Evolution of pores in mesoporous silica films: Porogen loading effect

Chunqing He, Toshitaka Oka, Yoshinori Kobayashi, Nagayasu Oshima, Toshiyuki Ohdaira, Atsushi Kinomura, Ryoichi Suzuki

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Mesoporous silica films were synthesized via a sol-gel process under an acidic condition. Various amounts of triblock copolymer F38 were loaded to precursor sols as the pore generator. The evolution of the pores generated by porogen decomposition was investigated as a function of F38 loading by positron annihilation gamma-ray energy spectroscopy and positron annihilation lifetime spectroscopy based on slow positron beams. The threshold of pore percolation is found to be around 10 wt% of F38 loading by positron annihilation gamma-ray energy spectroscopy. Positron annihilation lifetime spectroscopy in the films show that the pore size increases from 1 nm to 3 nm with increasing F38 loading from 5 wt% to 30 wt%.

Original languageEnglish
Pages (from-to)183-186
Number of pages4
JournalApplied Surface Science
Volume255
Issue number1
DOIs
Publication statusPublished - 2008 Oct 31
Externally publishedYes

Keywords

  • Gamma-ray energy spectroscopy
  • Lifetime
  • Porogen
  • Positronium
  • Thin film

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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