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CO2-Responsive Polymer-Functionalized Au Nanoparticles for CO2 Sensor.

Ying Ma¹, Kittithat Promthaveepong¹, Nan Li²

¹Department of Chemical and Biomolecular Engineering, National University of Singapore , 10 Kent Ridge Crescent, Singapore 119260.

Analytical Chemistry

|July 27, 2016

Summary

This summary is machine-generated.

Researchers developed a new sensor using gold nanoparticles coated with a CO2-responsive polymer. This sensor detects dissolved carbon dioxide (dCO2) with high sensitivity and improved convenience.

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Area of Science:

Nanomaterials Science
Polymer Chemistry
Chemical Sensing

Background:

Stimuli-responsive polymers (SRPs) on metallic nanoparticles (NPs) offer tunable optical properties for sensing.
Existing dissolved carbon dioxide (dCO2) sensors have limitations in sensitivity and sample preparation.

Purpose of the Study:

To develop a novel, highly sensitive sensor for dissolved carbon dioxide (dCO2).
To synthesize and characterize CO2-responsive polymer-coated gold nanoparticles (AuNPs).

Main Methods:

Synthesized gold nanoparticles (AuNPs) coated with poly(N-(3-amidino)-aniline) (PNAAN), a CO2-responsive polymer.
Utilized the protonation of the amidine group in PNAAN by dissolved CO2 to induce polymer swelling and AuNP aggregation.
Monitored changes in UV absorbance of AuNPs to quantify dCO2 levels.

Main Results:

The PNAAN-coated AuNPs exhibited aggregation and color change upon exposure to dCO2.
A sensitive dCO2 sensor was developed with a linear detection range from 0.0132 to 0.1584 hPa.
The sensor achieved a limit of detection (LOD) of 0.0024 hPa, demonstrating significant improvement over previous methods.

Conclusions:

The novel PNAAN-coated AuNP system provides a sensitive and convenient platform for dCO2 sensing.
This approach offers enhanced sensitivity and simplified sample preparation compared to existing dCO2 sensors.