石墨烯掺杂纳米氧化锌用于检测三乙胺的增强气敏性能

通过简单研磨实现固相反应的方法制备了纳米氧化锌材料,并利用石墨烯掺杂对氧化锌进行改性,研究了氧化锌材料的气敏性能。利用X射线衍射仪(XRD)、扫描电镜(SEM)、红外光谱仪(IR)对合成的样品进行了结构和形貌表征,考察了原料比例和石墨烯掺杂量对氧化锌形貌和气敏性能的影响。结果表明:合成的氧化锌均为纳米颗粒,随着柠檬酸量增加,得到许多有气孔的氧化锌;石墨烯掺杂后,均得到纳米颗粒的氧化锌;气体检测表明,石墨烯掺杂后的氧化锌,其最佳工作温度由400℃降为280℃,对三乙胺表现出较高的选择性;掺杂3%石墨烯的氧化锌对浓度为0.1 mmol/L三乙胺的响应值(S=Ra/Rg)达到18,是掺杂前的4倍。石墨烯掺杂纳米ZnO可作为检测三乙胺气体的新型传感材料。

Graphene-doped ZnO for detection of triethylamine and its enhanced sensing properties

Zinc oxide nanomaterials were prepared by simple grinding-assisted solid-state reaction,and modified by graphene doping.The gas sensing properties of zinc oxide were studied.The structure and morphology of the synthesized samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and infrared spectroscopy(IR),and the effects of raw material ratios and graphene doping on the morphology and gas sensing of zinc oxide were investigated.The results showed that the synthesized zinc oxide is composed of nanoparticles,and with the increasing citric acid content,zinc oxide with holes were obtained.Zinc oxide nanoparticles were obtained after doping with graphene.The results of gas detection showed that the optimum working temperature of graphene-doped zinc oxide decreased from 400℃to 280℃,and the prepared zinc exide has the high selectivity to triethylamine.The response of zinc oxide doped with 3%graphene to triethylamine(0.1 mmol/L)reached 18,which was four times of that before doping.It can be concluded that graphene doped nano-ZnO can be used as a new sensing material for the detection of triethylamine gas.