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Related Experiment Video

Updated: May 21, 2025

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
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Reversible Photoresponsive Multicolor Fluorescent Carbon Dots for Repeatable Dynamic Information Encoding.

Qiang Fu1, Shouhong Sun1, Zhanhua Dong1

  • 1College of Engineering, Qufu Normal University, Rizhao, Shandong 276826, People's Republic of China.

ACS Applied Materials & Interfaces
|May 19, 2025
PubMed
Summary

Researchers developed photoresponsive carbon dots (CDs) with tunable multicolor fluorescence for UV light detection and information encryption. These CDs exhibit rapid, reversible color changes triggered by UV light and simple shaking, enabling dynamic data storage.

Keywords:
carbon dotsfluorescence discolorationmulticolorphotoresponsiverepeatable dynamic information encoding

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Photoresponsive carbon dots (CDs) show promise in UV light detection, anticounterfeiting, and information encryption.
  • Developing color-tunable, photoresponsive CDs with fast and reversible responses is a significant challenge.

Purpose of the Study:

  • To achieve photoresponsive multicolor fluorescence emission from carbon dots.
  • To develop a dynamic information encoding system based on these materials.

Main Methods:

  • Surface modification of carbon dots with varying concentrations of tetraethylenepentamine (TEPA).
  • Formation of UV-responsive naphthalimide structures on the carbon dot surface.
  • Characterization of fluorescence properties and response times.

Main Results:

  • Successfully achieved photoresponsive multicolor fluorescence emission from modified carbon dots.
  • Demonstrated rapid response times (as fast as 0.5 s) and reversible color changes via shaking.
  • Linked multicolor fluorescence to varying radical concentrations and energy bandgap changes due to TEPA modification.
  • Developed a repeatable dynamic information encoding system based on differential response times.

Conclusions:

  • TEPA surface modification enables controllable, multicolor photoresponsive fluorescence in carbon dots.
  • The developed carbon dots offer a promising platform for advanced applications like secure information encryption and dynamic data storage.