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Design and development of a coating device: Multiple-droplet drop-casting (MDDC-Alpha).

Dominikus Brian1, Morteza Eslamian1

  • 1University of Michigan-Shanghai Jiao Tong University Joint Institute, 800 Dongchuan Road, Minhang, Shanghai 200240, China.

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A new multiple-droplet drop-casting device enables large-area, patterned coatings for advanced materials like perovskites and carbon nanotubes. This scalable, low-cost technology minimizes waste and produces uniform films.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Developing scalable methods for depositing thin films is crucial for advanced material applications.
  • Current techniques often face limitations in area coverage, patterning capabilities, and material waste.

Purpose of the Study:

  • To develop and demonstrate a novel multiple-droplet drop-casting device for efficient, large-area, and patterned thin-film fabrication.
  • To assess the device's adaptability to various solution-processed materials and its performance characteristics.

Main Methods:

  • Utilized a multi-channel syringe pump for simultaneous or time-lagged droplet release (<10 ms).
  • Fabricated coatings up to ~100 cm² using carbon nanotube ink, graphene oxide ink, PEDOT:PSS, and perovskite solutions.
  • Investigated the influence of release height and film area on film properties.

Main Results:

  • Achieved reproducible and uniform films with micrometer thickness and ~1 μm roughness.
  • Demonstrated the device's scalability, low cost, and adaptability to diverse materials.
  • Confirmed the device's insensitivity to minor contaminations and its ability to minimize material waste.

Conclusions:

  • The developed multiple-droplet drop-casting device offers a versatile and efficient solution for fabricating large-area and patterned thin films.
  • This technology holds significant potential for applications in electronics, energy, and sensor technologies requiring solution-processed materials.