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Aerosol Jet Printing Conductive 3D Microstructures from Graphene Without Post-Processing.

Brittany N Smith1, Peter Ballentine1, James L Doherty1

  • 1Electrical and Computer Engineering Department, Duke University, Durham, NC, 27708, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|November 10, 2023
PubMed
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This summary is machine-generated.

Aerosol jet printing creates 3D graphene microstructures without post-processing. This method enhances sensor sensitivity by nearly 2x when using graphene trusses, offering a viable path for advanced applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Additive Manufacturing

Background:

  • Three-dimensional (3D) graphene microstructures offer potential for high-capacity batteries and ultrasensitive sensors.
  • Existing fabrication methods often require structural supports and extensive post-processing, increasing cost and complexity.
  • Additive manufacturing presents a promising alternative for efficient microstructure fabrication.

Purpose of the Study:

  • To develop a post-processing-free method for creating 3D graphene microstructures using aerosol jet printing.
  • To investigate the performance of these microstructures in sensor applications.
  • To demonstrate the adaptability of aerosol jet printing for fabricating freestanding 3D graphene structures.

Main Methods:

  • Utilized aerosol jet printing with water as the sole solvent to fabricate 3D graphene microstructures.
Keywords:
3D graphene3D printingadditive manufacturingaerosol jet printinggraphenehumidity sensorsprinted microstructuresrecyclable electronics

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  • Assessed the conductivity of printed graphene pillars immediately after printing without annealing.
  • Integrated 3D graphene structures (pillars and trusses) into humidity sensors to evaluate their impact on performance.

    • Main Results:

    • Achieved immediate conductivity in printed graphene pillars, eliminating the need for high-temperature annealing.
    • Successfully printed freestanding graphene pillars at angles below 45°, demonstrating structural versatility.
    • Graphene trusses improved sensor sensitivity by nearly twofold, while simple pillars did not enhance performance.
    • Aerosol jet printing enables the creation of conductive 3D graphene microstructures without post-processing.

    Conclusions:

    • Aerosol jet printing is a viable technique for fabricating 3D graphene microstructures without post-processing.
    • Incorporating 3D graphene structures, particularly trusses, into sensor electrodes can significantly enhance sensitivity.
    • The topological design of microstructures plays a crucial role in optimizing sensor performance.