Modification of carbon nanotube surfaces with precious metal and transition metal oxide nanoparticles using thin silica layers

Sakae Takenaka, Daisuke Mikami, Eishi Tanabe, Hideki Matsune, Masahiro Kishida

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The surfaces of carbon nanotubes (CNTs) were covered with thin silica layers through the application of 3-aminopropyltriethoxysilane (APTES) in order to enhance the deposition of precious metal and transition metal oxide nanoparticles. Pt metal particles smaller than 2 nm in diameter could be deposited, using a conventional impregnation method, on CNTs coated with silica layers, whereas Pt particles supported on bare CNT surfaces were approximately 3 nm in diameter. Thus, coating CNTs with thin silica layers enhanced the catalytic activity of the Pt catalysts. In addition, CNTs with thin silica layers could be uniformly covered with transition metal oxide layers (ZrO2, Nb2O5 and Ta2O5) by hydrolysis of the corresponding metal alkoxides. In contrast, metal oxides were very difficult to deposit on bare CNTs. The thin silica layers produced on the CNTs via the use of APTES evidently function as adsorption sites for precursor metals and metal oxides, as well as nucleation sites for metals and metal oxides, allowing the formation of precious metal-CNT and transition metal oxide-CNT composites.

Original languageEnglish
Pages (from-to)60-67
Number of pages8
JournalApplied Catalysis A: General
Volume492
DOIs
Publication statusPublished - Feb 25 2015

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Carbon Nanotubes
Precious metals
Silicon Dioxide
Oxides
Transition metals
Carbon nanotubes
Silica
Nanoparticles
Metals
Impregnation
Hydrolysis
Catalyst activity
Nucleation
Deposits
Adsorption
Coatings
Catalysts

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

Cite this

Modification of carbon nanotube surfaces with precious metal and transition metal oxide nanoparticles using thin silica layers. / Takenaka, Sakae; Mikami, Daisuke; Tanabe, Eishi; Matsune, Hideki; Kishida, Masahiro.

In: Applied Catalysis A: General, Vol. 492, 25.02.2015, p. 60-67.

Research output: Contribution to journalArticle

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AB - The surfaces of carbon nanotubes (CNTs) were covered with thin silica layers through the application of 3-aminopropyltriethoxysilane (APTES) in order to enhance the deposition of precious metal and transition metal oxide nanoparticles. Pt metal particles smaller than 2 nm in diameter could be deposited, using a conventional impregnation method, on CNTs coated with silica layers, whereas Pt particles supported on bare CNT surfaces were approximately 3 nm in diameter. Thus, coating CNTs with thin silica layers enhanced the catalytic activity of the Pt catalysts. In addition, CNTs with thin silica layers could be uniformly covered with transition metal oxide layers (ZrO2, Nb2O5 and Ta2O5) by hydrolysis of the corresponding metal alkoxides. In contrast, metal oxides were very difficult to deposit on bare CNTs. The thin silica layers produced on the CNTs via the use of APTES evidently function as adsorption sites for precursor metals and metal oxides, as well as nucleation sites for metals and metal oxides, allowing the formation of precious metal-CNT and transition metal oxide-CNT composites.

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