Structural changes of TiO2 as a result of CNTs incorporation

A. Grozdanov, P. Paunović, P. Makreski, Iva Dimitrievska, A. Petrovski
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引用次数: 1

Abstract

The subject of this research work was to analyze the structural and morphological changes of TiO2 as a result of incorporation of CNTs and interpret the underlying principles for the observed interactions. Hybrid TiO2/CNTs nanostructures were prepared by simplified sol-gel method followed by monitoring the thermally-induced alterations occurring up to 400 ºC. The effects of different type of CNTs (activated MWCNTs and as prepared SWCNTs) as well as the variation of the content of MWCNTs in association with the metal-dopant (Pt or Co) influencing the structural parameters of TiO2 was monitored. Addition of CNTs and metallic phase causes reduction of TiO2 (anatase) crystallite size. The applied instrumental techniques such as XRPD, Raman spectroscopy and thermal (TG, DTA and DTG) analysis points out on achieved interaction between TiO2 and incorporated CNTs. Morphological changes, observed from the SEM micrographs, revealed better inter-locking of the TiO2 matrix with SWCNTs than with MWCNTs. Formation of a more structurally disordered and non-stoichiometric anatase phase seemed to be a preferred choice for the obtained TiO2-CNT-metalic phase nanocomposites for further utilization in sensor-design products.
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CNTs掺入后TiO2的结构变化
本研究工作的主题是分析CNTs掺入后TiO2的结构和形态变化,并解释所观察到的相互作用的基本原理。采用简化的溶胶-凝胶法制备了TiO2/CNTs杂化纳米结构,并监测了在高达400℃时发生的热致改变。研究了不同类型的CNTs(活化的MWCNTs和制备的SWCNTs)以及MWCNTs含量随金属掺杂剂(Pt或Co)的变化对TiO2结构参数的影响。CNTs和金属相的加入使TiO2(锐钛矿)晶粒尺寸减小。应用的仪器技术如XRPD、拉曼光谱和热分析(TG、DTA和DTG)指出了TiO2与掺入的CNTs之间实现的相互作用。从SEM显微图中观察到的形态变化表明,与MWCNTs相比,SWCNTs能更好地互锁TiO2基体。对于获得的二氧化钛-碳纳米管金属相纳米复合材料来说,形成结构更无序和非化学计量的锐钛矿相似乎是进一步应用于传感器设计产品的首选。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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