4 May 2012 Nanosensing platforms: physics, technology, and applications
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Novel nanotextured Au surfaces are presented with periodically self-aligned nanopyramid structures with precisely defined pitch that are closely packed with 2 nm separation gaps over large areas and form high-density (~1 km cm-2) arrays of hot-spot scattering sites ideally suited for surface-enhanced Raman scattering (SERS) and Raman spectroscopy. Average Raman enhancement factors from physically adsorbed rhodamine 6G on patterned Au surfaces resulted in EF~106. The Raman average EF has been characterized over large areas using benzenethiol monolayers chemisorbed on the Au nanopyramid surfaces. From the 1074 cm-1 ring mode of BT on surfaces with 200 nm pitch the EF=(0.8±0.04)×106, and for surfaces with 500 nm pitch the EF=(0.32±0.01)×107 from over 99% of the imaged area. Maximum EF>108 have been measured in both cases.
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Edwin T. Carlen, Songyue Chen, Mingliang Jin, Arpita De, Jan van Nieuwkasteele, Johan Bomer, "Nanosensing platforms: physics, technology, and applications", Proc. SPIE 8371, Sensing Technologies for Global Health, Military Medicine, Disaster Response, and Environmental Monitoring II; and Biometric Technology for Human Identification IX, 837110 (4 May 2012); doi: 10.1117/12.920540; https://doi.org/10.1117/12.920540

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