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

doi:10.3724/SP.J.1077.2014.13289

Abstract

Abstract:

Aligned V₂O₅micro-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. V₂O₅micro-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 V₂O₅micro-nano fiber membrane has the higher sensitivity to ethanol gas than to CH₄or NH₃ gas at 300℃. The sensitivity of aligned V₂O₅micro-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.

Key words: V₂O₅, electrospinning, micro-nano fiber membrane, alignment degree, gas sensing property

CLC Number:

TB321

TANG Yu-Fei, XIE Gao-Wei, ZHAO Kang, JIANG Lei, TENG Le-Tian. Fabrication and Gas Sensing Properties of Aligned Vanadium Pentoxide Micro-nano Fiber Membranes by Electrospinning[J]. Journal of Inorganic Materials, 2014, 29(3): 315-320.

Figures/Tables 7

Fig. 1 XRD pattern of V2O5 micro-nano fiber membranes

Table1 Diameter distribution and alignment degree of V2O5 micro-nano fiber membranes

Parallel collecting electrode space/mm	Average diameter/nm	Ordering degree /%
1	223.1	20.5
2	437.4	28.2
3	613.1	66.0
4	877.3	35.8

Fig. 2 SEM images and fiber ordering distribution (insert images) of V2O5 micro-nano fiber membranes fabricated by different parallel collecting electrode spaces (a) 1 mm; (b) 2 mm; (c) 3 mm; (d) 4 mm

Fig. 3 Gas sensitivity of V2O5 micro-nano fiber membranes at different gas atmosphere

Fig. 4 Resistances and gas sensitivities of V2O5 micro-nano fiber membranes fabricated by different parallel collecting electrode spaces as a function of temperature at 200 mg/L C2H5OH gas atmosphere (a) Resistance; (b) Gas sensitivity

Fig.5 Resistances (a) and gas sensitivities (b) of V2O5 micro-nano fiber membranes fabricated by different parallel collecting electrode spaces as a function of C2H5OH gas concentration at 300 ℃

Fig. 6 Gas response recovery curves of V2O5 micro-nano fiber membranes fabricated by different parallel collecting electrode spaces at 300 ℃ and 200 mg/L C2H5OH gas atmosphere (a) 1 mm; (b) 2 mm; (c) 3 mm: (d) 4 mm

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