Ghayah M. Alsulaim, Shada A. Alsharif, Kholoud M. Alnahdi, Hanan A. Althikrallah
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引用次数: 0
摘要
氧化锌基纳米复合材料在储能系统和挥发性有机化合物检测方面引起了广泛关注。本研究通过共沉淀法制备了纯 MnO2-ZnO 复合材料和掺杂 Ce 的 MnO2-ZnO 复合材料。X 射线衍射结果验证了四方 MnO2 和六方 ZnO 相的形成。纯 MnO2-ZnO 复合材料和掺杂 Ce 的 MnO2-ZnO 复合材料的扫描电子显微镜图像显示形成了棒状和半球状颗粒。纯 MnO2-ZnO 复合材料和掺杂 Ce 的 MnO2-ZnO 复合材料在 45 Hz 频率下的半稳定巨介电常数值分别为 2.12 × 105 和 1.36 × 105,适合电容式储能应用。气体传感测量表明,掺杂 Ce 的 MnO2-ZnO 复合材料在 240 °C 的工作温度下对 100 ppm 丙酮气体具有高灵敏度,而在 180 °C 的工作温度下对 100 ppm 乙醇具有高灵敏度。因此,通过调节工作温度,可以控制掺杂 Ce 的 MnO2-ZnO 传感器对丙酮和乙醇气体的选择性。此外,这种传感器还具有良好的选择性和稳定性,其灵敏度与丙酮和乙醇气体的浓度呈适当的线性关系。
Pure and Ce-Doped MnO2–ZnO Nanocomposites for Colossal Dielectric Energy Storage and Gas Sensing Applications
ZnO-based nanocomposites have attracted a great attention for energy storage systems and detection of volatile organic compounds. In this study, pure and Ce-doped MnO2–ZnO composites were fabricated through a co-precipitation method. The results of X-ray diffraction verified the formation of tetragonal MnO2 and hexagonal ZnO phases. Scanning electron microscope images of pure and Ce-doped MnO2–ZnO composites displayed the formation of rods and semi-spherical particles. The pure and Ce-doped MnO2–ZnO composites exhibited semi-stable colossal dielectric constant values of 2.12 × 105 and 1.36 × 105, respectively, at a frequency of 45 Hz, which are proper for capacitive energy storage applications. Gas sensing measurements demonstrated that Ce-doped MnO2–ZnO composite has a high sensitivity toward 100 ppm acetone gas at operating temperature of 240 °C, while for 100 ppm ethanol this sensor has a high sensitivity at 180 °C. As a result, through adjusting the operating temperature, the selectivity of Ce-doped MnO2–ZnO sensor can be controlled for acetone and ethanol gases. Furthermore, this sensor possesses good selectivity and stability as well as proper linear relations between the sensitivity and concentrations of acetone and ethanol gases.
期刊介绍:
King Fahd University of Petroleum & Minerals (KFUPM) partnered with Springer to publish the Arabian Journal for Science and Engineering (AJSE).
AJSE, which has been published by KFUPM since 1975, is a recognized national, regional and international journal that provides a great opportunity for the dissemination of research advances from the Kingdom of Saudi Arabia, MENA and the world.