Synthesis of WO3 flower-like hierarchical architectures and their sensing properties

Authors：Meng Dan; Wang Guosheng; San Xiaoguang; Song Yinmin; Shen Yanbai; Zhang Yajing; Wang Kangjun; Meng Fanli

Source：2015, v 649.

DOI：10.1016/j.jallcom.2015.07.142

• Flower-like structures
• Hierarchical architectures
• Hydrothermal process
• Large specific surface areas
• Morphology and crystal structures
• Operating temperature
• Tungsten oxide
• X ray diffractometers

WO3 flower-like hierarchical architectures were synthesized by hydrothermal process using sodium tungstate (Na2WO4·2H2O) as tungsten source and citric acid (CA) as an assistant agent. The morphology and crystal structure were investigated using scanning electron microscope and X-ray diffractometer. It is found that CA played a significant role in governing morphologies of product during hydrothermal process. The obtained products were identified as triclinic crystal WO3 structure. The ethanol gas sensing measurements showed that well-defined WO3 flower-like structures synthesized at CA/W molar ratio of 1 with large specific surface area exhibited the higher responses compared with others at all operating temperatures. Moreover, the reversible and fast response to ethanol gas at various gas concentrations and good selectivity were obtained. The results indicated that the WO3 flower-like hierarchical architectures are promising materials for gas sensors.

• Institution
  东北大学