Layer-by-layer assembled gold nanoparticle films on amine-terminated substrates |
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Authors: | Zhang Fengxiang Srinivasan M P |
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Institution: | Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117576, Singapore. fx-zhang@imre.a-star.edu.sg |
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Abstract: | This work reports the fabrication and characterization of multilayered gold nanoparticle (AuNP) thin films on aminosilane functionalized substrates. The films are fabricated via layer-by-layer (LbL) assembly using as-synthesized, un-modified AuNPs and poly(allylamine hydrochloride) as the building blocks. While most literature reports that AuNP based LbL assemblies are constructed with a single interlayer binding force, this work shows that both coordination and electrostatic interaction are involved in the process of assembly based on X-ray photoelectron spectroscopic results. The stepwise film growth behavior is demonstrated by atomic force spectroscopy and UV-vis spectroscopy. It is found that the particles agglomerate with each other and form large clusters when the number of assembled layers increases. |
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