Revisiting semicontinuous silver films as surface-enhanced Raman spectroscopy substrates

Surface-enhanced Raman spectroscopy (SERS) is a very promising analytical technique for the detection and identification of trace amounts of analytes. Among the many substrates used in SERS of great interest are nanostructures fabricated using physical methods, such as semicontinuous metal films obt...

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Bibliographic Details
Published in:Beilstein journal of nanotechnology 2019, Vol.10 (1), p.1048-1055
Main Authors: Liszewska, Malwina, Budner, Bogusław, Norek, Małgorzata, Jankiewicz, Bartłomiej J, Nyga, Piotr
Format: Article
Language:English
Subjects:
Electron beams
Electron-beam physical vapor deposition
Full Research Paper
Glass substrates
Metal films
metal island film
Morphology
Nanoscience
Nanotechnology
Optical properties
Percolation
Physical vapor deposition
plasmon resonance
Raman spectroscopy
semicontinuous silver film
SERS
Silver
Substrates
surface-enhanced Raman spectroscopy
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Summary:Surface-enhanced Raman spectroscopy (SERS) is a very promising analytical technique for the detection and identification of trace amounts of analytes. Among the many substrates used in SERS of great interest are nanostructures fabricated using physical methods, such as semicontinuous metal films obtained via electron beam physical vapor deposition. In these studies, we investigate the influence of morphology of semicontinuous silver films on their SERS properties. The morphologies studied ranged from isolated particles through percolated films to almost continuous films. We found that films below the percolation threshold (transition from dielectric-like to metal-like) made of isolated silver structures provided the largest SERS enhancement of 4-aminothiophenol (4-ATP) analyte signals. The substrate closest to the percolation threshold has the SERS signal about four times lower than the highest signal sample.
ISSN:2190-4286
2190-4286
DOI:10.3762/BJNANO.10.105