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Color-switchable, emission-enhanced fluorescence realized by engineering C-dot@C-dot nanoparticles.

Zhen Guo1, Zhiqiang Zhang, Wei Zhang

  • 1CAS Key Lab of Bio-Medical Diagnostics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences , No. 88, Keling Road, Suzhou New District 215163, People's Republic of China.

ACS Applied Materials & Interfaces
|November 20, 2014
PubMed
Summary

Researchers developed color-switchable fluorescent carbon nanodots (C-dots) from citric acid. Conjugating these C-dots into nanoparticles enhanced their fluorescence and absorption properties for applications in flow cytometry and cell imaging.

Keywords:
color switchingconjugating nanoparticlesemission enhancementfluorescent carbon nanodots

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Carbon nanodots (C-dots) are fluorescent nanomaterials with potential applications in bioimaging.
  • Tuning the optical properties of C-dots is crucial for advanced applications.
  • Developing novel C-dot structures with enhanced fluorescence is an active area of research.

Purpose of the Study:

  • To prepare and characterize color-switchable fluorescent carbon nanodots (C-dots).
  • To investigate the effect of conjugation on C-dot optical properties.
  • To explore the potential applications of conjugated C-dots in flow cytometry and cell imaging.

Main Methods:

  • Hydrothermal decomposition of citric acid to synthesize C-dots.
  • Conjugation of C-dots to form C-dot@C-dot nanoparticles.
  • Characterization of optical properties including fluorescence emission, absorption spectra, and fluorescence lifetimes.

Main Results:

  • Synthesized C-dots exhibited dark turquoise and green-yellow fluorescence under UV illumination.
  • Conjugation resulted in dark green fluorescent C-dot@C-dot nanoparticles with a blue-shifted emission.
  • The C-dots demonstrated color-switchable fluorescence (goldenrod, green-yellow, gold) under different excitation wavelengths.
  • Conjugation led to enhanced, red-shifted absorption due to extended π-conjugation and N incorporation.
  • Fluorescence lifetimes were measured, showing an increased radiative rate in C-dot@C-dot nanoparticles.

Conclusions:

  • Color-switchable fluorescent C-dots were successfully prepared and characterized.
  • Conjugation significantly alters C-dot optical properties, enhancing fluorescence and absorption.
  • The developed C-dot@C-dot nanoparticles show promise for applications in flow cytometry and cell imaging.