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Reversible Light-Responsive Solventless-Liquid Switch: Polarization-Induced Dynamic Surface Ordering-Disordering in
Lopamudra Bhattacharjee1, Kallol Mohanta1, Sudip K Batabyal2
1Nanotech Research Innovation and Incubation Center, PSG Institute of Advanced Studies, Avinashi Road, Peelamedu, Coimbatore 641004, Tamil Nadu, India.
The Journal of Physical Chemistry Letters
|May 29, 2020
Summary
Researchers developed novel carbon quantum dot nano ionic materials (CQD-NIMs) that exhibit light-sensitive molecular switching. Dynamic ordering of the material
Area of Science:
- Materials Science
- Nanotechnology
- Photoconductivity
Background:
- Dynamic ordering-disordering of biomolecules via noncovalent interactions is common in biological systems.
- Carbon quantum dots (CQDs) are nanomaterials with unique optical and electronic properties.
- Understanding charge carrier dynamics in nanomaterials is crucial for developing advanced electronic devices.
Purpose of the Study:
- To investigate the effect of induced polarization on the charge carrier dynamics of CQD-based nano ionic materials (CQD-NIMs).
- To explore the potential of CQD-NIMs for light-sensitive molecular switching applications.
Main Methods:
- Synthesis of polystyrenesulfonate (PSS)-passivated CQD core-corona systems with polyetheramine (Jeffamine) canopy.
- Characterization of CQD-NIMs using impedance spectroscopy and steady-state fluorescence spectroscopy.
- Exposure of CQD-NIMs to simulated solar radiation under induced polarization.
Main Results:
- CQD-NIMs exhibited dielectric behavior between electrodes.
- Dynamic ordering-disordering of the corona around CQDs under induced polarization facilitated excess current flow.
- Reversible molecular-assembly-induced photoconducting behavior was observed in CQD-NIMs.
Conclusions:
- The study demonstrates a novel approach to control charge carrier dynamics in nanomaterials through induced polarization.
- The developed CQD-NIMs show promise for designing smart light-sensitive molecular switching devices.
- This work opens new avenues for developing advanced optoelectronic materials.
