Porous gold nanodisks with multiple internal hot spots.
For increasing the number of internal hot spots in the individual plasmonic nanoparticles, porous Au nanostructures were synthesized by a hybrid approach combining a physical process, which defined the overall shapes and dimensions of the nanostructures, and a chemical process, which incorporated nanopores inside the patterned nanostructures. This approach allows us to synthesize lithographically designed Au nanodisks containing numerous internal Raman hot spots in the form of nanopores. The increased number of hot spots successfully improved SERS intensity, and this experimental result was further elucidated by numerical electromagnetic simulations. The highly improved and homogeneous SERS intensities illustrate the great potential of the porous plasmonic nanodisks as a sensitive molecular imaging agent.
International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. wi.jungsub@gmail.com
Jung-Sub
JS
Wi
Satoshi
S
Tominaka
Kohei
K
Uosaki
Tadaaki
T
Nagao
D006046:Gold / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D016062:Porosity; D013059:Spectrum Analysis, Raman / Q000379:methods
D006046:Gold