Hydrophobic recovery in ultrathin PDMS-coated long and short silicon nanowires

D. Ganta, C. Marry, J. Ma, S. Sinha

Research output: Contribution to journalArticlepeer-review


The ability to modify the contact angle (CA) of water on silicon has applications ranging from thermal management of electronics to miniaturized biomedical devices. Here, we report ∼30 ± 1° variation in superhydrophobic CA on silicon nanowires (NWs) coated with few nm of polydimethylsiloxane (PDMS), using a simple and stable plasma treatment. The variation in CA arises from choosing NWs of different lengths. We characterize the surfaces using a combination of X-ray photoelectron spectroscopy and other techniques. Together with CA available from similar treatment on bulk silicon, it is possible to non-lithographically create regions of diverse CA, from ∼5 to 149 ± 1°.

Original languageEnglish (US)
Pages (from-to)175-180
Number of pages6
JournalChemical Physics Letters
StatePublished - Mar 1 2016

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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