Efficient proton conductivity of gas-tight nanomembranes of silica-based double oxides

Yoshitaka Aoki, Emi Muto, Aiko Nakao, Toyoki Kunitake

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


An experiment was conducted to report that protonic conduction is a common feature of amorphous films of many silica-based double oxides and that their sub-100-nm thick membranes can act as effective barriers against diffusion of H2 molecules. An aluminosilicate film of 100-nm thickness was prepared from a 100 mm mixed sol of AlCl3 and tetraethoxysilane (TEOS) with atomic ratio of Al/Si = 0.1/0.9 in ethanol. All of the metal alkoxides were used without further purification. Thin films of various metal silicates were prepared from mixed solutions of TEOS and individual metal alkoxides. Appropriate doses of TEOS were added to I-PrOH and then hydrochloric acid. The ITO substrate was treated with oxygen plasma at 10 W under 10 Pa for 10s and immersed in pure water, in order to produce a clean, hydrophilic surface of ITO. It was observed that amorphous nanomembranes contain sufficient acidic sites throughout the membrane interior and that the protons migrate through the membrane matrix.

Original languageEnglish
Pages (from-to)4387-4393
Number of pages7
JournalAdvanced Materials
Issue number23
Publication statusPublished - Dec 2 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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