Ag shell-Au satellite hetero-nanostructure for ultra-sensitive, reproducible, and homogeneous NIR SERS activity
Hyejin Chang1, Homan Kang, Jin-Kyoung Yang
1Department of Chemistry Education, and §Interdisciplinary Program in Nano-Science and Technology, #School of Chemical and Biological Engineering, Seoul National University , Seoul 151-742, Republic of Korea.
Abstract:
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 ∼1.4 × 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.
More Related Videos
Related Concept Videos
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
Atomic Emission Spectroscopy: Instrumentation
Atomic Emission Spectroscopy: Lab
Nuclear Overhauser Enhancement (NOE)


