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Crystallization and high-temperature structural stability of titanium oxide nanotube arrays

机译：氧化钛纳米管阵列的晶化和高温结构稳定性

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The stability of titanium oxide nanotube arrays at elevated temperatures was studied in dry oxygen as well as dry and humid argon environments. The tubes crystallized in the anatase phase at a temperature of about 280℃ irrespective of the ambient. Anatase crystallites formed inside the tube walls and transformed completely to rutile at about 620℃ in dry environments and 570℃ in humid argon. No discernible changes in the dimensions of the tubes were found when the heat treatment was performed in oxygen. However, variations of 10% and 20% in average inner diameter and wall thickness, respectively, were observed when annealing in a dry argon atmosphere at 580℃ for 3 h. Pore shrinkage was even more pronounced in humid argon environments. In all cases the nanotube architecture was found to be stable up to approximately 580℃, above which oxidation and grain growth in the titanium support disrupted the overlying nanotube array.
机译：在干燥的氧气以及干燥和潮湿的氩气环境下研究了钛氧化物纳米管阵列在高温下的稳定性。不受环境影响，试管在约280℃的温度下以锐钛矿相结晶。锐钛矿晶体在管壁内形成，并在干燥环境下约620℃和潮湿氩气下570℃完全转变为金红石。当在氧气中进行热处理时，没有发现管子尺寸的明显变化。但是，在干燥氩气中于580℃退火3小时后，平均内径和壁厚分别出现了10％和20％的变化。在潮湿的氩气环境中，孔收缩甚至更为明显。在所有情况下，发现纳米管结构在大约580℃的温度下都是稳定的，超过此温度，钛载体中的氧化和晶粒生长会破坏上面的纳米管阵列。

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