【摘要】 以电浆电弧作为加热源来蒸发钨靶材,由气凝合成机制以及吹气装置制备W5O14纳米棒,并探讨了W5O14纳米棒的气体感测特性.实验过程中,使用氩气添加10%的氢气作为电浆气体,并在电流90A以及腔体压力53.3kPa下蒸发钨靶材.研究结果表明,在电浆气中加入10%氢气可成功地制备具有单晶结构的W5O14纳米棒,晶格间距为0.38nm,且W5O14纳米棒会沿着[010]方向成长,而W5O14纳米棒长宽比为12.7.透过参数作佳化的设计,发现W5O14纳米棒于48h,300℃下具有良好的热稳定性;气体感测研究结果表明,W5O14纳米棒在感测温度为200℃下对低浓度(1×10-6~4×10-6)的NO2气体具有良好的感测性质,随着气体浓度的增加其感测的灵敏度也会呈线性成长.更多还原

【Abstract】 Single-crystalline W5O14 nanorods were prepared by plasma arc gas condensation with assistance of blowing gas.The gas sensing property of W5O14 nanorods was further investigated.The results show that 10% hydrogen added into argon as plasma gas leads to the formation of W5O14 nanorods prepared under the current of 90 A and chamber pressure of 53.3 kPa.The growth direction of the nanorods goes along [010] and the corresponding lattice d-spacing is 0.38 nm.The aspect ratio of the nanorods can be 12.7.The excellent thermal stability of the nanorods was also evaluated under heat treatment at 300℃ for 48 h.In addition,W5O14 nanorods exhibit outstanding gas sensing property to NO2 gas concentration low as 1×10-6~4×10-6.The relationship between gas concentration and sensitivity presents linearity.更多还原