Supercritical hydrothermal synthesis of carboxylic acid-surface- functionalized TiO2 nanocrystals: PH sensitive dispersion and hybridization with organic compounds

Toshihiko Arita; Ken Ichi Moriya; Kimitaka Minami; Takashi Naka; Tadafumi Adschiri

doi:10.1246/cl.2010.961

Supercritical hydrothermal synthesis of carboxylic acid-surface- functionalized TiO₂ nanocrystals: PH sensitive dispersion and hybridization with organic compounds

Toshihiko Arita, Ken Ichi Moriya, Kimitaka Minami, Takashi Naka, Tadafumi Adschiri

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Abstract

Surface-functionalized TiO₂ (anatase) nanocrystals (NCs) (avg. d=6.7±1.6nm) were synthesized by a supercritical hydrothermal method. A phosphonic acid derivative was used as surface modifier of TiO₂ NCs. It was verified that the phosphonic acids were bound to the surface of TiO ₂ with very strong binding energy. The TiO₂ NCs also exhibited extraordinarily high chemical stability. Such a strong binding between the phosphonic acid modifier and TiO₂ had not been obtained by any other methods. The TiO₂ NC showed sharp pH sensitive dispersion. Because of the functional as well as stable surface modifier layer, further manipulations on the surface using chemical reagents could be possible.

Original language	English
Pages (from-to)	961-963
Number of pages	3
Journal	Chemistry Letters
Volume	39
Issue number	9
DOIs	https://doi.org/10.1246/cl.2010.961
Publication status	Published - 2010

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abstract = "Surface-functionalized TiO2 (anatase) nanocrystals (NCs) (avg. d=6.7±1.6nm) were synthesized by a supercritical hydrothermal method. A phosphonic acid derivative was used as surface modifier of TiO2 NCs. It was verified that the phosphonic acids were bound to the surface of TiO 2 with very strong binding energy. The TiO2 NCs also exhibited extraordinarily high chemical stability. Such a strong binding between the phosphonic acid modifier and TiO2 had not been obtained by any other methods. The TiO2 NC showed sharp pH sensitive dispersion. Because of the functional as well as stable surface modifier layer, further manipulations on the surface using chemical reagents could be possible.",

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AU - Arita, Toshihiko

AU - Moriya, Ken Ichi

AU - Minami, Kimitaka

AU - Naka, Takashi

AU - Adschiri, Tadafumi

PY - 2010

Y1 - 2010

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AB - Surface-functionalized TiO2 (anatase) nanocrystals (NCs) (avg. d=6.7±1.6nm) were synthesized by a supercritical hydrothermal method. A phosphonic acid derivative was used as surface modifier of TiO2 NCs. It was verified that the phosphonic acids were bound to the surface of TiO 2 with very strong binding energy. The TiO2 NCs also exhibited extraordinarily high chemical stability. Such a strong binding between the phosphonic acid modifier and TiO2 had not been obtained by any other methods. The TiO2 NC showed sharp pH sensitive dispersion. Because of the functional as well as stable surface modifier layer, further manipulations on the surface using chemical reagents could be possible.

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Supercritical hydrothermal synthesis of carboxylic acid-surface- functionalized TiO₂ nanocrystals: PH sensitive dispersion and hybridization with organic compounds

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