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

<table>SERS spectra of methylene blue adsorbed on a 15 nm-sized NPs multilayer structure and a thermally evaporated Au film; (a) (blue curve) thermally evaporated Au film, (b) (green curve) five layers of gold nanoparticles multilayer architecture.</table>

Advances in Physical Chemistry

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Figure 10

Figure 10: Combined Electrostatic-Covalent Building of Au NPs Multilayers and Their Size-Enhanced Cohesive and SERS Properties 