中文摘要：

采用静电纺丝法制备了PVP/FeC6 H5 O7复合纳米纤维,并将复合纤维在500℃高温烧结3 h, X射线衍射分析（XRD）表明,烧结后的产物为正尖晶石结构的γ-Fe2O3晶体.扫描电子显微镜（SEM）观测结果表明,制得了直径均匀、连续的复合纳米纤维,其平均直径约为1000 nm；烧结后的γ-Fe2 O3纳米纤维保持了其连续性,但纤维发生了收缩,直径较烧结前小,平均约为600 nm.比表面积分析表明,γ-Fe2 O3纳米纤维比表面积为57.18 m2/g.气敏性能测试结果表明,230℃为γ-Fe2 O3纳米纤维检测丙酮气体的最佳工作温度.在此温度下,γ-Fe2O3纳米纤维对丙酮气体表现出高响应度[S=6.9, c（Acetone）=7.88×104 mg/m3]和线性度（7.88×10^2-1.58×10^5 mg/m3浓度范围内）.同时,γ-Fe2O3纳米纤维气体传感器件还表现出良好的长期稳定性.

英文摘要：

PVP/FeC6 H5 O7 composite nanofibers were prepared via electrospinning method. After 3 h of calci-nations, the composite PVP/FeC6 H5 O7 nanofibers were turned to γ-Fe2 O3 nanofibers. X-ray diffraction （ XRD） , scanning electron microscopy（ SEM） and the Brunauer-Emmett-Teller（ BET） method were employed to characterize the products. Before calcinations, the composite nanofibers had smooth and uniform surfaces with an average diameter about 1000 nm. After calcinations, the nanofibers shrank but maintained the continuous structures with an average diameter about 600 nm. When used to detect acetone, sensor based onγ-Fe2O3 nanofibers exhibited high response, good linear dependence（7.88×102-1.58×105 mg/m3）, fast response and recovery speed at 230 ℃. The sensor also showed good stability. These properties make theγ-Fe2 O3 nanofibers good candidates for acetone detection.