Study on Fabrication of Novel Monolithic and Hybrid Materials by Combined Use of Newly Synthesized Ceramics Powders and Various Kinds of Sintering Methods

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  • HIROTA Ken
    Department of Molecular Chemistry & Biochemistry, Faculty of Science & Engineering, Doshisha University

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  • セラミックス粉体の合成と各種焼結法を組み合わせた新規モノリシック およびハイブリッド材料の作製に関する研究
  • 受賞記念講演 : 平成24年度研究功績賞 セラミックス粉体の合成と各種焼結法を組み合わせた新規モノリシックおよびハイブリッド材料の作製に関する研究
  • ジュショウ キネン コウエン : ヘイセイ 24ネンド ケンキュウ コウセキショウ セラミックス フンタイ ノ ゴウセイ ト カクシュ ショウケツホウ オ クミアワセタ シンキ モノリシック オヨビ ハイブリッド ザイリョウ ノ サクセイ ニ カンスル ケンキュウ

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Abstract

Bronze-type TiO2(B) single-crystal fibers with several microns in length and 300～400 nm in diameter, were synthesized from anatase TiO2 by the supercritical fluid hydrothermal treatment at c.a. 375～425 ˚C under 23～37 MPa in 10 mol • L−1 NaOH aq. followed by ion-exchange of Na to H in dilute HCl aq. and post-heating at 400 ˚C for 5 h in air. Thus prepared TiO2(B) fibers were characterized by XRD analysis, SEM/TEM observations, ED analysis, DTA/TG and BET surface area measurements. Electrical conductivity of the fibers was also evaluated using “Nano-probe” measurement system. Compared to the conventional TiO2(B) fibers prepared from the normal hydrothermal treatment at c.a.185 ˚C for 8 h, the present TiO2(B) showed higher thermal stability; TiO2(B) phase was stable even after heating at 800 ˚C for 1 h in air. And they show an extreme high electrical conductivities of 1.2 ～1.3 S • m−1; they were higher 1011 and 1.5 times than those of anatase TiO2 and conventional TiO2(B), respectively

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