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Localized surface plasmon-enhanced nanosensor platform using dual-responsive polymer nanocomposites.

Jaesuk Choi¹, Min-Jae Choi, Jung-Keun Yoo

¹Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.

|July 6, 2013

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A new dual-responsive nanocomposite sensor significantly enhances liquid identification selectivity by 30 times. This localized surface plasmon resonance (LSPR) sensor offers improved safety and practical applications for real-time solvent monitoring.

Area of Science:

Nanotechnology and Materials Science
Chemical Sensing and Spectroscopy

Background:

Accurate identification of unknown liquids is crucial for safety and security.
Localized surface plasmon resonance (LSPR) sensors show high sensitivity for chemical detection.

Purpose of the Study:

To develop a dual-responsive nanocomposite LSPR sensor with enhanced selectivity for liquid identification.
To improve upon single-responsive LSPR sensors for distinguishing diverse liquids.

Main Methods:

Fabrication of a dual-responsive nanocomposite using two types of polymer brushes and two noble metal nanoparticles.
Utilizing the differential response of hydrophobic and hydrophilic polymer brushes to liquid interactions.
Employing LSPR spectroscopy for sensing measurements.

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Main Results:

The dual-responsive LSPR sensor achieved a 30-fold improvement in the figure-of-merit for liquid selectivity compared to single-responsive sensors.
The sensor accurately estimated the mixing ratio of binary solvent mixtures.
Demonstrated high practicality for in situ process monitoring.

Conclusions:

A dual-responsive nanocomposite LSPR sensor platform offers superior selectivity for liquid identification.
This technology is highly promising for real-time monitoring of chemical compositions in various applications.