Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 15, Pages 11859-11863Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am503675x
Keywords
core-satellite; surface-enhanced Raman scattering (SERS); SERS hot spot; near-infrared probe; uniform SERS activity
Funding
- Pioneer Research Center Program through the National Research Foundation of Korea - Ministry of Science, ICT & Future Planning [2013-006163]
- Ministry of Health Welfare [HI13C-1299-010013]
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It is critical to create isotropic hot spots in developing a reproducible, homogeneous, and ultrasensitive SERS probe. Here, an Ag shell-Au satellite (Ag-Au SS) nanostructure composed of an Ag shell and surrounding Au nanoparticles was developed as a near-IR active SERS probe. The heterometallic shell-satellite structure based SERS probe produced intense and uniform SERS signals (SERS enhancement factor similar to 1.4 x 10(6) with 11% relative standard deviation) with high detectability (100% under current measurement condition) by 785 nm photoexcitation. This signal enhancement was independent of the laser polarizations, which reflects the isotropic feature of the SERS activity of Ag-Au SS from the three-dimensional (3D) distribution of SERS hot spots between the shell and the surrounding satellite particles. The Ag-Au SS nanostructure shows a great potential as a reproducible and quantifiable NIR SERS probe for in vivo targets.
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