Biomimetic coating of gold nanoparticles with ultrathin silica layers

Sung Min Kang, Bang Sook Lee, Sang gi Lee, Insung S. Choi

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Encapsulation of nanoparticles has attracted a great attention as a method for stabilizing nanoparticles and subsequently applying them to various areas of technologies. Especially, the encapsulation of nanoparticles with silica shells has proven advantageous for applications to (nano)biotechnology with the well-established silica chemistry. However, current chemical approaches to the formation of silica shells generally require harsh conditions. In contrast, biological processes are capable of generating silica nano/microstructures under ambient conditions. In this work, we formed ultrathin (∼1.5 nm) silica shell-coated nanomaterials by mimicking the biological processes. The procedure consists of simple two steps: immobilization of a thiol-terminated imidazolium ion onto gold nanoparticles (AuNPs) and biomimetic polycondensation of silicic acids. The resulting AuNP/silica hybrids were characterized by Fourier-transform infrared spectroscopy, transmission electron microscopy, and UV-vis spectroscopy.

Original languageEnglish
Pages (from-to)150-153
Number of pages4
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
StatePublished - 1 Feb 2008

Bibliographical note

Funding Information:
This work was supported by the National R&D Project for Nano Science and Technology (I.S.C) and Basic Research Program (R01-2006-000-10426-0) from KOSEF (S.-g.L.). FT-IR spectrophotometer was purchased by a research fund from the Center for Molecular Design and Synthesis.


  • Biosilicification
  • Gold nanoparticle
  • Silica shell


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