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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

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Li@C₆₀ as a multi-state molecular switch.

Henry J Chandler¹, Minas Stefanou², Eleanor E B Campbell^2,3

¹EaStCHEM and School of Chemistry, University of St Andrews, North Haugh, St Andrews, KY16 9ST, UK.

Nature Communications

|May 25, 2019

Summary

Researchers developed a 14-state molecular switch using Li@C60, a significant advancement in molecular electronics. This novel switch utilizes resonant tunneling for Li activation, enabling more stable multi-state molecular devices.

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Area of Science:

Molecular electronics
Nanotechnology
Quantum chemistry

Background:

Molecular switches are key components for miniaturizing electronic devices.
Existing molecular switches have limited multi-state capabilities (up to six states).
Molecular decomposition is a challenge in developing stable molecular switches.

Purpose of the Study:

To report a novel multi-state single molecule switch.
To investigate the switching mechanism of endohedral fullerenes.
To achieve a higher number of accessible molecular states.

Main Methods:

Low temperature scanning tunneling microscopy (STM).
Scanning tunneling spectroscopy (STS).
Investigating endohedral fullerene Li@C60.

Main Results:

Demonstrated a single molecule switch with 14 distinct states.
Statistically accessed multiple molecular states.
Proposed a switching mechanism involving resonant tunneling via superatom molecular orbitals (SAMOs).

Conclusions:

Li@C60 functions as a highly multi-state molecular switch.
Resonant tunneling via SAMOs enables Li activation, bypassing cage decomposition.
This work advances the development of complex molecular electronic components.