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    National Tsing Hua University Institutional Repository > 研究中心 > 奈微與材料科技中心 > 期刊論文 >  Chimie Douce Route to Sodium Hydroxo Titanate Nanowires with Modulated Structure and Conversion to Highly Photoactive Titanium Dioxides


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/61623


    Title: Chimie Douce Route to Sodium Hydroxo Titanate Nanowires with Modulated Structure and Conversion to Highly Photoactive Titanium Dioxides
    Authors: Peng, Chih-Wei;Richard-Plouet, Mireille;Ke, Tsung-Yin;Lee, Chi-Young;Chiu, Hsin-Tien;Marhic, Christiane;Puzenat, Eric;Lemoigno, Frederic;Brohan, Luc
    教師: 李紫原
    Date: 2008
    Publisher: American Chemical Society
    Relation: CHEMISTRY OF MATERIALS,Volume: 20,Issue: 23,Pages: 7228-7236,Published: DEC 9 2008
    Keywords: ELECTRON-DIFFRACTION
    X-RAY
    TIO2
    NANOTUBES
    NANOFIBERS
    REACTIVITY
    Abstract: Sodium hydroxo titanate nanowires with NaTi2O4(OH) formulation are fabricated by chimie-douce from TiO2 powders in a hot concentrated base solution. In the present work, we investigate, in detail, the structure and morphology of the titanate, acid-exchanged materials, and phases formed during dehydration of these compounds; we then discuss the relationship between the initial titanate structure and TiO2 formation. XRD, ED, HRTEM, EDS, density measurements, and TG/MS results suggest that the titanate and acid-exchanged structures were closely related to the pseudolepidocrocite arrangement ("Cs2Ti6O12" type). The average structure of NaTi2O4(OH) nanowires consists of noncorrugated Ti2O3(OH) and NaO layers stacked along the [0 10] direction and an energy minimization was further conducted by theoretical methods. From TEM study, we demonstrated that NaTi2O4(OH) exhibits a modulated structure (q wave vector equals to 1/7 [001]*), which originates from the misfit between the NaO and Ti2O3(OH) sublattices. NaTi2O4(OH) structure has a monoclinic distortion (I2/m space group) with refined unit cell a = 0.37000(6) nm, b = 1.7816(4) nm, c = 2.2077(3) nm, beta = 92.70(1)degrees. Proton exchange followed by heat treatment convert the sodium hydroxo titanate into highly photoactive TiO2 nanowires. The activity is attributed to the presence of preferentially exposed (001) surface plane which is explained by the topotactic phase transformation of TiO2(B) into anatase.
    URI: http://pubs.acs.org/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/61623
    Appears in Collections:[奈微與材料科技中心] 期刊論文

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