This study found out a heat treatment condition to improve the electrical conductivity of polyurethane (PU) nanoweb treated with non-oxidized graphene (nOG) ink. Electrical conductivity was imparted to the PU nanoweb (Pardam, s.r.o., Czech Republic) by a dip-coating process utilizing 1 wt% of nOG ink. To enhance the electrical conductivity, post heat treatment was conducted. The first specimen was completely dried at room temperature (20 °C) for 24 hours (Specimen GU), and the rest of the specimens were treated at 40 °C, 60 °C, 80 °C, and 100 °C for 1 hour (Specimen G40, G60, G80, and G100). To confirm the microstructure of the specimens, a FE-SEM (Field emission scanning electron microscopy) was utilized. The linear electrical resistance was evaluated using a Digital multimeter. Also, the thickness and weight of the specimens were measured by Cross section polisher and Analytical balance respectively. After that, the chemical structures were inspected using a FT-IR (Fourier transform infrared spectroscopy). As a result, when the heat treatment temperature was higher, the specimens were well immersed and more nOG ink was covered onto the surface of the treated specimens. Also, the electrical resistance of the specimens decreased in accordance with increased heat treatment temperature. The thickness and add-on of the specimens increased as the heat treatment temperature increased. The changes of band position of C=O, C-O-C, -NH- bending were observed by FT-IR analysis. Therefore, this study demonstrated that the heat treatment temperature played a significant role in the improvement of electrical conductivity, and the nOG/PU nanoweb had the most enhanced electrical conductivity when treated at 100 °C.

这项研究发现了一种热处理条件，可以改善用非氧化石墨烯（nOG）墨水处理的聚氨酯（PU）纳米纤维网的电导率。通过使用1 wt％的nOG油墨的浸涂工艺将导电性赋予PU纳米纤维网（捷克共和国，sro，Pardam）。为了提高导电性，进行了后热处理。将第一个标本在室温（20°C）下完全干燥24小时（标本GU），其余标本分别在40°C，60°C，80°C和100°C下处理1小时（标本G40，G60，G80和G100）。为了确认样品的微观结构，使用了FE-SEM（场发射扫描电子显微镜）。使用数字万用表评估线性电阻。也，样品的厚度和重量分别用截面抛光机和分析天平测量。之后，使用FT-IR（傅里叶变换红外光谱法）检查化学结构。结果，当热处理温度更高时，将样品充分浸没并且将更多的nOG墨水覆盖在处理过的样品的表面上。而且，样品的电阻随着热处理温度的升高而降低。样品的厚度和附加物随着热处理温度的升高而增加。通过FT-IR分析观察到C ＝ O，COC，-NH-弯曲的能带位置的变化。因此，这项研究表明，热处理温度在改善电导率方面起着重要作用，