Journal
JOURNAL OF RAMAN SPECTROSCOPY
Volume 46, Issue 12, Pages 1200-1204Publisher
WILEY
DOI: 10.1002/jrs.4760
Keywords
surface-enhanced Raman spectroscopy; shell-isolated nanoparticle-enhanced Raman spectroscopy; core-shell nanostructures; atomic layer deposition; Ag@Al2O3
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Funding
- Ministry of Science and Technology (MOST) of China [2010IM040100]
- National Science Foundation of China [91123002]
- Thousand Youth Talents Plan of China
- Fundamental Research Funds for Xiamen University
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Shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) as a new member of Raman technique garnered great attention among scientific community. In this work, we used an improved experimental setup to float the bare silver nanoparticles in air with the help of extraneous airflow, and used atomic layer deposition (ALD) method to coat ultra-thin inert shell without pinholes. Under optimal conditions, we successfully prepared three kinds of SHINERS NPs (Ag@Al2O3, Ag@SiO2 and Ag@TiO2) in large quantity without pinholes. The ultra-thin inert shell maintains the SERS activity of silver nanoparticles for long period of time. Transmission electron microscopy (TEM) images confirm the uniform coating of shell material on silver nanoparticles. Finally, the as-prepared SHINs have been applied to detect various samples to demonstrate the applications. The presented ALD method offers a unique way to coat ultrathin shell (1-10 nm) on metal nanoparticles in large quantity (1-10 g) for practical applications. Copyright (c) 2015 John Wiley & Sons, Ltd.
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