High-Density Periodic Arrays of Self-Aligned Subwavelength Nanopyramids for Surface-Enhanced Raman Spectroscopy

Jin, Mingliang and Pully, Vishnu and Otto, Cees and Berg van den, Albert and Carlen, Edwin T. (2010) High-Density Periodic Arrays of Self-Aligned Subwavelength Nanopyramids for Surface-Enhanced Raman Spectroscopy. Journal of Physical Chemistry C: Nanomaterials and interfaces, 114 (50). pp. 21953-21959. ISSN 1932-7447

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Abstract:	Novel nanotextured surfaces are presented with periodically self-aligned subwavelength nanogroove and nanopyramid structures with precisely defined pitch lambda(g) that are closely packed with 2 nm separation gaps over large areas and form high-density arrays of hot-spot scattering sites ideally suited for surface-enhanced Raman scattering (SERS) and Raman spectroscopy. The simple self-aligning fabrication technique requires only a single lithography step and wet anisotropic etching. Measured average Raman enhancement factors of G approximate to 10(6) from rhodamine 60 (R6G) on patterned Au surfaces with lambda(g) = 200 nm are consistent with numerical calculations. The nanostructured surfaces can be scaled to smaller dimensions, which results in increased enhancement as well as increased hot-spot spatial density.
Item Type:	Article
Copyright:	© 2010 American Chemical Society
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS) Science and Technology (TNW)
Research Group:	Biomedical and Environmental Sensor systems (BIOS) Medical Cell BioPhysics (MCBP)
Link to this item:	http://purl.utwente.nl/publications/75885
Official URL:	http://dx.doi.org/10.1021/jp106245a
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