Sui Lili, Yu Tingting, Zhao Dan, Cheng Xiaoli, Zhang Xianfa, Wang Ping, Xu Yingming, Gao Shan, Zhao Hui, Gao Yuan, Huo Lihua
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, China; Heilongjiang Provincial Key Laboratory of Catalytic Synthesis for Fine Chemicals, School of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, 161006, China.
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, China.
J Hazard Mater. 2020 Mar 5;385:121570. doi: 10.1016/j.jhazmat.2019.121570. Epub 2019 Nov 8.
Hierarchical and heterogeneous CuO/NiO nanowall arrays were in situ grown on ceramic tubes via a facile template-free hydrothermal route, and then were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen adsorption-desorption techniques. The resultant composites exhibit network-like CuO/NiO array structures constructed by interconnected porous nanosheets, in which the decoration of CuO nanoparticles in NiO nanowall arrays was confirmed by XRD, XPS and TEM analyses. The 2.84 at % CuO decorated NiO sensor exhibits excellent sensing properties at 133 °C. The response to 5 ppm HS attains 36.9, which increases as high as 5.6 times compared to the NiO one. The detection limit to HS is further decreased from 1 ppb for the pure NiO sensor to 0.5 ppb. The CuO/NiO sensor shows a wide linear range from 50 to 1000 ppb, good repeatability, selectivity and long-term stability, which is expected to be a candidate for ppb-level HS detection in real and complex environment of industrial production. Furthermore, the dominant HS sensing mechanism is discussed from the view of the homo- and hierarchical architecture of the CuO/NiO arrays as well as the chemical and electronic sensitization effects of CuO decoration.
通过简便的无模板水热法在陶瓷管上原位生长出分层且异质的CuO/NiO纳米壁阵列，然后用X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和氮吸附-脱附技术对其进行表征。所得复合材料呈现出由相互连接的多孔纳米片构建的网络状CuO/NiO阵列结构，其中XRD、XPS和TEM分析证实了在NiO纳米壁阵列中CuO纳米颗粒的修饰。2.84原子百分比的CuO修饰的NiO传感器在133℃时表现出优异的传感性能。对5 ppm H₂S的响应达到36.9，与NiO传感器相比增加了高达5.6倍。对H₂S的检测限从纯NiO传感器的1 ppb进一步降低到0.5 ppb。CuO/NiO传感器显示出从50到1000 ppb的宽线性范围、良好的重复性、选择性和长期稳定性，有望成为工业生产实际复杂环境中ppb级H₂S检测的候选材料。此外，从CuO/NiO阵列的均相和分层结构以及CuO修饰的化学和电子敏化效应的角度讨论了主要的H₂S传感机制。
