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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

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Optical ammonia sensor based on upconverting luminescent nanoparticles.

Heike S Mader¹, Otto S Wolfbeis

¹Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, D-93040 Regensburg, Germany.

Analytical Chemistry

|May 21, 2010

Summary

This summary is machine-generated.

This study presents a novel ammonia sensor using upconverting nanoparticles (UCNPs) and a pH probe. The sensor offers a selective and sensitive method for detecting ammonia in complex samples by utilizing luminescence changes.

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Area of Science:

Materials Science
Analytical Chemistry
Nanotechnology

Background:

Upconversion luminescence (UCL) offers advantages for sensing due to its background-free signal.
Existing ammonia sensors may struggle with complex sample matrices.
Phenol red is a pH-sensitive dye suitable for optical detection.

Purpose of the Study:

To develop a novel optical sensor for ammonia detection.
To utilize upconverting nanoparticles (UCNPs) for signal generation and referencing.
To leverage the spectral changes of phenol red in response to ammonia.

Main Methods:

Fabrication of a sensor film incorporating NaYF(4):Yb,Er upconverting nanoparticles (UCNPs) and phenol red within a polystyrene matrix.
Excitation of UCNPs using a 980 nm laser source.
Monitoring changes in UCNP luminescence (green and red emission) upon exposure to ammonia.

Main Results:

Ammonia exposure caused increased absorption at 560 nm by phenol red, quenching the green UCNP emission.
The red UCNP emission remained unaffected, serving as a stable reference signal.
The 980 nm excitation provided a background-free optical signal, ideal for complex matrices.

Conclusions:

The developed sensor effectively detects ammonia by exploiting the interplay between UCNP luminescence and pH probe absorption.
The use of red emission as a reference signal enhances sensor reliability.
This UCL-based sensor demonstrates high potential for ammonia sensing in challenging environments.