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Patterned carbon dot-based thin films for solid-state devices.

Apostolos Segkos1, Ilias Sakellis2, Nikolaos Boukos2

  • 1Institute of Nanoscience and Nanotechnology (INN), National Centre for Scientific Research "Demokritos", Patr. Gregoriou E & 27 Neapoleos Str., Aghia Paraskevi, 15341, Athens, Greece. a.segkos@inn.demokritos.gr and Department of Chemical Sciences, School of Chemical Engineering, NTUA, 15780 Athens, Greece.

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Summary

Researchers developed novel carbon dot nanocomposites for humidity sensors. These materials can be patterned for advanced optical and electrical devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Carbon dots (CDs) are fluorescent nanomaterials with tunable properties.
  • Developing robust and processable CD-based materials is crucial for device fabrication.
  • Existing methods for patterning CDs can be complex and limit device integration.

Purpose of the Study:

  • To synthesize novel carbon dot-based fluorescent nanocomposites.
  • To develop a method for patterning these nanocomposites for device fabrication.
  • To demonstrate the potential of patterned nanocomposites in solid-state devices, specifically a relative humidity sensor.

Main Methods:

  • Microwave-assisted thermal treatment of citric acid and urea to synthesize carbon dot nanocomposites.
  • Thin film deposition on SiO2 (100) substrates followed by annealing for dissolution resistance.
  • Optical lithography and O2 plasma etching for precise patterning of the nanocomposite films.
  • Spectroscopy and microscopy techniques for material characterization and process monitoring.

Main Results:

  • Successfully synthesized carbon dot-based fluorescent nanocomposite compounds.
  • Developed dissolution-resistant and processable thin films.
  • Achieved precise patterning of the nanocomposite films using optical lithography and O2 plasma etching.
  • Fabricated a solid-state relative humidity sensor on a SiO2 substrate.
  • Confirmed that patterned films retain functional groups, hydrophilicity, and photoluminescence (PL) properties.

Conclusions:

  • The developed carbon dot nanocomposites are suitable for patterning into functional thin films.
  • The fabrication process enables the creation of dissolution-resistant and processable patterned materials.
  • Patterned carbon dot nanocomposites are promising for the development of solid-state optical and electrical devices.
  • This work paves the way for advanced carbon dot-based sensor and device applications.