Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
권호 표지

Fabrication and properties of superhydrophobic $SiO_2$ thin film by sol-gel method

Sol-gel 법에 의한 초발수 $SiO_2$ 박막의 제조 및 특성

  • Kim, Jin-Ho (Korea Institute of Ceramic Engineering and Technology, Glass & Display Team) ;
  • Hwang, Jong-Hee (Korea Institute of Ceramic Engineering and Technology, Glass & Display Team) ;
  • Lim, Tae-Young (Korea Institute of Ceramic Engineering and Technology, Glass & Display Team) ;
  • Kim, Sae-Hoon (Department of Ceramic Engineering, Gangneung-Wonju National University)
  • 김진호 (한국세라믹기술원 유리 디스플레이팀) ;
  • 황종희 (한국세라믹기술원 유리 디스플레이팀) ;
  • 임태영 (한국세라믹기술원 유리 디스플레이팀) ;
  • 김세훈 (강릉-원주대학교 세라믹공학과)
  • Published : 2009.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

Superhydrophobic $SiO_2$ thin films were successfully fabricated on a glass substrate by sol-gel method. To fabricate $SiO_2$ thin film with a high roughness, $SiO_2$ nano particles were added into tetraethoxysilane (TEOS) solution. The prepared $SiO_2$ thin film without an addition of $SiO_2$ nano particles showed a very flat surface with ca. 1.27 nm of root mean square (RMS) roughness. Otherwise, the $SiO_2$ thin films fabricated by using coating solutions added $SiO_2$ nano particles of 1.0, 2.0 and 3.0 wt% showed a RMS roughness of ca. 44.10 nm, ca. 69.58 nm, ca. 80.66 nm, respectively. To modify the surfaces of $SiO_2$ thin films to hydrophobic surface, a hydrophobic treatment was carried out using a fluoroalkyltrimethoxysilane (FAS). The $SiO_2$ thin films with a high rough surface were changed from hydrophilic to hydrophobic surface after the FAS treatment. Especially, the prepared $SiO_2$ thin film with a RMS roughness of 80.66 nm showed a water contact angle of $163^{\circ}$.

초발수 $SiO_2$ 박막을 sol-gel법에 의해 유리 기판 위에 성공적으로 제조하였다. 높은 표면 조도를 갖는 $SiO_2$ 박막을 제조하기 위하여 tetraethoxysilane(TEOS) 용액에 $SiO_2$ 나노 입자들을 첨가하였다. $iO_2$ 입자를 첨가하지 않은 용액을 이용하여 제조한 코팅막은 RMS roughness가 1.27 nm의 매우 평평한 표면 구조를 나타낸 반면, $SiO_2$ 나노 입자들을 1.0, 2.0, 3.0 wt% 첨가한 용액을 이용하여 제조한 $SiO_2$ 박막의 RMS roughness는 44.10 nm, 69.58 nm, 80.66 nm로 측정되었다. 제조된 $SiO_2$ 박막의 표면을 소수성 표면으로 바꾸기 위하여 FAS 용액을 이용하여 발수 처리를 하였다. FAS 처리 이후 거친 표면구조를 갖는 $SiO_2$ 박막의 표면은 친수성에서 소수성으로 바뀌었고 특히, 80.66 nm의 RMS roughness를 갖는 박막은 $163^{\circ}$의 물 접촉각을 갖는 초발수 표면을 나타내었다.

Keywords

References

  1. A. Chen, A. Peng, K. Koczkur and B. Miller, "Superhydrophobic tin oxide nanoflowers", Chem. Commun. (2004) 1964 https://doi.org/10.1039/b407313d
  2. A. Nakajima, K. Abe, K. Hashimoto and T. Watanabe, "Preparation of hard super-hydrophobic films with visible light transmission", Thin Solid Films 376 (2000) 140 https://doi.org/10.1016/S0040-6090(00)01417-6
  3. Y. Xu, W.H. Fan, Z.H. Li, D. Wu and Y.H. Sun, "Antireflective silica thin films with super water repellence via a solgel process", Applied Optics 42 (2003) 108 https://doi.org/10.1364/AO.42.000108
  4. A.V. Rao, M.M. Kulkarni, D.P. Amalerkar and T. Seth, "Superhydrophobic silica aerogels based on methyltrimethoxysilane precursor", J. Non-Cryst. Solids 330 (2003) 187 https://doi.org/10.1016/j.jnoncrysol.2003.08.048
  5. H.M. Shang, Y. Wang, S.J. Limmer, T.P. Chou, K. Takahashi and G.Z. Cao, "Optically transparent superhydrophobic silica-based films", Thin Solid Films 472 (2005) 37 https://doi.org/10.1016/j.tsf.2004.06.087
  6. K.S. Hwang, J.H. Jeong, J.H. Ahn and B.H. Kim, "Hydrophilic/hydrophobic conversion of Ni-doped $TiO_2$ thin films on glass substrates", Ceramics International 32 (2006) 935 https://doi.org/10.1016/j.ceramint.2005.06.010
  7. S. Yamabi and H. Imai, "Growth conditions for wurtzite zinc oxide films in aqueous solutions", J. Mater. Chem. 12 (2002) 3773 https://doi.org/10.1039/b205384e
  8. V.R. Shinde, C.D. Lokhande, R.S. Mane and S.H. Han, "Hydrophobic and textured ZnO films deposited by chemical bath deposition: annealing effect", Appl. Surf. Sci. 245 (2005) 407 https://doi.org/10.1016/j.apsusc.2004.10.036
  9. P. Chrysicopoulou, D. Davazoglou, Chr. Trapalis and G. Kordas, "Optical properties of very thin (< 100 nm) solgel $TiO_2$", Thin Solid Films 323 (1998) 188 https://doi.org/10.1016/S0040-6090(97)01018-3
  10. B.S. Hong, J.H. Han, S.T. Kim, Y.J. Cho, M.S. Park, T. Dolukhanyan and C. Sung, "Endurable water-repellent glass for automobiles", Thin Solid Films 351 (1999) 274 https://doi.org/10.1016/S0040-6090(98)01794-5
  11. K.H. Yoon, J.W. Choi and D.H. Lee, "Characteristics of ZnO thin films deposited onto Al/Si substrates by r.f. magnetron sputtering", Thin Solid Films 302 (1997) 116 https://doi.org/10.1016/S0040-6090(96)09568-5
  12. K.S. Yeung and Y.W. Lam, "A simple chemical vapour deposition method for depositing thin TiO2 films", Thin Solids Films 109 (1983) 169 https://doi.org/10.1016/0040-6090(83)90136-0
  13. S. Yamabi and H. Imai, "Growth conditions for wurtzite zinc oxide films in aqueous solutions", J. Mater. Chem. 12 (2002) 3773 https://doi.org/10.1039/b205384e
  14. H.J. Jeong, D.K. Kim, S.B. Lee, S.H. Kwon and K. Kadono, "Preparation of water-repellent glass by sol-gel process using perfluoroalkylsilane and tetraethoxysilane", J. Colloid Interface Sci. 235 (2001) 130 https://doi.org/10.1006/jcis.2000.7313
  15. T.S. Lin, C.F. Wu and C.T. Hsieh, "Enhancement of water-repellent performance on functional coating by using the taguchi method", Surf. Coat. Technol. 200 (2006) 5253 https://doi.org/10.1016/j.surfcoat.2005.06.019