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Large scale synthesis of pinhole‐free shell‐isolated nanoparticles (SHINs) using improved atomic layer deposition (ALD) method for practical applications
Author(s) -
Zhang Wei,
Dong JinChao,
Li ChaoYu,
Chen Shu,
Zhan Chao,
Panneerselvam Rajapandiyan,
Yang ZhiLin,
Li JianFeng,
Zhou YongLiang
Publication year - 2015
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4760
Subject(s) - atomic layer deposition , nanoparticle , raman spectroscopy , nanotechnology , inert , silver nanoparticle , materials science , shell (structure) , transmission electron microscopy , layer (electronics) , deposition (geology) , coating , chemical engineering , chemistry , composite material , optics , physics , paleontology , organic chemistry , engineering , sediment , biology
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@Al 2 O 3 , Ag@SiO 2 and Ag@TiO 2 ) 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 © 2015 John Wiley & Sons, Ltd.