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

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

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38 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

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All Science Journal Classification (ASJC) codes

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

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