabricated with freestanding CuO nanoleaves and nanowires in this study may be applicable for building high-efficiency organic binder-free devices, such as gas sensors, batteries, photoelectrodes for water splitting and so on.

Keywords

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Fig. 1 FT-IR spectra of (a) pyridine, (b) Cu(OH)2, and (c) CuO.

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Fig. 2 XRD patterns of the synthesized pristine Cu(OH)2 and CuO after calcination based on the standard XRD JCPDS 13-0420 and 48-1548 for Cu(OH)2 and CuO, respectively.

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Fig. 3 SEM images of (a) pristine Cu(OH)2 NL film after vacuum infiltration, (b) (c) CuO NL film after calcination, (d) pristine Cu(OH)2 NW film after vacuum infiltration, (e) (f) CuO NW film after calcination.

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Fig. 4 TEM images of CuO nanoleaves: (a) Low magnification, (b) high magnification, (inset of (a) is the selected area electron diffraction (SAED) pattern), and CuO nanowires: (c) Low magnification, (d) high magnification. (The scale bars are: (a)100 nm, (b) 2 nm, (c) 100 nm, and (d) 2 nm)

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Fig. 5 The digital photo of pristine Cu(OH)2 film after vacuum infiltration (left) and CuO film after calcination (right).

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