Nanopatterned surface with adjustable area coverage and feature size fabricated by photocatalysis

Yang Bai, Yan Zhang, Wei Li, Xuefeng Zhou, Changsong Wang, Xin Feng, Luzheng Zhang, Xiaohua Lu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We report an effective approach to fabricate nanopatterns of alkylsilane self-assembly monolayers (SAMs) with desirable coverage and feature size by gradient photocatalysis in TiO 2 aqueous suspension. Growth and photocatalytic degradation of octadecyltrichlorosilane (OTS) were combined to fabricate adjustable monolayered nanopatterns on mica sheet in this work. Systematic atomic force microscopy (AFM) analysis showed that OTS-SAMs that have similar area coverage with different feature sizes and similar feature size with different area coverages can be fabricated by this approach. Contact angle measurement was applied to confirm the gradually varied nanopatterns contributed to the gradient of UV light illumination. Since this approach is feasible for various organic SAMs and substrates, a versatile method was presented to prepare tunable nanopatterns with desirable area coverage and feature size in many applications, such as molecular and biomolecular recognition, sensor and electrode modification.

Original languageEnglish
Pages (from-to)9296-9300
Number of pages5
JournalApplied Surface Science
Issue number22
Publication statusPublished - 30 Aug 2009


  • Area coverage
  • Atomic force microscopy (AFM)
  • Feature size
  • Photocatalysis
  • Self-assembled monolayers (SAMs)


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