Microstructured polymer‐based substrates with broadband absorption for surface‐enhanced Raman scattering

Abstract

Large area (3 × 3 cm 2 ) substrates for surface-enhanced Raman scattering were fabricated by combining femtosecond laser microstructuring and soft lithography techniques. The fabrication procedure is as follows: (i) femtosecond laser machining is used to create a silicon master copy, (ii) replicates from polydimethylsiloxane are made, and (iii) a 50-nm-thick gold film is deposited on the surface of the replicates. The resulting substrates exhibit strongly enhanced absorption in the spectral region of 350 ∼ 1000 nm and generate enhanced Raman signal with enhancement factor of the order of 10 7 for 10 -6 M rhodamine 6G. The main advantages of our substrates are low cost, large active area, and possibility for mass replication.

Novel method for the production of SiC micro and nanopatterns

“…This is in good agreement with the general expectation that increasing roughness can be a powerful tool to increase the Raman scattering effect . [37][38][39][40]. The surface enhanced Raman peaks of the R6G on our gold-coated 3D patterned samples, which contains SiC, C having high resistance against chemical attacks offers the possibility for high sensitivity sensors operating in harsh environment and due to the biocompatibility of SiC for detection of biomolecules, as well.…”

A primary SERS-active interconnected Si-nanocore network for biomolecule detection with plasmonic nanosatellites as a secondary boosting mechanism

“…Similar observations of broadband absorption leading to signicant increases in SERS activity of R6G on gold lms coated on silicon microstructures. 33 In addition, the observed increased absorption of photons could potentially allow for an increased in the transference of charge between both the Si nanocores and plasmonic nanosatellites to a molecular analyte. 34,35 It is evident that the nanosatellite boosting mechanism has a profound effect on the Raman spectra.…”

Recent advances in linear and nonlinear Raman spectroscopy. Part VIII

“…The resulting substrates exhibit strongly enhanced absorption in the spectral region of 350 ∼ 1000 nm and generate enhanced Raman intensity by a factor of the order of 10 7 for 10 À6 M rhodamine 6G. [22] Yu et al describe metal-organic frameworks as a novel SERS substrate. Without the aid of any metal colloids or enhancing agents, the SERS signals of methyl orange adsorbed on metal-organic frameworks were observed and even remained active if the organic linkers of the metal frameworks were completely removed by high-temperature plasma treatments.…”

“…Yang and coworkers report details of microstructured polymer‐based substrates with broadband absorption for SERS. The resulting substrates exhibit strongly enhanced absorption in the spectral region of 350 ∼ 1000 nm and generate enhanced Raman intensity by a factor of the order of 10 7 for 10 −6 M rhodamine 6G . Yu et al describe metal‐organic frameworks as a novel SERS substrate.…”