Seed-mediated growth of gold nanoparticles using self-assembled monolayer of polystyrene microspheres as nanotemplate arrays |
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| Authors: | Xiang Yan-Juan Wu Xiao-Chun Liu Dong-Fang Zhang Zeng-Xing Song Li Zhao Xiao-Wei Liu Li-Feng Luo Shu-Dong Ma Wen-Jun Shen Jun Zhou Wei-Y Zhou Jian-Jun Wang Chao-Ying and Wang Gang |
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| Affiliation: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Graduate School of the Chinese Academy of Sciences, Beijing 100080, China; National Center for Nanoscience and Nanotechnology, Beijing 100080, China |
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| Abstract: | Arrays of noble metal nanoparticles show potential applications in (bio-)sensing,
optical storage, surface-enhanced spectroscopy, and waveguides. For all such
potential devices, controlling the size, morphology, and interparticle spacing of
the nanoparticles is very important. Here, we combine seed-mediated growth with
nanosphere lithography to study the controllable growth of gold nanoparticles (Au
NPs), in which the self-assembly monolayer of polystyrene (PS) on a silicon surface
is used to guide the modification of alkanesilanes and the subsequent adsorption of
gold seeds; seed-mediated growth is applied to controlling the morphology and size
of Au NPs. The size of adsorption region (determining the number of adsorbed gold
seeds) is controlled by etching PS microspheres with oxygen plasma or annealing PS
microspheres at the glass transition temperature. The size and morphology of the Au
NPs are controlled by changing growth conditions. In such a way, we have achieved
the dual control of the obtained Au NPs. Preliminary results show that this strategy
holds a great promise. This approach can also be extended to a wide range of
materials and substrates. |
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| Keywords: | self-assembling polystyrene microspheres gold nanoparticles seed-mediated growth |
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