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Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes

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Molecular sensing: modulating molecular conduction through intermolecular interactions.

Julia Del Re¹, Martin H Moore, Banahalli R Ratna

¹McGill University, 801 Sherbrooke St W., Montreal, Canada H3A 0B8.

Physical Chemistry Chemical Physics : PCCP

|April 26, 2013

Summary

This summary is machine-generated.

Oligophenylene-vinylene (OPV) molecules show altered conductivity and fluorescence when interacting with aromatic compounds. Electron-withdrawing groups on molecules like nitrobenzene significantly impact OPV, suggesting its use as a chemical sensor.

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Area of Science:

Molecular electronics
Chemical sensing
Organic electronics

Background:

Oligophenylene-vinylene (OPV) molecules are key components in organic electronics.
Understanding molecular interactions is crucial for developing advanced sensors.
Previous research has explored the electronic properties of OPV but less on their sensing capabilities for specific analytes.

Purpose of the Study:

To investigate the effect of small aromatic molecules on the molecular conductivity and fluorescence of individual OPV molecules.
To determine the relationship between the chemical properties of aromatic molecules and their impact on OPV.
To assess the potential of OPV as a sensor for detecting specific aromatic compounds.

Main Methods:

Correlating fluorescence spectroscopy with scanning tunneling microscopy (STM) measurements.
Exposing individual OPV molecules to various small aromatic molecules, including nitrobenzene, 1,4-dinitrobenzene, and toluene.
Analyzing changes in fluorescence intensity and molecular conductivity.

Main Results:

Nitrobenzene and 1,4-dinitrobenzene significantly decreased both fluorescence intensity and molecular conductivity of OPV.
Toluene, lacking strong electron-withdrawing groups, showed no significant effect on OPV properties.
The observed changes in OPV were found to correlate with the electron-withdrawing strength of the interacting aromatic molecules.

Conclusions:

Individual OPV molecules exhibit sensitivity to interactions with small aromatic molecules.
The electron-withdrawing ability of aromatic compounds is a critical factor influencing OPV's electronic and optical properties.
OPV molecules show promise as a sensor platform for detecting aromatic compounds, particularly those with electron-withdrawing functionalities.