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An Aptamer-based Sensor for Unchelated GadoliniumIII
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1,3,5-Trinitrotoluene Sensor Based on Silole Nanoaggregates.

Bomina Shin1, Honglae Sohn1

  • 1Department of Chemistry, Chosun University, Gwangju 501-759, Korea.

Journal of Nanoscience and Nanotechnology
|October 27, 2018
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Summary

New nanoaggregates utilizing aggregation-induced emission enable sensitive detection of trinitrotoluene (TNT). These materials show a significant increase in quantum yield and a linear response for TNT detection via photoluminescence quenching.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Aggregation-induced emission (AIE) is a phenomenon where luminogens are non-emissive when molecularly dissolved but become highly emissive upon aggregation.
  • Developing sensitive and selective detection methods for explosives like trinitrotoluene (TNT) is crucial for security applications.

Purpose of the Study:

  • To develop novel bis(methyltetraphenyl)silole and bis(methyltetraphenyl)silole siloxane nanoaggregates for TNT detection.
  • To investigate the photophysical properties and aggregation behavior of these nanoaggregates.
  • To evaluate their performance in detecting TNT using aggregation-induced emission.

Main Methods:

  • Synthesis of bis(methyltetraphenyl)silole and bis(methyltetraphenyl)silole siloxane nanoaggregates.
  • Measurement of absolute quantum yields and critical water concentrations.
  • Tuning of average particle size by controlling water fraction.
  • Detection of TNT via photoluminescence (PL) quenching measurements.
  • Analysis of the Stern-Volmer relationship for TNT detection.

Main Results:

  • Nanoaggregates of both bis(methyltetraphenyl)silole and bis(methyltetraphenyl)silole siloxane were successfully developed.
  • Absolute quantum yields increased over 40-fold at a 90% water volume fraction.
  • Particle size was tunable by adjusting the water fraction.
  • Photoluminescence quenching was observed upon addition of TNT, indicating successful detection.
  • A linear Stern-Volmer relationship confirmed the quantitative detection of TNT.

Conclusions:

  • The developed nanoaggregates exhibit enhanced photoluminescence through aggregation-induced emission, making them suitable for TNT detection.
  • The materials demonstrate high sensitivity and a clear quantitative relationship for TNT detection.
  • These AIE-based nanoaggregates represent a promising platform for the development of advanced explosive detection systems.