Mechanical and electrical properties of graphene-coated polyimide yarns improved by nitrogen plasma pre-treatment

Abstract

One-dimensional high-performance yarns with excellent conductivity and flexibility are of considerable interest in the energy and aerospace industries. However, how to achieve highly conductivity, excellent flexibility, extreme condition durability and high mechanical performance in one fiber material is still a great challenge using economically viable materials and synthesis technologies. Herein, we report electrically conductive yarns (modified polyimide (M-PI)/reduced graphene oxide (RGO) yarns) consisting of RGO coated on the surface of nitrogen plasma M-PI yarns, which are fabricated by combining the N2 plasma pre-treatment and repeated dip-coating and reducing technique. N2 plasma treatment is used to roughen the surface of the PI yarn and introduce functional groups, contributing to improve wettability, which can provide a stronger adhesion of the graphene coating. The dip-coating and reducing process was repeated 10 times to enhance the loading mass of RGO on the PI yarns, then M-PI/RGO yarns with better conductivity property can be obtained. The effects of N2 plasma treatment power and time on the M-PI yarns and M-PI/RGO yarns are investigated and discussed. The results demonstrate that the graphene layer is uniformly and densely coated on the PI yarn when being treated at 200 W for 8 min, and the conductivity of the M-PI/RGO yarn reaches 1.51 × 102 S/m. The M-PI/RGO yarn combine the advantages of RGO and PI yarns, retaining the mechanical properties and thermal stability of PI yarn while exploiting the conductive property of RGO. In addition, the enhanced adhesion between the PI yarn and graphene coating endows the composite yarns with excellent fastness and superior flexibility. This work describes an environmentally friendly, controllable and facile method to develop flexible and conductive functional graphene-coated PI yarns with high-performance properties.

A flexible, lightweight and stretchable all-solid-state supercapacitor based on warp-knitted stainless-steel mesh for wearable electronics

“…30 The D-band is relevant to structural defects or partially disordered structures in the graphite domain and the G-band is associated with graphitic carbon. 31 The intensity ratio (I D /I G ) of RGO@SSM increased compared to that of GO, 32,33 demonstrating the deposition of RGO on the SSM surface. After coating with PEDOT, the peak intensity of RGO becomes inconspicuous and the peaks of PEDOT emerged.…”

Yüksek Frekansli Rf Plazmalar İle Pmma Fi̇lmleri̇ni̇n Isilabi̇li̇rli̇ği̇ni̇n İyi̇leşti̇ri̇lmesi̇

“…Nitrogen containing plasmas are used to improve surface wettability [15], electrical conductivity [16] and biocompatibility [17]. Nitrogen gas plasma contains molecules located at many different electronic levels.…”

Surface modification of polyimide fibers for high-performance composite by using oxygen plasma and silane coupling agent treatment

“…Recently, in order to break through the limitation of poor interfacial adhesion of high-performance fibers, a variety of technologies have been applied, such as alkali treatment, thermal treatment, plasma treatment, silane coupling agent (CA) treatment, ozone treatment, atomic O 2 treatment, dopamine treatment, and carbon nanotubes treatment. [15][16][17][18][19][20][21][22][23][24][25][26] However, alkali treatment and thermal treatment will destroy the structure of PI fibers. Surface functionalization with polymer membranes can improve the interfacial properties between fiber and resin without impairing the mechanical properties of fibers, such as dopamine, silane CA, 27 and different random copolymers.…”