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Title: A chemical route to increase hot spots on silver nanowires for surface-enhanced Raman spectroscopy application
Authors: Tan, Joel Min Rui
Goh, Madeline Shuhua
Lee, Yih Hong
Pedireddy, Srikanth
Phang, In Yee
Tjiu, Weng Weei
Ling, Xing Yi
Keywords: DRNTU::Science::Chemistry
Issue Date: 2012
Series/Report no.: Langmuir
Abstract: The effective number of surface-enhanced Raman spectroscopy (SERS) active hot spots on plasmonic nanostructures is the most crucial factor in ensuring high sensitivity in SERS sensing platform. Here we demonstrate a chemical etching method to increase the surface roughness of one-dimensional Ag nanowires, targeted at creating more SERS active hot spots along Ag nanowire’s longitudinal axis for increased SERS detection sensitivity. Silver nanowires were first synthesized by the conventional polyol method and then subjected to chemical etching by NH4OH and H2O2 mixture. The surfaces of silver nanowires were anisotropically etched off to create miniature “beads on a string” features with increased surface roughness while their crystallinity was preserved. Mapping of single-nanowire SERS measurements showed that the chemical etching method has overcome the limitation of conventional one-dimensional Ag nanowires with limited SERS active area at the tips to produce etched Ag nanowires with an increase in Raman hot spots and polarization-independent SERS signals across tens of micrometers length scale.
DOI: 10.1021/la302795r
Rights: © 2012 American Chemical Society.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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