Open AccessIn‐situ seeding synthesis of walnut kernel‐like Ag nanostructures with highly efficient SERS performance
Author(s) -
Dong Lihong
Publication year - 2020
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2020.0131
Subject(s) - nanostructure , malachite green , materials science , seeding , nanotechnology , in situ , raman scattering , chemical engineering , raman spectroscopy , optics , chemistry , organic chemistry , physics , adsorption , engineering , aerospace engineering
By an in‐situ seeding synthetic route, with biocompatible reagents being used, walnut kernel‐like Ag nanostructures (Ag nanowalnuts) composed of nanoplates were fabricated. The in‐situ formation of seeds and introduction of complex [Ag 3 (C 6 H 5 O 7 ) n+1 ] 3n− were indispensable steps for this kind of self‐assembled nanostructure. The size of Ag nanowalnuts was in the range of 200–400 nm and the thickness of a single nanoplate was about 30 nm. The morphology of nanoplates was of variety, and their surface was bumpy. Such Ag nanostructures with rough surface and high curvature provided plenty of ‘hot spots’ on a single particle for surface‐enhanced Raman scattering (SERS) enhancement. Experimental results indicated that the Ag nanowalnuts offered great surface enhancement for 4‐mercaptobenzoic acid and malachite green molecules. The limit of detection was low to 10 −10 and 10 −8 M, respectively.