FTIR study on the formation of TiO2 nanostructures in supercritical CO2

被引：88

作者：

Sui, Ruohong

Rizkalla, Amin S.

Charpentier, Paul A. ^{[1
]}

机构：

[1] Univ Western Ontario, Fac Engn, Dept Chem & Biochem Engn, London, ON N6A 5B9, Canada

[2] Univ Western Ontario, Schulich Sch Med & Dent, London, ON N6A 5B9, Canada

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2006年 / 110卷 / 33期

关键词：

D O I：

10.1021/jp0570521

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

TiO2 nanospherical and fibered structures were obtained via a one-step sol-gel method in supercritical carbon dioxide (scCO(2)) involving polycondensation of the alkoxide monomers titanium isopropoxide (TIP) and titanium butoxide (TBO) with acetic acid (HAc). The resulting materials were characterized by means of electron microscopy (SEM and TEM), X-ray diffraction (XRD), thermal analysis (TGA), and attenuated total reflection Fourier transmission infrared (ATR-FTIR) analysis. Depending on the experimental conditions, TiO2 anatase nanospheres with a diameter of 20 nm or TiO2 anatase/rutile nanofibers with a diameter of 10-100 nm were obtained. Fiber formation was enhanced by a higher HAc/Ti ratio and the use of the titanium isopropoxide (TIP) monomer. The mechanism of the microstructure formation was studied using in situ FTIR analysis in scCO(2). The FTIR results indicated that the formation of nanofibers was favored by a titanium hexamer that leads to one-dimensional condensation, while nanospheres were favored by a hexamer that permits three-dimensional condensation.

引用

页码：16212 / 16218

页数：7

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[11] SYNTHESIS AND SOLID-STATE AND LIQUID-STATE CHARACTERIZATION OF A HEXAMERIC CLUSTER OF TITANIUM(IV) - TI6(MU-2-O)2(MU-3-O)2(MU-2-OC4H9)2(OC4H9)6(OCOCH3)8 [J].