Fabrication of monodisperse asymmetric colloidal clusters by using Contact Area Lithography (CAL)

Changdeuck Bae, Jooho Moon, Hyunjung Shin, Jiyoung Kim, Myung M. Sung

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We report a new fabrication method of asymmetric colloidal clusters by using contact area lithography with site-selective growth. Nanometric surface patterns (∼44, 60, and 81 nm in diameter) were prepared by coating surfaces with self-assembled monolayers (SAMs; octadecyltrichlorosilane (OTS) in this study) except the contact area either between colloidal particles or between colloids and substrate. Nanoscale site-specific heterogeneous nucleation and growth of oxide materials of titanium were studied using the patterns of OTS-SAMs onto the either flat or curved surfaces of SiO2. Experimental results suggest that a combination of the large difference in the surface energy between the growing and surrounding surfaces and the diffusion-controlled growth leads to complete nanoscale site specificity. We also fabricated superstructrures of silica spheres with hemispheres of titania (<20 nm in dimension) on their surfaces and discussed the optical properties of colloidal films consisting of the monodisperse asymmetric colloidal clusters in terms of photonic band gap.

Original languageEnglish
Pages (from-to)14232-14239
Number of pages8
JournalJournal of the American Chemical Society
Volume129
Issue number46
DOIs
Publication statusPublished - 2007 Nov 21

Fingerprint

Lithography
Fabrication
Growth
Optics and Photonics
Colloids
Silicon Dioxide
Titanium
Photonic band gap
Self assembled monolayers
Interfacial energy
Oxides
Particles (particulate matter)
Nucleation
Optical properties
Silica
Coatings
Substrates
octadecyltrichlorosilane
titanium dioxide

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Bae, Changdeuck ; Moon, Jooho ; Shin, Hyunjung ; Kim, Jiyoung ; Sung, Myung M. / Fabrication of monodisperse asymmetric colloidal clusters by using Contact Area Lithography (CAL). In: Journal of the American Chemical Society. 2007 ; Vol. 129, No. 46. pp. 14232-14239.
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Fabrication of monodisperse asymmetric colloidal clusters by using Contact Area Lithography (CAL). / Bae, Changdeuck; Moon, Jooho; Shin, Hyunjung; Kim, Jiyoung; Sung, Myung M.

In: Journal of the American Chemical Society, Vol. 129, No. 46, 21.11.2007, p. 14232-14239.

Research output: Contribution to journalArticle

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