Electron beam lithography-assisted fabrication of Au nano-dot array as a substrate of a correlated AFM and confocal Raman spectroscopy

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Title
Electron beam lithography-assisted fabrication of Au nano-dot array as a substrate of a correlated AFM and confocal Raman spectroscopy
Author(s)
S W Lee; Yong Beom Shin; K S Jeon; S M Jin; Y D Suh; S Kim; J J Lee; Min-Gon Kim
Bibliographic Citation
Ultramicroscopy, vol. 108, no. 10, pp. 1302-1306
Publication Year
2008
Abstract
This paper documents a study of an Au nano-dot array that was fabricated by electron beam lithography on a glass wafer. The patterns that had features of 100 nm dots in diameter with a 2-μm pitch comprised a total area of 200×200μm2. The dot-shaped Cr underlayer was open to the air after developing Poly(methyl methacrylate) (PMMA). When dipped into the Cr etchant, the exposed Cr layer was eliminated from the glass wafer in a short period of time. In order to ultimately fabricate the Ti/Au dot arrays, Ti and Au were deposited onto the arrays with a thickness of 2 and 40 nm, respectively. The lift-off procedure was carried out in the Cr etchant using sonication in order to completely remove the residual Cr/PMMA layer. The fabricated Au nano-dot array was then immersed in an Ag enhancing solution and then into an ethanol solution containing (N-(6-(Biotinamido)hexyl)-3′-(2′-pyridyldithio)-propionamide (Biotin-HPDP). The substrate was analyzed using a correlated atomic force microscopy (AFM) and confocal Raman spectroscopy. Through this procedure, position-dependent surface-enhanced Raman spectroscopy (SERS) signals could be obtained.
Keyword
Atomic force microscopyConfocal RamanElectron beamNanoparticleSurface-enhanced Raman scattering
ISSN
0304-3991
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/j.ultramic.2008.04.056
Type
Article
Appears in Collections:
Division of Biomaterials Research > Bionanotechnology Research Center > 1. Journal Articles
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