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Title: Synthesis of contiguous silica-gold core-shell structures: Critical parameters and processes
Authors: Phonthammachai, N.
Kah, J.C.Y. 
Jun, G.
Sheppard, C.J.R. 
Olivo, M.C.
Mhaisalkar, S.G.
White, T.J.
Issue Date: 6-May-2008
Citation: Phonthammachai, N., Kah, J.C.Y., Jun, G., Sheppard, C.J.R., Olivo, M.C., Mhaisalkar, S.G., White, T.J. (2008-05-06). Synthesis of contiguous silica-gold core-shell structures: Critical parameters and processes. Langmuir 24 (9) : 5109-5112. ScholarBank@NUS Repository.
Abstract: A direct process for preparing contiguous gold shells (15-25 nm thick) over amorphous silica spheres (200 nm) is described. In this method, gold seeds are synthesized from HAuCl4 in a dilute NaOH solution using deposition-precipitation with subsequent metallization by sodium borohydride (NaBH4). The ease of dispersing gold nanocrystals on spheres of bare silica and spheres after grafting with ammonia was studied as a function of pH (4-8), reaction temperature (65-96 °C), and time (5-30 min). Additional parameters requiring optimization included the quantity of NaBH4 and the HAuCl4 in K2CO3 solution to silica volume ratio. The evolution of gold nanocrystal growth was monitored by transmission electron microscopy, and the bathochromic shift of ultraviolet-visible absorption was correlated with shell perfection and thickness. © 2008 American Chemical Society.
Source Title: Langmuir
ISSN: 07437463
DOI: 10.1021/la703580r
Appears in Collections:Staff Publications

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