Reduced graphene oxide (rGO) and its composite films have aroused intense interest in electrical heating and temperature sensing fields, but the working temperature is usually limited because the internal layer-stacked structure is breakable at high temperature. In order to promote structure stability, a series of AlO fiber/rGO composite films were developed. It is found that gaseous products mainly including CO and CO during thermal reduction contribute to pores, bulges and intervals in rGO films, while appropriate AlO fiber has an adhesion effect on rGO sheets and tightens them together, in which case defects can hardly form and the layered structure is significantly compacted. Therefore, the degree of stacking order and tensile strength tend to increase, resulting in the improvement of structure stability and decrease of electrical resistivity. However, excess AlO fiber makes the formation of debris and cracks, causing the deterioration of conductivity and mechanical properties. With 20 wt% AlO fiber, the composite films can bear higher heating voltage than pure rGO films and stabilize at 634.65 °C under 36 V, which also keep a good linearity between resistance and temperature from 25 to 600 °C, exhibiting a considerable temperature coefficient of resistance (TCR) with −1.70×10 /°C at room temperature.

中文翻译：

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用于高温加热和传感的氧化铝纤维/还原氧化石墨烯复合薄膜


还原氧化石墨烯（rGO）及其复合薄膜引起了电加热和温度传感领域的浓厚兴趣，但由于内部层状堆叠结构在高温下易破裂，工作温度通常受到限制。为了提高结构稳定性，开发了一系列Al2O3纤维/rGO复合薄膜。研究发现，热还原过程中主要包括CO和CO的气态产物导致了rGO薄膜中的孔隙、凸起和间隔，而适当的Al2O3纤维对rGO片材具有粘合作用，并将它们紧密地结合在一起，在这种情况下很难形成缺陷，并且层状结构显着致密。因此，堆叠有序度和拉伸强度趋于增加，从而导致结构稳定性的提高和电阻率的降低。然而，过量的Al2O3纤维会形成碎片和裂纹，导致导电性和机械性能恶化。含有20 wt% Al2O纤维的复合薄膜可以承受比纯rGO薄膜更高的加热电压，并在36 V下稳定在634.65 °C，并且在25至600 °C范围内电阻与温度之间保持良好的线性，表现出相当的温度室温下电阻系数（TCR）为-1.70×10 /°C。