Silica coating of synthesized Ta3N5 powders by the micro-emulsion method

Jae Hwan Pee, Jong Chul Park, Yoojin Kim, Woo Seok Cho, Hyung Ho Park

Research output: Contribution to journalConference article

Abstract

We synthesized yellow TaON and red Ta3N5 by ammonolysis of amorphous Ta(OH)5 between 800 and 1000 °C. Ta(OH)5 was prepared by titration, using TaCl5 as the starting material. Yellow TaON was synthesized at 900 °C for 2 h, and red Ta3N5 was synthesized at 1000 °C for 5 h. In general, red Ta3N5 powders were easily oxidized at 500 °C, with the color changing from red to white. To minimize the oxidation problem of Ta3N5 powders, we proposed a silica coating system using tetraethyl orthosilicate (TEOS) and 3-aminopropyltriethoxy-silane (APTES) as surfactants. The tonality of silica-coated Ta3N5 changes very little, indicating that the silica coating minimizes the oxidation of Ta3N5 nanoparticles.

Original languageEnglish
Article number014048
JournalPhysica Scripta T
VolumeT139
DOIs
Publication statusPublished - 2010 Jul 23

Fingerprint

Microemulsion
Silica
Powder
emulsions
Coating
silicon dioxide
coatings
Oxidation
ammonolysis
Minimise
tetraethyl orthosilicate
oxidation
Surfactant
silanes
titration
Nanoparticles
coating
surfactants
color
nanoparticles

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

Cite this

Pee, Jae Hwan ; Park, Jong Chul ; Kim, Yoojin ; Cho, Woo Seok ; Park, Hyung Ho. / Silica coating of synthesized Ta3N5 powders by the micro-emulsion method. In: Physica Scripta T. 2010 ; Vol. T139.
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abstract = "We synthesized yellow TaON and red Ta3N5 by ammonolysis of amorphous Ta(OH)5 between 800 and 1000 °C. Ta(OH)5 was prepared by titration, using TaCl5 as the starting material. Yellow TaON was synthesized at 900 °C for 2 h, and red Ta3N5 was synthesized at 1000 °C for 5 h. In general, red Ta3N5 powders were easily oxidized at 500 °C, with the color changing from red to white. To minimize the oxidation problem of Ta3N5 powders, we proposed a silica coating system using tetraethyl orthosilicate (TEOS) and 3-aminopropyltriethoxy-silane (APTES) as surfactants. The tonality of silica-coated Ta3N5 changes very little, indicating that the silica coating minimizes the oxidation of Ta3N5 nanoparticles.",
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Silica coating of synthesized Ta3N5 powders by the micro-emulsion method. / Pee, Jae Hwan; Park, Jong Chul; Kim, Yoojin; Cho, Woo Seok; Park, Hyung Ho.

In: Physica Scripta T, Vol. T139, 014048, 23.07.2010.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Silica coating of synthesized Ta3N5 powders by the micro-emulsion method

AU - Pee, Jae Hwan

AU - Park, Jong Chul

AU - Kim, Yoojin

AU - Cho, Woo Seok

AU - Park, Hyung Ho

PY - 2010/7/23

Y1 - 2010/7/23

N2 - We synthesized yellow TaON and red Ta3N5 by ammonolysis of amorphous Ta(OH)5 between 800 and 1000 °C. Ta(OH)5 was prepared by titration, using TaCl5 as the starting material. Yellow TaON was synthesized at 900 °C for 2 h, and red Ta3N5 was synthesized at 1000 °C for 5 h. In general, red Ta3N5 powders were easily oxidized at 500 °C, with the color changing from red to white. To minimize the oxidation problem of Ta3N5 powders, we proposed a silica coating system using tetraethyl orthosilicate (TEOS) and 3-aminopropyltriethoxy-silane (APTES) as surfactants. The tonality of silica-coated Ta3N5 changes very little, indicating that the silica coating minimizes the oxidation of Ta3N5 nanoparticles.

AB - We synthesized yellow TaON and red Ta3N5 by ammonolysis of amorphous Ta(OH)5 between 800 and 1000 °C. Ta(OH)5 was prepared by titration, using TaCl5 as the starting material. Yellow TaON was synthesized at 900 °C for 2 h, and red Ta3N5 was synthesized at 1000 °C for 5 h. In general, red Ta3N5 powders were easily oxidized at 500 °C, with the color changing from red to white. To minimize the oxidation problem of Ta3N5 powders, we proposed a silica coating system using tetraethyl orthosilicate (TEOS) and 3-aminopropyltriethoxy-silane (APTES) as surfactants. The tonality of silica-coated Ta3N5 changes very little, indicating that the silica coating minimizes the oxidation of Ta3N5 nanoparticles.

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