Wu Kaidi, Luo Yifan, Li Ying, Zhang Chao
College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, P.R. China.
College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, P.R. China.
Beilstein J Nanotechnol. 2019 Dec 16;10:2516-2526. doi: 10.3762/bjnano.10.242. eCollection 2019.
Hollow spheres of pure ZnFeO and of composites of ZnFeO and reduced graphene oxide (rGO) with different rGO content were prepared via a simple solvothermal method followed by a high-temperature annealing process in an inert atmosphere. The X-ray diffraction analysis confirmed that the introduction of rGO had no effect on the spinel structure of ZnFeO. In addition, the results of field-emission scanning electron microscopy and (high-resolution) transmission electron microscopy indicated that the synthesized samples had the structure of hollow spheres distributed uniformly onto rGO nanosheets. The diameters of the spheres were determined as about 600-1000 nm. The gas sensing test revealed that the introduction of rGO improved the performance of the sensing of acetone to low concentration, and the ZnFeO/rGO composite gas sensor containing 0.5 wt % of rGO exhibited a high sensitivity in sensing test using 0.8-100 ppm acetone at 200 °C. The response of the 0.5 wt % ZnFeO/rGO sensor to 0.8 ppm acetone was 1.50, and its response to 10 ppm acetone was 8.18, which is around 2.6 times more pronounced than the response of pure ZnFeO (10 ppm, 3.20). Moreover, the sensor showed a wide linear range and good selectivity.
通过简单的溶剂热法，随后在惰性气氛中进行高温退火处理，制备了纯ZnFeO以及具有不同氧化石墨烯（rGO）含量的ZnFeO与还原氧化石墨烯（rGO）复合材料的空心球。X射线衍射分析证实，rGO的引入对ZnFeO的尖晶石结构没有影响。此外，场发射扫描电子显微镜和（高分辨率）透射电子显微镜的结果表明，合成的样品具有均匀分布在rGO纳米片上的空心球结构。球体的直径确定为约600 - 1000 nm。气敏测试表明，rGO的引入提高了对低浓度丙酮的传感性能，并且含有0.5 wt% rGO的ZnFeO/rGO复合气敏传感器在200°C下使用0.8 - 100 ppm丙酮的传感测试中表现出高灵敏度。0.5 wt% ZnFeO/rGO传感器对0.8 ppm丙酮的响应为1.50，对10 ppm丙酮的响应为8.18，这比纯ZnFeO（10 ppm，3.20）的响应大约明显2.6倍。此外，该传感器显示出宽线性范围和良好的选择性。
