Layer-by-layer assembly of graphene and polyaniline for electrochromic devices

• Main Author: Mok, Kai Jie.
• Other Authors: Lu Xuehong
• Format: Final Year Project
• Language: English
• Published: 2011
• Subjects: DRNTU::Engineering::Materials::Microelectronics and semiconductor materials
• Online Access: http://hdl.handle.net/10356/44083
• Institution: Nanyang Technological University

Multilayer structured film of graphene and polyaniline was fabricated by the layer-by-layer assembly technique using dip coating. A precursor layer of branched polyethylenimine was deposited to assist in a more stable build up of subsequent graphene and polyaniline layers. The completed multilayer film was reduced by hydrazine monohydrate and conductivity measured by 4-point probe was found to increase by about 125 times to 0.55 S/cm. AFM images presented random flake structures of graphene and Raman spectroscopy were used to determine the presence of its oxidised and reduced states. Reoxidation/redoping of the reduced film using oxidising agent, ferric chloride, showed a 1.7 times increase of conductivity to 0.93 S/cm.