Control of superhydrophilicity/superhydrophobicity using silicon nanowires via electroless etching method and fluorine carbon coatings

Beom Seok Kim, Sangwoo Shin, Seung Jae Shin, Kyung Min Kim, Hyung Hee Cho

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Surface roughness is promotive of increasing their hydrophilicity or hydrophobicity to the extreme according to the intrinsic wettability determined by the surface free energy characteristics of a base substrate. Top-down etched silicon nanowires are used to create superhydrophilic surfaces based on the hemiwicking phenomenon. Using fluorine carbon coatings, surfaces are converted from superhydrophilic to superhydrophobic to maintain the Cassie-Baxter state stability by reducing the surface free energy to a quarter compared with intrinsic silicon. We present the robust criteria by controlling the height of the nanoscale structures as a design parameter and design guidelines for superhydrophilic and superhydrophobic conditions. The morphology of the silicon nanowires is used to demonstrate their critical height exceeds several hundred nanometers for superhydrophilicity, and surpasses a micrometer for superhydrophobicity. Especially, SiNWs fabricated with a height of more than a micrometer provide an effective means of maintaining superhydrophilic (<10°) long-term stability.

Original languageEnglish
Pages (from-to)10148-10156
Number of pages9
JournalLangmuir
Volume27
Issue number16
DOIs
Publication statusPublished - 2011 Aug 16

Fingerprint

Fluorine
Silicon
Nanowires
fluorine
Etching
nanowires
Carbon
etching
coatings
Coatings
carbon
silicon
Free energy
micrometers
free energy
Hydrophilicity
Hydrophobicity
hydrophobicity
wettability
Wetting

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Kim, Beom Seok ; Shin, Sangwoo ; Shin, Seung Jae ; Kim, Kyung Min ; Cho, Hyung Hee. / Control of superhydrophilicity/superhydrophobicity using silicon nanowires via electroless etching method and fluorine carbon coatings. In: Langmuir. 2011 ; Vol. 27, No. 16. pp. 10148-10156.
@article{3eed83b743ed4af38d03829e3ada6386,
title = "Control of superhydrophilicity/superhydrophobicity using silicon nanowires via electroless etching method and fluorine carbon coatings",
abstract = "Surface roughness is promotive of increasing their hydrophilicity or hydrophobicity to the extreme according to the intrinsic wettability determined by the surface free energy characteristics of a base substrate. Top-down etched silicon nanowires are used to create superhydrophilic surfaces based on the hemiwicking phenomenon. Using fluorine carbon coatings, surfaces are converted from superhydrophilic to superhydrophobic to maintain the Cassie-Baxter state stability by reducing the surface free energy to a quarter compared with intrinsic silicon. We present the robust criteria by controlling the height of the nanoscale structures as a design parameter and design guidelines for superhydrophilic and superhydrophobic conditions. The morphology of the silicon nanowires is used to demonstrate their critical height exceeds several hundred nanometers for superhydrophilicity, and surpasses a micrometer for superhydrophobicity. Especially, SiNWs fabricated with a height of more than a micrometer provide an effective means of maintaining superhydrophilic (<10°) long-term stability.",
author = "Kim, {Beom Seok} and Sangwoo Shin and Shin, {Seung Jae} and Kim, {Kyung Min} and Cho, {Hyung Hee}",
year = "2011",
month = "8",
day = "16",
doi = "10.1021/la200940j",
language = "English",
volume = "27",
pages = "10148--10156",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "16",

}

Control of superhydrophilicity/superhydrophobicity using silicon nanowires via electroless etching method and fluorine carbon coatings. / Kim, Beom Seok; Shin, Sangwoo; Shin, Seung Jae; Kim, Kyung Min; Cho, Hyung Hee.

In: Langmuir, Vol. 27, No. 16, 16.08.2011, p. 10148-10156.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Control of superhydrophilicity/superhydrophobicity using silicon nanowires via electroless etching method and fluorine carbon coatings

AU - Kim, Beom Seok

AU - Shin, Sangwoo

AU - Shin, Seung Jae

AU - Kim, Kyung Min

AU - Cho, Hyung Hee

PY - 2011/8/16

Y1 - 2011/8/16

N2 - Surface roughness is promotive of increasing their hydrophilicity or hydrophobicity to the extreme according to the intrinsic wettability determined by the surface free energy characteristics of a base substrate. Top-down etched silicon nanowires are used to create superhydrophilic surfaces based on the hemiwicking phenomenon. Using fluorine carbon coatings, surfaces are converted from superhydrophilic to superhydrophobic to maintain the Cassie-Baxter state stability by reducing the surface free energy to a quarter compared with intrinsic silicon. We present the robust criteria by controlling the height of the nanoscale structures as a design parameter and design guidelines for superhydrophilic and superhydrophobic conditions. The morphology of the silicon nanowires is used to demonstrate their critical height exceeds several hundred nanometers for superhydrophilicity, and surpasses a micrometer for superhydrophobicity. Especially, SiNWs fabricated with a height of more than a micrometer provide an effective means of maintaining superhydrophilic (<10°) long-term stability.

AB - Surface roughness is promotive of increasing their hydrophilicity or hydrophobicity to the extreme according to the intrinsic wettability determined by the surface free energy characteristics of a base substrate. Top-down etched silicon nanowires are used to create superhydrophilic surfaces based on the hemiwicking phenomenon. Using fluorine carbon coatings, surfaces are converted from superhydrophilic to superhydrophobic to maintain the Cassie-Baxter state stability by reducing the surface free energy to a quarter compared with intrinsic silicon. We present the robust criteria by controlling the height of the nanoscale structures as a design parameter and design guidelines for superhydrophilic and superhydrophobic conditions. The morphology of the silicon nanowires is used to demonstrate their critical height exceeds several hundred nanometers for superhydrophilicity, and surpasses a micrometer for superhydrophobicity. Especially, SiNWs fabricated with a height of more than a micrometer provide an effective means of maintaining superhydrophilic (<10°) long-term stability.

UR - http://www.scopus.com/inward/record.url?scp=80051487162&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80051487162&partnerID=8YFLogxK

U2 - 10.1021/la200940j

DO - 10.1021/la200940j

M3 - Article

C2 - 21728376

AN - SCOPUS:80051487162

VL - 27

SP - 10148

EP - 10156

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 16

ER -