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The fabrication of CNTs/TiO_2 photoanodes for sensitive determination of organic compounds

机译：用于灵敏测定有机化合物的CNTs / TiO_2光阳极的制备

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Titanium dioxide (TiO_2) and carbon nanotubes (CNTs) are the two most popular functional materials in recent years. In this study, CNTs/TiO _2 composite and TiO_2 photoanodes were fabricated by a dip-coating technique, followed by subsequent calcination. The resultant photoanodes were characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD), and UV-visible spectroscopy (UV-vis). The results suggest that the carbon nanotubes were successfully incorporated with the TiO _2 nanoparticulates without damage and that the resultant TiO _2 nanoparticles consisted of anatase and rutile. The CNTs/TiO _2 photoanodes were capable of oxidizing various types of organic compounds (e.g. glucose, potassium hydrogen phthalate, and phenol) in aqueous solutions in a photoelectrochemical bulk cell. In comparison with the pure TiO_2 photoanode, the sensitivity of the photoanode for the detection of organic compounds has been improved by 64%, while the background current was reduced by 80% due to the introduction of the CNTs. These advantages can be ascribed to the improved adsorptivity to organic compounds, increased absorption of UV light and enhanced electron transport at the CNTs/TiO_2 photoanode due to the introduction of the CNTs.
机译：二氧化钛（TiO_2）和碳纳米管（CNT）是近年来最流行的两种功能材料。在这项研究中，通过浸涂技术制备了CNTs / TiO _2复合材料和TiO_2光阳极，随后进行了煅烧。通过扫描电子显微镜（SEM），X射线衍射（XRD）和紫外可见光谱（UV-vis）对所得的光阳极进行表征。结果表明，碳纳米管成功地掺入了TiO _2纳米颗粒而没有受到破坏，并且所得的TiO _2纳米颗粒由锐钛矿和金红石组成。 CNT / TiO _2光阳极能够在光电化学大电池中氧化水溶液中的各种类型的有机化合物（例如葡萄糖，邻苯二甲酸氢钾和苯酚）。与纯TiO_2光电阳极相比，光电阳极对有机化合物的检测灵敏度提高了64％，而由于引入了CNT，背景电流降低了80％。这些优点可以归因于由于引入了CNT而提高了对有机化合物的吸附性，增加了对UV光的吸收并增强了在CNT / TiO_2光电阳极处的电子传输。

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