摘要
为了提高微纳米纤维膜气敏材料的灵敏度和响应时间, 本研究采用静电纺丝法结合分离式平行收集极制备有序排列的V2O5微纳米纤维膜, 利用XRD、SEM等手段表征纤维膜的相组成、微观形貌以及有序程度, 探讨了有序程度对V2O5气体灵敏度、响应时间以及恢复能力的影响。研究结果表明： 500℃煅烧后所得微纳米纤维膜由V2O5相组成。平行收集极间距对纤维膜的微观形貌影响较大, 当间距为3 mm时可以获得有序程度为66%的V2O5微纳米纤维膜, 其在80-400℃范围内电阻的变化幅度约为2个数量级。当工作温度为300℃时, V2O5微纳米纤维膜对C2H5OH的灵敏度均高于CH4和NH3, 其中有序V2O5微纳米纤维膜对浓度为200 mg/L C2H5OH气体的灵敏度约为0.9, 响应时间为3 s, 但恢复性能较低, 62 s后阻值仅恢复到初始阻值的55%。
Aligned V2O5 micro-nano fiber membrane was fabricated by combination of electrospinning method and separate parallel collector to improve the sensitivity and response time of the micro-nano fiber membrane, a gas sensitive material. The phase composition, morphology and the alignment degree of the fiber membrane were characterized by XRD and SEM. The influences of the alignment degree of fiber membrane on the gas sensitive materials’ sensitivity, response time and response recovery were studied. The results show that micro-nano fiber membrane is composited by V2O5 phase after sintering at 500℃. The distance between the parallel collectors is a key factor of fibers membrane morphology. V2O5 micro-nano fiber membrane with the alignment degree of 66% is obtained when the distance between the parallel collectors is 3 mm. The change of its resistance is about two orders of magnitude at 80-400℃. The V2O5 micro-nano fiber membrane has the higher sensitivity to ethanol gas than to CH4 or NH3 gas at 300℃. The sensitivity of aligned V2O5 micro-nano fiber membrane to ethanol with a concentration of 200 mg/L is 0.9, the fastest response time is 3 s and the response recovery of resistance is only 55% of initial value after 62 s.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第3期315-320,共6页
Journal of Inorganic Materials
基金
教育部高等学校博士学科点专项科研基金(20106118110002)
陕西省自然科学基金重点项目(2012JZ6001)
陕西省教育厅科研计划项目(12JK0428)~~
关键词
V2O5
静电纺丝
微纳米纤维膜
有序程度
气敏特性
V2O5
electrospinning
micro-nano fiber membrane
alignment degree
gas sensing property
