[Supporting Information]
Optical properties of noncontinuous gold
shell engineered on silica mesosphere
Longkun Yang,ab Zhipeng Li,*a Peijie Wang,a Lisheng Zhang,a and Yan Fang*a
a
Beijing Key Laboratory for Nano-Photonics and Nano-Structure (NPNS),
Department of Physics, Capital Normal University, Beijing, 100048, China
b
Department of Chemistry, Hong Kong University of Science and Technology,
Clear Water Bay, Kowloon, Hong Kong, China
E-mail: zpli@cnu.edu.cn, fangyan@cnu.edu.cn
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The preparation of growth solution
In a reaction flask, 0.05 g K2CO3 was dissolved in 196.5 ml water. After stirred 10 min, 3.5
ml of 25 mM HAuCl4 was added. The mixture was initially light yellow and slowly became
colorless after stirred 20 min, indicating the formation of gold hydroxide. The resulting
solution was aged for at least 24 h in the dark before it was used [1].
Fig. S1 The FESEM image of silica mesospheres. The average diameter is about 360 nm.
Fig. S2 The TEM image of gold seeds.
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Fig. S3 The TEM image of gold seeds sprinkled silica mesosphere. The inset shows the magnified
image of it. The gold seeds are sprinkled on the surface of silica mesosphere uniformly.
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Fig. S4 The calculation details for gold particles coverage on the surface of silica spheres from
particle P I to P IV. (i) The targeted noncontinuous particulate gold nanoshells. (ii) The magnified
images of the corresponding nanoshells surface morphology. (iii) The images of gold coverage
calculated by the Micro-Image Analysis software.
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Fig. S5 The four targeted shells are illumilated one by one using unpolarized light from a halogen
lamp through Dark feild condenser (NA=1.4). The scattered light are collected through the
objective (×40, NA=0.6). (A) The carbon coated copper coodination grid. (B) The location of the
four targeted particulate shells under TEM and the corresphonding Dark field images. (C) The
magnified TEM images of the four target shells.
Reference
1.
Kim JH, Bryan WW, Randall Lee T (2008) Preparation, Characterization, and Optical
Properties of Gold, Silver, and Gold−Silver Alloy Nanoshells Having Silica Cores. Langmuir
24:11147-11152
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