ZnO纳米棒阵列/QCM超疏水空间污染气敏传感器性能研究

空间环境污染监测中，石英晶体微天平（QCM）传感器可通过增加比表面积增强对有机污染分子的吸附能力，通过表面超疏水化减小水分子的影响，从而提高传感器的探测精度。文章采用水热法在QCM表面制备 ZnO纳米棒阵列膜，并对其形貌和物化性能进行实验测试。研究结果表明:ZnO纳米棒的顶端呈六边形，属于六方纤锌矿结构；ZnO纳米棒沿(002)晶面择优生长，具有较低的表面自由能；纳米棒之间存在空隙，表面接触角可达150°，表现出超疏水性能；ZnO纳米棒阵列增加了有机分子的吸附位点，使石英晶振吸附有机分子的能力更强；同时，ZnO纳米棒阵列具有一定的光催化性能，140 min内光催化降解罗丹明B的效率约为35.5%。以上研究工作可为空间环境有机分子污染监测提供技术参考。

Investigation of ZnO nanorod array/QCM superhydrophobic sensor used for gaseous space pollution monitoring

In the pollution detection and monitoring, the quartz crystal microbalance (QCM) may be expected to show better capability of adsorbing the organic molecular pollutant by increasing the specific surface area and to have a better precision by reducing the influence of the water molecules through the surface super-hydrophobicity handling. In this paper, the ZnO nanorod array films are prepared on the surface of a quartz crystal microbalance by the hydrothermal method, and the morphology as well as the physicial & chemical properties are tested experimentally. It is shown that the tip of the ZnO nanorods is in a hexagonal shape and of the hexagonal wurtzite structure. The ZnO nanorods grow along the crystal plane(002), of a lower surface free energy. There are interstices between the nanorods. The surface of the ZnO nanorod array/QCM shows superhydrophobic properties, and the contact angle of the nanorods is as large as 150°, allowing more adsorption sites of acetone organic molecules in the ZnO nanorods array, thus the adsorption ability of the quartz crystal is enhanced. Meanwhile, the ZnO nanorod array/QCM has certain photocatalytic performance, and the photocatalytic degradation efficiency of Rhodamine B is about 35.5% within 140 min. This paper provides some technical support for the organic molecular pollution monitoring in the space environments.