Electrodeposited 3D tungsten photonic crystals with enhanced thermal stability

Kevin A. Arpin, Mark D. Losego, Paul V. Braun

Research output: Contribution to journalArticlepeer-review

Abstract

Tungsten inverse opal photonic crystals were fabricated using a template directed electrodeposition method. The electrodeposition was accomplished using a molten salt solution at elevated temperatures. Following template removal, the tungsten inverse opals were conformally coated with hafnia or alumina via atomic layer deposition. This surface passivation layer increased the thermal stability of the tungsten microarchitectures by limiting surface diffusion. Alumina protected tungsten inverse opals were thermally stable up to 1000 °C for at least 12 h in forming gas (5% H2 in Ar). Hafnia protected inverse opals were thermally stable up to 1400 °C for at least 12 h in forming gas. We expect that this surface passivation technique can also be implemented to increase the thermal stability of other refractory metal microarchitectures. The demonstrated thermal stability is an important property for the realization of metallic photonic crystals as narrow band emitters for thermophotovoltaics.

Original languageEnglish (US)
Pages (from-to)4783-4788
Number of pages6
JournalChemistry of Materials
Volume23
Issue number21
DOIs
StatePublished - Nov 8 2011

Keywords

  • electrodeposition
  • Thermophotovoltaics
  • tungsten inverse opal

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

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