Deciphering the Interface between Two-Dimensional Aluminum Quasicrystals and Norepinephrine Neurotransmitter

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Norepinephrine (NE) is a critical neurotransmitter regulating physiological and cognitive functions.
• Accurate NE detection is vital for diagnostics and therapeutic monitoring.
• Existing detection methods may lack sensitivity or selectivity.

Purpose of the Study:

• To elucidate the molecular interactions between NE and a 2D multielement aluminum quasicrystal (2D-Al QC).
• To develop a highly sensitive and selective electrochemical sensor for NE detection based on these interactions.
• To evaluate the sensor's performance characteristics, including detection limits, selectivity, and stability.

Main Methods:

• Vibrational spectroscopy and theoretical simulations (geometry optimization, charge transfer, bond length analysis) to study NE-2D-Al QC interactions.
• In situ liquid cell transmission electron microscopy (LCTEM) for real-time atomic-scale monitoring.
• Fabrication and electrochemical characterization of a 2D-Al QC-based sensor for NE detection.

Main Results:

• Confirmed binding of NE's -OH group to 2D-Al QC aluminum atoms via Al-O bonds.
• Developed an electrochemical sensor with two linear detection ranges: 1 nM to 1 μM and 1 pM to 500 pM.
• Achieved ultralow detection limits (0.42 ± 0.02 nM, 0.17 ± 0.04 pM), excellent selectivity, reproducibility (3% variation), and long-term stability (>90 days, 4.6% deviation).

Conclusions:

• The 2D-Al QC exhibits specific binding with NE, enabling its electrochemical detection.
• The developed sensor demonstrates superior sensitivity, selectivity, and stability for NE monitoring.
• 2D-Al QC-based sensors represent a promising platform for point-of-care diagnostics and neurochemical monitoring.