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Probing Innovative Microfabricated Substrates for their Reproducible SERS Activity
Author(s) -
Cialla Dana,
Hübner Uwe,
Schneidewind Henrik,
Möller Robert,
Popp Jürgen
Publication year - 2008
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200700705
Subject(s) - nanodiamond , nanotechnology , materials science , raman spectroscopy , monolayer , fabrication , etching (microfabrication) , nanolithography , electron beam lithography , lithography , optoelectronics , resist , diamond , layer (electronics) , optics , medicine , physics , alternative medicine , pathology , composite material
New types of microfabricated surface‐enhanced Raman spectroscopy (SERS) active substrates produced by electron beam lithography and ion beam etching are introduced. In order to achieve large enhancement factors by using the lightning rod effect, we prepare arrays consisting of sharp‐edged nanostructures instead of the commonly used dots. Two experimental methods are used for fabrication: a one‐stage process, leading to gold nanostar arrays and a two‐stage process, leading to gold nanodiamond arrays. Our preparation process guarantees high reproducibility. The substrates contain a number of arrays for practical applications, each 200×200 μm 2 in size. To test the SERS activity of these nanostar and nanodiamond arrays, a monolayer of the dye crystal violet is used. Enhancement factors are estimated to be at least 130 for the nanodiamond and 310 for the nanostar arrays.