Fabrication and Gas Sensing Properties of Aligned Vanadium Pentoxide Micro-nano Fiber Membranes by Electrospinning

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 char- acterized by XRD and SEM. The influences of the alignment degree of fiber membrane on the gas sensitive materi- als' sensitivity, response time and response recovery were studied. The results show that micro-nano fiber mem- brane 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 ob- tained 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.