期刊
APPLIED SPECTROSCOPY
卷 65, 期 6, 页码 620-626出版社
SAGE PUBLICATIONS INC
DOI: 10.1366/10-06140
关键词
Core-shell nanoparticles; Gold nanoparticles; Au@SiO2; Au@Al2O3; Three dimensional finite-difference time-domain; 3D-FDTD; Au(111); Pt(111)
资金
- NSF of China [20703032, 11074210, 20973143]
- National Basic Research Program of China (973 Program) [2007CB815303, 2009CB930703]
We very recently reported a new spectroscopic application for expanding the versatility of surface Raman called shell-isolated nanoparticle-enhanced Raman spectroscopy or SHINERS. The most important and most difficult part of the SHINERS experiment is the effective transfer of the strong electromagnetic field from a gold core through the isolating silica or alumina shell to the probed surface. For this it is essential that the chemically inert dielectric shell be ultrathin (2-5 nm) yet pinhole-free. Herein we describe experimental and theoretical aspects of our SHINERS method in more detail. We provide a protocol for the synthesis and characterization of optimized shell-isolated nanoparticles (SHINs), and we examine the advantages of SHINERS nanoparticles over bare gold nanoparticles. We also present high-quality Raman spectra obtained from gold and platinum single-crystal surfaces in an electrochemical environment by our SHINERS technique. SHINERS is a simple and cost-effective approach that expands the flexibility of surface-enhanced Raman scattering (SERS) for an unprecedented diversity of applications in materials and surface sciences.
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