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Fabrication of Nanosized Island-Like CdO Crystallites-Decorated TiO2 Rod Nanocomposites via a Combinational Methodology and Their Low-Concentration NO2 Gas-Sensing Behavior

机译:纳米方法制备的岛状CdO微晶修饰的TiO2棒纳米复合材料及其低浓度NO2气敏特性

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摘要

TiO2–CdO composite rods were synthesized through a hydrothermal method and sputtering thin-film deposition. The hydrothermally derived TiO2 rods exhibited a rectangular cross-sectional crystal feature with a smooth surface, and the as-synthesized CdO thin film exhibited a rounded granular surface feature. Structural analyses revealed that the CdO thin film sputtered onto the surfaces of the TiO2 rods formed a discontinuous shell layer comprising many island-like CdO crystallites. The TiO2–CdO composite rods were highly crystalline, and their surfaces were rugged. A comparison of the NO2 gas-sensing properties of the CdO thin film, TiO2 rods, and TiO2–CdO composite rods revealed that the composite rods exhibited superior gas-sensing responses to NO2 gas than did the CdO thin film and TiO2 rods, which can be attributed to the microstructural differences and the formation of heterojunctions between the TiO2 core and CdO crystallites.
机译:通过水热法和溅射薄膜沉积法合成了TiO2-CdO复合棒。水热衍生的TiO2棒表现出具有光滑表面的矩形横截面晶体特征,并且合成后的CdO薄膜表现出圆形的颗粒表面特征。结构分析表明,溅射到TiO2棒表面的CdO薄膜形成了一个不连续的壳层,该壳层包含许多岛状CdO晶体。 TiO2-CdO复合棒是高度结晶的,并且表面粗糙。通过比较CdO薄膜,TiO2棒和TiO2-CdO复合棒的NO2气敏特性,发现该复合棒对NO2气体表现出比CdO薄膜和TiO2棒更好的气敏响应。这归因于TiO2核心与CdO晶体之间的微观结构差异和异质结的形成。

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