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Directional Heat Dissipation across the Interface in Anatase-Rutile Nanocomposites

机译:锐钛型金红石型纳米复合材料界面上的定向散热

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摘要

Understanding the structures and properties of interfaces in (nano-) composites helps to reveal their important influence on reactivity and overall performance. TiO2 is a technologically important material, and anatase/rutile TiO2 composites have been shown to display enhanced photocatalytic performance over pure anatase or rutile TiO2. This has been attributed to a synergistic effect between the two phases, but the origin of this effect as well as the structure of the interface has not been established. Using Raman spectroscopy, here we provide evidence of distinct differences in the thermal properties of the anatase and rutile moieties in the composite, with anatase becoming effectively much warmer than the rutile phase under laser irradiation. With the help of first-principles calculations, we analyze the atomic structure and unique electronic properties of the composite and infer possible reasons for the directional heat dissipation across the interface.
机译:了解(纳米)复合材料界面的结构和性质有助于揭示它们对反应性和整体性能的重要影响。 TiO 2是技术上重要的材料,并且锐钛矿/金红石TiO 2复合材料已显示出比纯锐钛矿或金红石TiO 2增强的光催化性能。这归因于两个阶段之间的协同效应,但是这种效应的起源以及界面的结构尚未确定。使用拉曼光谱法,在这里我们提供了锐钛矿和金红石部分在复合物中热性质的明显差异的证据,在激光照射下,锐钛矿实际上比金红石相变热。借助第一性原理计算,我们分析了复合材料的原子结构和独特的电子性能,并推断出界面上定向散热的可能原因。

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