以化学气相沉积(CVD)法制备的石墨烯和碳纳米管的邻二氯苯分散液为原料,采用滴涂法制备石墨烯/碳纳米管复合薄膜,用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、拉曼光谱(Raman)和X射线光电子能谱(XPS)对其形貌和结构进行表征.实验发现随着碳纳米管分散液浓度的增大,复合薄膜结构中碳纳米管的面密度线性增大.利用紫外-可见光谱仪和四探针测试仪表征了不同碳纳米管浓度下复合薄膜的透光率及其薄层电阻,结果表明:随着碳纳米管浓度的增大,复合薄膜的透光率及其薄层电阻都将减小,当碳纳米管浓度为0.1 mg/mL时,复合薄膜的透光率(550 nm)及其薄层电阻分别为92.18%和0.998 kΩ/口.实验通过调节碳纳米管浓度制备得到不同性能的石墨烯/碳纳米管复合薄膜,该复合薄膜在透明电极、场效应晶体管和激光锁模等方面具有潜在应用.
Hybrid thin films were prepared via a drop-coating method by using graphene prepared by chemical vapor deposition(CVD) and carbon nanotube dispersed in 1,2-dichlorobenzene as crude materials.The structure and morphology of hybrid thin films were characterized by scanning electron microscope (SEM),transmission electron microscopy (TEM),Raman spectroscopy and X-ray photoelectron spectroscopy (XPS).It was found that surface density of carbon nanotube in the hybrid thin films increased linearly with the increase of dispersion concentration.Furthermore,the transmittance and sheet resistance of the hybrid thin films,which were characterized by UV-visible spectroscope and four-point probe analyzer,respectively,both significant decreased when concentration of the dispersed carbon nanotube increased.The two parameters,to be specific,were found to be 92.18% (at 550 nm) and 0.998 kΩ/m,respectively as the concentration of the dispersed carbon nanotube reaching 0.1 mg/mL.In other words,the performances of the hybrid thin films can be improved by regulating concentration of carbon nanotube in the dispersion,showing the films potential applications in the fields of transparent electrodes,field effect transistors and laser mode-locking.
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