Influence of single-wall carbon nanotubes on Langmuir–Blodgett films of ferroelectric liquid crystals as studied by atomic force microscopy

Abstract

Langmuir–Blodgett films of ferroelectric liquid crystal (LC) doped with low concentration of single-wall carbon nanotubes have been prepared and characterised. Pressure–area isotherms show that the films are stable and have good spreading properties. The interaction between nanotubes and LC molecules in the monolayer was increased during barrier compression, resulting in increased surface pressure. We observed phase change with increasing nanotube concentration in ferroelectric LC matrix. Atomic force microscopy profiles indicate uniform deposition of material on single crystal silicon wafer.

Keywords:

• Langmuir–Blodgett films
• functionalised single-wall carbon nanotubes
• ferroelectric liquid crystal
• isotherm
• atomic force microscopy

Acknowledgements

The authors wish to thank Ms L.K. Brar for many helpful discussions during this work. The valuable comments and suggestions from reviewer are also gratefully acknowledged.

Funding

Financial support in form of Senior Research Fellowship from University Grants Commission (UGC), India is thankfully acknowledged.