Wetting characteristics of ZnO smooth film and nanowire structure with and without OTS coating

Li Yu Lin, Hyun Joon Kim, Dae Eun Kim

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

ZnO is an important material that is used in a variety of technologies including optical devices, sensors, and other microsystems. In many of these technologies, wettability is of great concern because of its implications in numerous surface related interactions. In this work, the effects of surface morphology and surface energy on the wetting characteristics of ZnO were investigated. ZnO specimens were prepared in both smooth film and nanowire structure in order to investigate the effects of surface morphology. Also, a hydrophobic octadecyltrichlorosilane (OTS) coating was used to chemically modify the surface energy of the ZnO surface. Wettability of the surfaces was assessed by measuring the water contact angle. The results showed that the water contact angle varied significantly with surface morphology as well as surface energy. OTS coated ZnO nanowire specimen had the highest contact angle of 150°, which corresponded to a superhydrophobic surface. This was a drastic difference from the contact angle of 87° obtained for the smooth ZnO film specimen. In addition to the initial contact angle, the evolution of the water droplet with respect to time was investigated. The wetting state of water droplet was analyzed with both Wenzel and Cassie-Baxter models. Spontaneous and gradual spreading, together with evaporation phenomenon contributed to the changing shape, and hence the varying contact angle, of the water droplet over time.

Original languageEnglish
Pages (from-to)7370-7376
Number of pages7
JournalApplied Surface Science
Volume254
Issue number22
DOIs
Publication statusPublished - 2008 Sep 15

Fingerprint

Nanowires
Contact angle
Wetting
Coatings
Interfacial energy
Water
Surface morphology
Microsystems
Optical devices
octadecyltrichlorosilane
Evaporation
Sensors

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

@article{97e9b6a0ad0c4968bc9527a44ba7fdf7,
title = "Wetting characteristics of ZnO smooth film and nanowire structure with and without OTS coating",
abstract = "ZnO is an important material that is used in a variety of technologies including optical devices, sensors, and other microsystems. In many of these technologies, wettability is of great concern because of its implications in numerous surface related interactions. In this work, the effects of surface morphology and surface energy on the wetting characteristics of ZnO were investigated. ZnO specimens were prepared in both smooth film and nanowire structure in order to investigate the effects of surface morphology. Also, a hydrophobic octadecyltrichlorosilane (OTS) coating was used to chemically modify the surface energy of the ZnO surface. Wettability of the surfaces was assessed by measuring the water contact angle. The results showed that the water contact angle varied significantly with surface morphology as well as surface energy. OTS coated ZnO nanowire specimen had the highest contact angle of 150°, which corresponded to a superhydrophobic surface. This was a drastic difference from the contact angle of 87° obtained for the smooth ZnO film specimen. In addition to the initial contact angle, the evolution of the water droplet with respect to time was investigated. The wetting state of water droplet was analyzed with both Wenzel and Cassie-Baxter models. Spontaneous and gradual spreading, together with evaporation phenomenon contributed to the changing shape, and hence the varying contact angle, of the water droplet over time.",
author = "Lin, {Li Yu} and Kim, {Hyun Joon} and Kim, {Dae Eun}",
year = "2008",
month = "9",
day = "15",
doi = "10.1016/j.apsusc.2008.05.337",
language = "English",
volume = "254",
pages = "7370--7376",
journal = "Applied Surface Science",
issn = "0169-4332",
publisher = "Elsevier",
number = "22",

}

Wetting characteristics of ZnO smooth film and nanowire structure with and without OTS coating. / Lin, Li Yu; Kim, Hyun Joon; Kim, Dae Eun.

In: Applied Surface Science, Vol. 254, No. 22, 15.09.2008, p. 7370-7376.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Wetting characteristics of ZnO smooth film and nanowire structure with and without OTS coating

AU - Lin, Li Yu

AU - Kim, Hyun Joon

AU - Kim, Dae Eun

PY - 2008/9/15

Y1 - 2008/9/15

N2 - ZnO is an important material that is used in a variety of technologies including optical devices, sensors, and other microsystems. In many of these technologies, wettability is of great concern because of its implications in numerous surface related interactions. In this work, the effects of surface morphology and surface energy on the wetting characteristics of ZnO were investigated. ZnO specimens were prepared in both smooth film and nanowire structure in order to investigate the effects of surface morphology. Also, a hydrophobic octadecyltrichlorosilane (OTS) coating was used to chemically modify the surface energy of the ZnO surface. Wettability of the surfaces was assessed by measuring the water contact angle. The results showed that the water contact angle varied significantly with surface morphology as well as surface energy. OTS coated ZnO nanowire specimen had the highest contact angle of 150°, which corresponded to a superhydrophobic surface. This was a drastic difference from the contact angle of 87° obtained for the smooth ZnO film specimen. In addition to the initial contact angle, the evolution of the water droplet with respect to time was investigated. The wetting state of water droplet was analyzed with both Wenzel and Cassie-Baxter models. Spontaneous and gradual spreading, together with evaporation phenomenon contributed to the changing shape, and hence the varying contact angle, of the water droplet over time.

AB - ZnO is an important material that is used in a variety of technologies including optical devices, sensors, and other microsystems. In many of these technologies, wettability is of great concern because of its implications in numerous surface related interactions. In this work, the effects of surface morphology and surface energy on the wetting characteristics of ZnO were investigated. ZnO specimens were prepared in both smooth film and nanowire structure in order to investigate the effects of surface morphology. Also, a hydrophobic octadecyltrichlorosilane (OTS) coating was used to chemically modify the surface energy of the ZnO surface. Wettability of the surfaces was assessed by measuring the water contact angle. The results showed that the water contact angle varied significantly with surface morphology as well as surface energy. OTS coated ZnO nanowire specimen had the highest contact angle of 150°, which corresponded to a superhydrophobic surface. This was a drastic difference from the contact angle of 87° obtained for the smooth ZnO film specimen. In addition to the initial contact angle, the evolution of the water droplet with respect to time was investigated. The wetting state of water droplet was analyzed with both Wenzel and Cassie-Baxter models. Spontaneous and gradual spreading, together with evaporation phenomenon contributed to the changing shape, and hence the varying contact angle, of the water droplet over time.

UR - http://www.scopus.com/inward/record.url?scp=50549099056&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=50549099056&partnerID=8YFLogxK

U2 - 10.1016/j.apsusc.2008.05.337

DO - 10.1016/j.apsusc.2008.05.337

M3 - Article

AN - SCOPUS:50549099056

VL - 254

SP - 7370

EP - 7376

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

IS - 22

ER -