Electrical and VOC sensing properties of anatase and rutile TiO2 nanotubes
Electrical and VOC sensing properties of anatase and rutile TiO2 nanotubes
复制标题
DOI：
10.1016/j.jallcom.2014.07.097
复制
发表时间：
2014-12
影响因子：
6.2
通讯作者：
E. Şennik;N. Kilinç;Z. Öztürk
中科院分区：
文献类型：
--
作者：
E. Şennik;N. Kilinç;Z. Öztürk
研究了金红石相和金红石相TiO 2纳米管的直流电和挥发性有机物（VOC）传感性能。在HF水溶液（0.5wt.%）中获得了TiO 2纳米管阵列。电解质的阳极氧化钛薄膜沉积在石英基板上使用热蒸发。在0 °C下在HF水溶液中以10 V进行阳极化。然后将制备的TiO 2纳米管在300 °C和700 °C干燥空气中退火5 h，分别得到金红石相和金红石相。采用X射线衍射（XRD）、扫描电子显微镜（SEM）和紫外可见分光光度计对TiO 2纳米管进行了表征。在干燥空气中的电流-电压特性表明，样品的电导率与金红石相的样品相比，金红石相的样品更高。在200 °C下研究了纳米管的VOC传感性能。结果发现，金红石型的传感器响应高于几乎所有的VOC气体的金红石型。另一方面，两个传感器的灵敏度是最高的异丙醇。
The dc electrical and volatile organic compound (VOC) sensing properties of TiO2nanotubes in both anatase and rutile phases were investigated. TiO2nanotube arrays were obtained in aqueous HF (0.5 wt.%) electrolytes by anodizing of Ti thin films that deposited on quartz substrates using thermal evaporation. Anodization was performed at 10 V in aqueous HF at 0 °C. Then the fabricated TiO2nanotubes were annealed at 300 °C and at 700 °C under dry air for 5 h to obtain anatase and rutile phases, respectively. The TiO2nanotubes were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) as structural, and UV–vis spectrophotometer as optical. The current voltage characteristics of the nanotubes under dry air flow revealed that the conductivity of the sample with anatase phase was higher than that of the sample with rutile phase. The VOCs sensing properties of the nanotubes were investigated at 200 °C. It was found that the sensor response of anatase was higher than that of rutile for almost all VOC gases. On the other hand, the sensitivities of two sensors are the highest for isopropyl alcohol.