A combined electrochemical route to fabricate large-area and free-standing inverse opaline film

Chen Hong Liao, Pei Sung Hung, Cheng Yeou Wu, Hsin Yi Chen, Pu-Wei Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A combined electrochemical route involving electrophoresis and electrodeposition is developed to fabricate a large-area unsupported nickel inverse opaline film with thickness less than 10 μm. A vertical electrophoresis allows for the packing of 495 nm polystyrene microspheres on an ITO-coated glass to form a colloidal crystal with significantly reduced defects. Subsequently, a nickel electrodeposition is employed to fill the interstitial voids among the close-packed polystyrene microspheres, followed by the removal of the colloidal template in a two-stage process, leaving a robust nickel skeleton with hexagonally arranged pores and interconnected pore channels. This nickel skeleton is then detached from the ITO-coated glass via a liquid nitrogen treatment, rendering a free-standing nickel inverse opaline film in 2 × 2 cm2. Porometer measurements indicate a narrow pore size distribution consistent with images from scanning electron microscope. We determine that the intensity ratio of (111)/(100) diffraction peak is an indicator for the strength of the Ni inverse opals, and thus affects its structural integrity upon detachment from the ITO-coated glass.

Original languageEnglish
Pages (from-to)32-35
Number of pages4
JournalElectrochemistry Communications
Volume68
DOIs
StatePublished - 1 Jul 2016

Keywords

  • Colloidal crystals
  • Electrodeposition
  • Electrophoresis
  • Inverse opals
  • Nickel

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