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Solvent dependent optical switching in carbazole-based fluorescent nanoparticles.

Ravi M Adhikari¹, Bipin K Shah, Sujeewa S Palayangoda

¹Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|January 22, 2009

Summary

Stable fluorescent organic nanoparticles were created from ethynylphenyl carbazoles. Their color emission can be switched on/off, and they show potential for chemical vapor sensing applications.

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Area of Science:

Organic chemistry
Materials science
Nanotechnology

Background:

Ethynylphenyl carbazoles are organic compounds with potential fluorescent properties.
Organic nanoparticles offer unique characteristics for various applications.
Controlling nanoparticle properties is crucial for targeted use.

Purpose of the Study:

To synthesize stable fluorescent organic nanoparticles from ethynylphenyl carbazoles (PBM and PPM).
To investigate the influence of solvent mixtures on nanoparticle size and optical properties.
To explore the potential of these nanoparticles as chemical vapor sensors.

Main Methods:

Synthesis of ethynylphenyl carbazoles (PBM and PPM).
Preparation of organic nanoparticles using varying tetrahydrofuran/water ratios.

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Characterization of nanoparticle size and fluorescence emission spectra.

Evaluation of nanoparticle response to chemical vapors.

Main Results:

Stable fluorescent organic nanoparticles were successfully formed.
Nanoparticle emission color (blue-green to orange-red) was reversibly switched by altering the solvent ratio.
Nanoparticle size varied with the solvent ratio.
Emissions were red-shifted in nanoparticles compared to dilute solutions, attributed to charge transfer complexes.

Conclusions:

Ethynylphenyl carbazole nanoparticles exhibit tunable fluorescence properties.
The observed red-shift is due to intermolecular charge transfer within the nanoparticle state.
These nanoparticles show promise for development into chemical vapor sensors.