二维少层碳化钛/氧化锌复合材料的制备及其气敏性能研究

Fabrication of two-dimensional few-layer titanium carbide/zinc oxide composite and study on its gas sensitive property

通过水热法和化学选择性刻蚀法分别制备一维氧化锌(ZnO)纳米线和二维层状碳化钛(Ti_(3)C_(2)T_(x)),采用静电自组装和双向冷冻干燥技术得到超轻少层碳化钛/氧化锌(f-Ti_(3)C_(2)T_(x)/ZnO)复合材料,并利用XRD、SEM、TEM等对样品进行结构和形貌表征。将f-Ti_(3)C_(2)T_(x)/ZnO复合材料制成气敏元件,考察其气敏性能,并与纯Ti_(3)C_(2)T_(x)进行比较。结果表明,200℃下,Ti_(3)C_(2)T_(x)质量分数为14%的复合材料对100μL/L二氧化氮(NO_(2))的响应值(S=R_(g)/R_(a))达到30.31,相比纯Ti_(3)C_(2)T_(x)提高7.27倍。f-Ti_(3)C_(2)T_(x)/ZnO复合材料可用作检测NO_(2)气体的新型传感材料。

One-dimensional zinc oxide nanowire(ZnO)and two-dimensional layered titanium carbide(Ti_(3)C_(2)T_(x))are prepared by hydrothermal method and chemical etching method,respectively.Ultralight few-layer titanium carbide/zinc oxide composite(f-Ti_(3)C_(2)T_(x)/ZnO)is prepared via electrostatic self-assembly and bidirectional freeze-drying technologies.The structure and morphology of the samples are characterized by mean of XRD,SEM and TEM.The obtained f-Ti_(3)C_(2)T_(x)/ZnO composite is made into a gas sensor,and its gas-sensing properties are investigated and compared with pure Ti_(3)C_(2)T_(x).It is shown that the response value(S=R_(g)/R_(a))of the composite with a Ti_(3)C_(2)T_(x)mass fraction of 14%to a 100 ppm nitrogen dioxide reaches 30.31 at 200℃,which is 8.27 times that of pure Ti_(3)C_(2)T_(x).f-Ti_(3)C_(2)T_(x)/ZnO composite material can be used as a new sensing material for detecting NO2 gas.