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Self-assembled monolayer-assisted negative lithography.

Xiaoyan Mu1, Aiting Gao, Dehui Wang

  • 1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710062, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 24, 2015
PubMed
Summary
This summary is machine-generated.

This study challenges the idea that ordered molecular packing improves etching resistance. It introduces a new method where ordered self-assembled monolayers (SAMs) etch faster, enabling flexible microfabrication.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Self-assembled monolayers (SAMs) are typically used as etching resists in lithography.
  • Ordered molecular packing in SAMs is conventionally believed to enhance etching resistance.

Purpose of the Study:

  • To challenge the established correlation between SAM order and etching resistance.
  • To introduce a novel SAM-assisted negative lithography technique.
  • To demonstrate flexible micro/nanofabrication capabilities.

Main Methods:

  • Utilizing OH-terminated SAMs on gold surfaces.
  • Employing a two-step process: UV irradiation through a photomask and etching in an aqueous solution.
  • Investigating the effect of irradiation time on pattern formation.

Main Results:

  • Ordered SAM regions were etched faster than disordered regions, contradicting conventional beliefs.
  • UV-exposed regions with disordered packing exhibited slower etching rates.
  • Pattern polarity (negative to positive) could be controlled by adjusting irradiation time.

Conclusions:

  • The study presents a new SAM-assisted negative lithography approach.
  • This method allows for the creation of both positive and negative micropatterns using a single SAM-modified surface.
  • Offers flexible, high-resolution micro/nanofabrication opportunities.