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Updated: May 30, 2026
Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
Published on: June 1, 2016
Memory effect in an ionic liquid matrix containing single-walled carbon nanotubes and polystyrene.
Di Wei1, Jayanta K Baral, Ronald Osterbacka
1Process Chemistry Centre, c/o Laboratory of Analytical Chemistry, Åbo Akademi University, Biskopsgatan 8, FIN-20500 Åbo/Turku, Finland. Centre of Advanced Photonics and Electronics, Department of Engineering, University of Cambridge, 9 J J Thomson Avenue, Cambridge CB3 0FA, UK.
Researchers developed a novel memory device using an ionic liquid gel with carbon nanotubes and polystyrene. Adjusting nanotube concentration tuned electrical properties, enabling insulator, conductor, or memory switching behaviors.
Area of Science:
- Materials Science
- Nanotechnology
- Electrical Engineering
Background:
- Ionic liquids (ILs) offer unique properties for advanced material applications.
- Single-walled carbon nanotubes (SWNTs) are known for their exceptional electrical and mechanical characteristics.
- Polystyrene (PS) serves as a versatile insulating matrix in composite materials.
Purpose of the Study:
- To investigate the potential of an ionic liquid gel composite as a memory device.
- To explore the effect of varying single-walled carbon nanotube (SWNT) concentrations within a polystyrene (PS) matrix.
- To characterize the distinct electrical properties achievable by tuning SWNT content.
Main Methods:
- Fabrication of a composite gel by blending SWNTs and PS beads in the ionic liquid 1-butyl-3-methyl-hexafluorophosphate ([BMIM][PF6]).
- Assembly of the composite gel into a memory device structure between indium tin oxide (ITO) glass and an aluminum electrode.
- Electrical characterization of the device by varying SWNT concentrations to observe changes in conductivity and switching behavior.
Main Results:
- The composite device exhibited tunable electrical properties, transitioning between insulator, conductor, and memory states.
- Negative differential resistance (NDR) and electric bistable switching were observed.
- The memory switching occurred between high-impedance (OFF) and low-impedance (ON) states, with current changes spanning five orders of magnitude.
Conclusions:
- The ionic liquid gel matrix incorporating SWNTs and PS is a viable platform for developing tunable memory devices.
- Concentration control of SWNTs within the insulating PS matrix is a key factor in achieving diverse electrical functionalities.
- This approach offers a promising route for novel electronic memory applications.
