Interfacial Interaction Monitoring and Constitutional Isomer Discrimination Using a Graphene-Integrated Terahertz...

Area of Science:

• Terahertz spectroscopy
• Materials science
• Analytical chemistry

Background:

• Isomer identification is crucial for molecular design and quality control.
• Conventional methods for isomer analysis are often destructive or require large sample volumes.
• On-chip, nondestructive isomer discrimination remains a significant analytical challenge.

Purpose of the Study:

• To develop a novel platform for nondestructive, on-chip constitutional isomer discrimination.
• To enable sensitive monitoring of molecular behavior at interfaces.
• To overcome limitations of existing analytical techniques for isomer analysis.

Main Methods:

• Integration of a graphene layer onto a terahertz metasurface with nanoslot cavities.
• Utilizing a floated graphene monolayer as an active probing pad for terahertz field confinement.
• Measuring graphene-analyte interaction rate and conductivity changes for isomer differentiation.

Main Results:

• Achieved nondestructive, on-chip constitutional isomer discrimination using a compact metasurface.
• Demonstrated a nanogram scale limit of detection for molecular analysis.
• Successfully distinguished constitutional isomers based on their electronic properties and interfacial interactions.

Conclusions:

• The proposed graphene-integrated terahertz metasurface offers a sensitive, label-free method for isomer discrimination.
• The platform enables on-chip monitoring of molecular behavior with high efficiency and low sample volume.
• This technology holds promise for advanced molecular characterization and tracking in various applications.