【作者】 郭兰兰； 寇雪莹； 孙彦峰； 卢革宇；

【Author】 Lanlan Guo;Xueying Kou;Yanfeng Sun;Geyu Lu;State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University;

【机构】 吉林大学电子科学与工程学院；

【摘要】 本文采用单轴静电纺丝的方法成功的制备了α-Fe₂O₃纳米带以及1.0 wt%rGO/α-Fe₂O₃的复合纳米纤维。之后,我们用大量的技术手段对其结构和形貌进行了表征。结果显示,纯的α-Fe₂O₃纳米带的宽度大概是200nm,而1.0 wt%r GO/α-Fe₂O₃复合纳米线纤维的直径大概是100 nm。除此之外,我们还对其气敏性能分别做了测试。1.0 wt%r GO/α-Fe₂O₃复合纳米线纤维在375°C对100 ppm丙酮有很好的响应、重复性和长期稳定性,其响应值为8.9,是纯α-Fe₂O₃纳米带的4倍。最后我们对r GO/α-Fe₂O₃纳米纤维的气敏机理做了推测和解释。我们认为,还原氧化石墨烯和α-Fe₂O₃之间存在着的欧姆接触,空气中烧结后还原氧化石墨烯自身的缺陷以及两者之间存在的纳米级p-n异质结起着关键的作用。更多还原

【Abstract】 Pure α-Fe₂O₃ nanobelts（NBs） and 1.0 wt% reduced graphene oxide（r GO）/α-Fe₂O₃ composite nanofibers（NFs） have been successfully synthesized by a homotaxial electrospinning method. Various techniques were employed for the characterization of the nanostructure and morphologies. The results indicate that pure α-Fe₂O₃ NBs have uniform widths about 200 nm andr GO/α-Fe₂O₃ NFs have diameters approximately 100 nm. In addition, the gas sensing properties were also investigated. It is found that 1wt% r GO/α-Fe₂O₃ shows good response, excellent repeatability and long-term stability to 100 ppm acetone at 375 °C, which is superior to other nanofibers. The response of 1 wt%r GO/ α-Fe₂O₃ nanofibers to 100 ppm acetone is about 8.9, which is about 4 times higher than pure α-Fe₂O₃ NBs. Finally, we have proposed that the creation of ohmic contact, defects on the r GO nanosheets surface and local p-n heterojunctions play significant roles in raising the sensitivity ofr GO/α-Fe₂O₃ NFs.更多还原