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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Compact Quantum Dots for Single-molecule Imaging
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Highly luminescent pH-responsive carbon quantum dots for cell imaging.

Xiaohui Fan1, Yang Wang1, Bo Li1

  • 1Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, People's Republic of China.

Nanotechnology
|March 17, 2022
PubMed
Summary

Researchers developed pH-responsive carbon quantum dots (Si-CDs) with high luminescence and tunable colors for bioimaging. These non-toxic, biocompatible Si-CDs offer a simple, cost-effective solution for biomedical applications and pH sensing.

Keywords:
biological imagingcarbon quantum dotshigh luminescencepH-responsivereversible

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Carbon quantum dots (CDs) are highly sought after for their unique properties and diverse applications.
  • Integrating high luminescence, biocompatibility, and tunable color emission in CDs for bioimaging remains a significant challenge.
  • Developing simple and efficient synthesis methods for advanced CDs is crucial.

Purpose of the Study:

  • To synthesize novel pH-responsive carbon quantum dots (Si-CDs) with enhanced luminescence and tunable optical properties.
  • To investigate the biocompatibility and chemical inertness of the synthesized Si-CDs for potential biomedical applications.
  • To explore the feasibility of using Si-CDs as pH-sensitive probes for bioimaging and sensing.

Main Methods:

  • Fabrication of Si-CDs using a one-step hydrothermal method.
  • Modification with (3-mercaptopropyl) triethoxysilane (KH-580) to impart pH responsiveness.
  • Characterization of optical properties, including luminescence quantum yield and pH-dependent color changes.
  • Evaluation of biocompatibility and chemical inertness through in vitro cell system simulation.

Main Results:

  • Successfully synthesized Si-CDs with a high luminescence quantum yield of 74.8%.
  • Demonstrated reversible and repeatable pH-responsive luminescence color transformation (green-blue-violet) by altering pH.
  • Confirmed good biocompatibility and chemical inertness of Si-CDs in simulated in vitro cell systems.
  • Achieved a simple, cost-effective, and environmentally friendly synthesis route.

Conclusions:

  • The developed Si-CDs exhibit excellent luminescence, pH-tunable color emission, and good biocompatibility.
  • These Si-CDs are promising candidates for advanced bioimaging applications and development of novel pH-sensitive sensors.
  • The one-step hydrothermal synthesis offers a practical and scalable approach for producing functional carbon quantum dots.