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Lei Qi

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Proceedings Article | 21 October 2009 Paper

In-situ formation of gold nanoparticles on self-assembly monolayer modified silicon substrate

Lei Qi, Chunxiao Chen, Shantang Liu

Proceedings Volume 7493, 749358 (2009) https://doi.org/10.1117/12.840177

KEYWORDS: Nanoparticles, Gold, Silicon, Particles, Quartz, Ions, Scanning electron microscopy, Spectroscopy, Atomic force microscopy, Solids

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We demonstrate an effective route for the in-situ chemical synthesis of gold nanoparticles on monolayer modified silicon substrate. The formation of gold nanoparticles is based on the ability of the amino groups of the monolayer to bind AuCl₄ ^- ions, followed by the reduction of AuCl₄ ^- to Au⁰ with NaBH4. The particles size can be controlled by the concentration of HAuCl₄ during the deposition-reduction process. By repeating the ion binding and reducing cycle, large amount of gold nanoparticles can be generated on the monolayer. UV visible spectroscopy and scanning electron microscope (SEM) confirm that the well-dispersed gold nanoparticles are formed on the substrate. From Atomic Force Microscope (AFM) images, we find the particles with characteristic of 3-35nm are generated on the monolayer. Therefore, this facile procedure can give a new choice to the formation of gold nanoparticles on the self-assembly monolayer modified silicon substrate.

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