State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400030, China.
Sensors (Basel). 2013 May 10;13(5):6171-82. doi: 10.3390/s130506171.
Hierarchical flower-like ZnO nanorods, net-like ZnO nanofibers and ZnO nanobulks have been successfully synthesized via a surfactant assisted hydrothemal method. The synthesized products were characterized by X-ray powder diffraction and field emission scanning electron microscopy, respectively. A possible growth mechanism of the various hierarchical ZnO nanostructures is discussed in detail. Gas sensors based on the as-prepared ZnO nanostructures were fabricated by screen-printing on a flat ceramic substrate. Furthermore, their gas sensing characteristics towards methane were systematically investigated. Methane is an important characteristic hydrocarbon contaminant found dissolved in power transformer oil as a result of faults. We find that the hierarchical flower-like ZnO nanorods and net-like ZnO nanofibers samples show higher gas response and lower operating temperature with rapid response-recovery time compared to those of sensors based on ZnO nanobulks. These results present a feasible way of exploring high performance sensing materials for on-site detection of characteristic fault gases dissolved in transformer oil.
通过表面活性剂辅助水热法成功合成了分层花状 ZnO 纳米棒、网状 ZnO 纳米纤维和 ZnO 纳米块。分别采用 X 射线粉末衍射和场发射扫描电子显微镜对合成产物进行了表征。详细讨论了各种分层 ZnO 纳米结构的可能生长机制。通过在平面陶瓷衬底上丝网印刷制备了基于所制备的 ZnO 纳米结构的气体传感器。此外，还系统研究了它们对甲烷的气体传感特性。甲烷是一种重要的特征碳氢污染物，由于故障而溶解在电力变压器油中。我们发现，与基于 ZnO 纳米块的传感器相比，分层花状 ZnO 纳米棒和网状 ZnO 纳米纤维样品具有更高的气体响应和更低的工作温度，以及更快的响应-恢复时间。这些结果为探索用于现场检测溶解在变压器油中的特征故障气体的高性能传感材料提供了一种可行的方法。
