Room temperature gas sensing under UV light irradiation for Ti3C2Tx MXene derived lamellar TiO2-C/g-C3N4 composites
Room temperature gas sensing under UV light irradiation for Ti3C2Tx MXene derived lamellar TiO2-C/g-C3N4 composites
复制标题
Ti3C2TX MXene 衍生层状 TiO2-C/g-C3N4 复合材料在紫外光照射下的室温气体传感
DOI：
10.1016/j.apsusc.2020.147666
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发表时间：
2021-01-01
影响因子：
6.7
通讯作者：
Li, Yongxiang
中科院分区：
文献类型：
--
作者：
Hou, Ming;Gao, Jiyun;Li, Yongxiang
以LiF和盐酸为原料制备了二维层状结构的Ti 3C 2 Tx MXene。以三聚氰胺和Ti 3C 2 Tx为前驱体，采用原位生长法制备了TiO 2-C/g-C3 N4（TC-CN）复合材料。采用SEM、XRD、FT-IR等测试手段对样品的结构进行了表征。TC-CN的SEM图像显示其具有MXene类层状结构。研究了室温下紫外光照射下TC-CN对不同挥发性有机物气体的气敏性能。气敏结果表明，TC-CN在室温下，在紫外光照射下，对91至10 ppm的乙醇显示出优异的响应值。这种优异的气敏性能是由于紫外光照射、复合材料中能级位错的形成以及层状结构的形成，导致了光电子的增强，减少了光电子与空穴的复合，以及电子在TC-CN异质结中的高输运，从而增强了电子与氧的结合。进一步提出并讨论了该材料可能的气敏机理。
Two-dimensional layered-structured Ti3C2Tx MXene was prepared with hydrochloric acid and LiF. TiO2-C/g-C3N4 (TC-CN) composites were prepared by in situ growth method using melamine and Ti3C2Tx as a precursor. The structural properties of the as-prepared samples were characterized using SEM, XRD, and FT-IR measurements. The SEM image of TC-CN shows that it possesses an MXene-like lamellar structure. The gas sensing performances of TC-CN toward different volatile organic compounds gases at room temperature under UV light irradiation were investigated. The gas sensing results revealed that TC-CN showed excellent response value for 91 to 10 ppm ethanol at room temperature under UV light irradiation. The excellent gas sensing performances can be attributed to the UV light irradiation, construction of energy level dislocation, and lamellar structure of the composites, which leads to the enhancement of photoelectrons, reduction of the recombination of photoelectrons and holes, and high transportation of electrons in the TC-CN heterojunction, consequently enhancing the combination of the electrons and oxygen. Further, the possible gas sensing mechanism of the material was proposed and discussed.