Combined Electrostatic-Covalent Building of Au NPs Multilayers and Their Size-Enhanced Cohesive and SERS Properties

<table>SERS spectra of methylene blue adsorbed 15 nm- and 5 nm-sized Au NPs multilayer structure (A). (black curve) 3 layers of 5 nm-sized gold nanoparticles hybrid architecture, (B). (red curve) monolayer of 15 nm-sized gold nanoparticles hybrid architecture.</table>

Advances in Physical Chemistry

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Figure 12

Figure 12: Combined Electrostatic-Covalent Building of Au NPs Multilayers and Their Size-Enhanced Cohesive and SERS Properties 