Aligned Carbon Nanotube Structures:Transfer,Modification And Applications

As a unique nanomaterial system,aligned carbon nanotubes(CNTs)structures combine the excellent properties of CNTs,the overall anisotropy and the superior operability for their macroscopic sizes,and have been the focus of nanomaterials.In this thesis,three kinds of aligned carbon nanotube structures with different dimensions were studied,and application-oriented research was carried out.The transfer of 3D aligned CNT structures was realized by an ice-assisted transfer technology.Super-aligned carbon nanotube(SACNT)arrays can be transferred onto a variety of substrates without losing their spinnability,efficiently decoupling the growth and application of SACNT arrays.The transfer-then-spin strategy was developed to produce patterned SACNT arrays,which can be used as 3D electrodes for thermoacoustic chips to simplify the manufacturing process.Moreover,transferred CNT arrays are also promising field electron emitters.The modification of 3D aligned CNT structures and the production of 1D aligned CNT structures were also studied.SACNT arrays were successfully modified by oxygen plasma,and CNT composite yarns were derived from the as-modified SACNT arrays.Oxygen plasma not only removed the disordered CNT networks on the surface of the array,but also introduced oxygen-containing functional groups to CNTs,improving the interaction between CNTs and polymer enhancers.CNT composite yarns with high tensile strengths up to 2.2 GPa and Young's moduli more than 200 GPa can be produced from the SACNT array modified under optimized conditions.The application range of 2D aligned CNT structures was expanded.A flash evaporation printing(FEP)method using SACNT films was invented,incorporating conventional physical vapor deposition technique and printing technology,and providing an efficient approach for printing thin films with high quality.Perovskite thin films were prepared using FEP,and detailed analysis revealed the as-printed thin films have ideal crystalline.The photovoltaic devices based on perovskites were further fabricated and tested to demonstrate the potential applications of FEP.