通过软化学转变制备出形态类似“狗尾草”的二氧化钛纳米纤维。

TiO2 nanofibers resembling 'yellow bristle grass' in morphology by a soft chemical transformation.

作者信息

Nandan Sandeep, Deepak T G, Nair Shantikumar V, Nair A Sreekumaran

机构信息

Amrita Centre for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences, Amrita Vishwa Vidyapeetham, AIMS PO, Kochi 682041, Kerala, India.

出版信息

Dalton Trans. 2015 May 28;44(20):9637-45. doi: 10.1039/c5dt01027f.

DOI:10.1039/c5dt01027f

PMID:25923133

Abstract

We synthesized a uniquely shaped one-dimensional (1-D) TiO2 nanostructure having the morphology of yellow bristle grass with high surface area by the titanate route under mild reaction conditions. The electrospun TiO2-SiO2 composite nanofibers upon treatment with concentrated NaOH at 80 °C under ambient pressure for 24 h resulted in sodium titanate (Na2Ti3O7) nanostructures. The Na2Ti3O7 nanostructures have an overall 1-D fibrous morphology but the highly porous fiber surfaces were decorated with layered thorn-like features (a morphology resembling that of yellow bristle grass) resulting in high surface area (113 m(2) g(-1)) and porosity. The Na2Ti3O7 nanostructures were converted into TiO2 nanostructures of the same morphology by acidification (0.1 N HCl) followed by low temperature sintering (110 °C) processes. Dye-sensitized solar cells (DSCs) constructed out of the material (cells of area 0.20 cm(2) and thickness 12 μm) showed a power conversion efficiency (η) of 8.02% in comparison with commercial P-25 TiO2 (η = 6.1%).

摘要

我们通过钛酸盐路线在温和的反应条件下合成了一种独特形状的一维（1-D）TiO₂纳米结构，其形态类似黄狗尾草，具有高表面积。在常压下于80°C用浓NaOH处理24小时后，电纺TiO₂-SiO₂复合纳米纤维生成了钛酸钠（Na₂Ti₃O₇）纳米结构。Na₂Ti₃O₇纳米结构整体呈一维纤维形态，但高度多孔的纤维表面装饰有层状刺状特征（一种类似黄狗尾草的形态），从而具有高表面积（113 m² g⁻¹）和孔隙率。通过酸化（0.1 N HCl）随后低温烧结（110°C）过程，Na₂Ti₃O₇纳米结构被转化为相同形态的TiO₂纳米结构。用该材料构建的染料敏化太阳能电池（DSC，面积为0.20 cm²，厚度为12μm）的功率转换效率（η）为8.02%，相比之下，商用P-25 TiO₂的功率转换效率为6.1%。