CNT-WO3元件的氨敏性能研究

以碳纳米管（CNT）为掺杂剂制成CNT—WO3旁热式气敏元件．采用混酸氧化法对碳纳米管进行纯化，化学沉淀法制备了纳米WO3微粉，并用TEM、FT—IR、TG—DSC、XRD等方法进行了表征．测试了元件在室温条件下对NH3的气敏性能．结果表明，碳纳米管掺杂元件在室温下对NH3的灵敏度远远高于纯WO3元件，其中0．8wt％的掺杂元件对NH3具有最高的灵敏度．另外，掺杂元件还具有检测浓度低、检测范围宽、选择性好等优点，是一种较为理想的氨敏元件．

NH3 Sensing Properties of CNT-WO3 Sensors

CNT-WO3 indirectly heated gas sensors were fabricated with carbon nanotubes as the dopant. The as-grown carbon nanotube was purified by mixed acid oxidation process and WO3 nanopowders were prepared by a chemical precipitation method. FT-IR, TEM, TG-DSC and XRD were introduced to characterize them. The gas sensitive performance of the made sensors was measured at room temperature. The experimental results show the gas sensitivity of the carbon nanotube-doped sensor is far higher than that of a pure WO3 sensor and the 0.8wt% carbon nanotube-doped sensor has the highest sensitivity. In addition, the carbon nanotube-doped sensor is superior for its lowest detectable concentration, wide detectable range and excellent gas selectivity. It is an ideal NH3 sensor.