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AssigneeToshiba Ceramics Co., Ltd.
InventorsZhonghua Zhou, Fumio Tokuoka, Yugo Ito, Tatsuya Ishii, Shunzo Shimai, Hiroshi Yamaguchi, Hiroyuki Kondo
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The invention provides titanium dioxide fine particles, wherein nitrogen and at least one element selected from carbon, hydrogen, sulfur doped in titanium dioxide by heat-treating fine particles of a material of titanium dioxide at 500° C. or more and 600° C. or less in a reducing gas atmosphere containing nitrogen. The titanium fine particles exhibit a high photocatalytic activity than in the conventional art by irradiating a visible light such that they exhibit an isopropanol oxidation activity induced by visible light irradiation with a wavelength of 400 nm or more and 600 nm or less with excellent stability and durability of the photocatalytic activity.
Titanium dioxide fine particles, wherein the titanium dioxide is doped with at least two elements selected from the group consisting of carbon, hydrogen, nitrogen and sulfur wherein a titanium dioxide content of the titanium dioxide fine particles is 80% by weight or more and wherein, if the titanium dioxide is doped with nitrogen, the nitrogen comprises 700 ppm by weight or more.
Titanium dioxide fine particles, wherein the titanium dioxide is doped with 700 ppm by weight or more of nitrogen and with at least one element selected from the group consisting of carbon, hydrogen and sulfur and wherein a titanium dioxide content of the titanium dioxide fine particles is 80% by weight or more.
Titanium dioxide fine particles, wherein the titanium dioxide is doped with carbon, hydrogen and 700 ppm by weight or more of nitrogen and wherein a titanium dioxide content of the titanium dioxide fine particles is 80% by weight or more.
Titanium dioxide fine particles, wherein the titanium dioxide is doped with two or more kinds of anions including at least carbon and nitrogen wherein the titanium dioxide is doped with at least 700 ppm by weight or more of nitrogen relative to titanium oxide and wherein of the titanium dioxide fine particles is 80% by weight or more and wherein a titanium dioxide content of the titanium dioxide fine particles is 80% by weight or more.
Titanium dioxide fine particles, wherein the titanium dioxide is doped with 700 ppm by weight or more to 10,000 ppm by weight or less of nitrogen anions and further doped with carbon anions in a concentration of 1/30 or more to ⅓ or less of the concentration of nitrogen are doped in titanium dioxide and wherein a titanium dioxide content of the titanium dioxide fine particles is 80% by weight or more.
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