Nanoporous Gold Nanoframes with Minimalistic Architectures:
Lower Porosity Generates Stronger Surface-Enhanced Raman Scattering
Capabilities
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Abstract
Current
synthesis of gold nanoframes has only demonstrated morphological
control over wall thickness and wall length. Here, we demonstrate
the ability to control the nanoscale porosity of these nanoframes,
using a templated seed-mediated approach. The porosity on these nanoporous
gold nanoframes (NGNs) is tuned by controlling the crystallite size
of Au nanoparticles deposited on the AgCl templates. The yield of
the NGNs approaches 100%. Despite its minimalist architectural construction,
the NGNs are mechanically robust, retaining its morphology even after
multiple centrifugation and sonication rounds. We further highlight
that decreasing the porosity on the NGN leads to improved surface-enhanced
Raman scattering (SERS) enhancement. Increasing the constituent Au
crystallite size decreases the porosity, but increases the surface
roughness of NGN, hence leading to greater SERS enhancement. The introduction
of porosity in a gold nanoframe structure through our synthesis method
is novel and generic, suggesting the extendibility of our method to
other types of templates