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Copper pattern on self-assembled monolayer through microcontact printing.

Zheng-Chun Liu1, Fei-Peng Yang, Xiao-Wen Xu

  • 1School of Info-Physics and Geomatics Engineering, Central South University, Changsha 410083, China.

Journal of Nanoscience and Nanotechnology
|April 3, 2010
PubMed
Summary
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This study demonstrates a novel method for creating copper (Cu) patterns on self-assembled monolayers (SAMs) using microcontact printing and electroless plating. This technique offers a precise way to fabricate microscale conductive patterns for electronic applications.

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Self-assembled monolayers (SAMs) are crucial for surface modification.
  • Microcontact printing offers precise patterning capabilities.
  • Electroless plating is a versatile method for metal deposition.

Purpose of the Study:

  • To develop a microcontact printing-based method for selective copper patterning on 3-mercaptopropyltrimethoxysilane (MPTS) SAMs.
  • To investigate the role of hydrophobic deactivation and silver nanoparticle activation in the patterning process.
  • To characterize the resulting copper patterns' microstructure and electrical properties.

Main Methods:

  • Modification of glass substrates with MPTS-SAMs.
  • Selective deactivation of MPTS-SAMs using microcontact printing of 1-hexadecanethiol.

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  • Activation of the patterned substrate with silver (Ag) colloids.
  • Electroless copper (Cu) plating to form the desired pattern.
  • Characterization using X-ray photoelectron spectroscopy (XPS), water contact angle, Scanning Electron Microscopy (SEM), and four-point probe measurements.

    • Main Results:

    • Selective deactivation of MPTS-SAMs was confirmed by XPS and contact angle measurements, attributed to disulfide bond formation.
    • Successful deposition of Ag particles on MPTS regions, forming S-Ag bonds, creating an ideal catalytic pattern.
    • Fabrication of high-resolution (10 microm) Cu patterns mirroring the silicon master.
    • Achieved an average electrical resistivity of 1.8 x 10^-6 omega cm for the Cu patterns.

    Conclusions:

    • Microcontact printing of deactivating agents on SAMs is a viable technique for preparing patterned copper.
    • The developed method enables precise fabrication of conductive microstructures.
    • This approach holds potential for applications in microelectronics and sensor development.