Plasmooptoelectronic tuning of optical properties and SERS response of ordered silver grating by free carrier generation

Kalachyova, Y.; Alkhimova, D.; Koštejn, Martin; Macháč, Petr; Švorčı́k, Václav; Lyutakov, Oleksiy

doi:10.1039/c5ra16263g

Cited by 6 publications

(9 citation statements)

References 29 publications

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“…Preparation of plasmon‐active gold gratings was performed according to a previously reported procedure . A schematic of the surface functionalization of the grating with PNIPAm is shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…Preparation of plasmon-activeg old gratings was performed according to apreviously reported procedure. [3,7,24,25] Aschematic of the surface functionalization of the grating with PNIPAm is shown in Figure 1. In the first step, the diazonium chemistry approachw as used for covalent graftingo fC 6 H 4 -COOH to the gold surface.…”

Section: Resultsmentioning

confidence: 99%

“…The prepared samples were dried at 50 °C for 24 h and irradiated by UV‐source for 30 min. After that, the UV‐irradiated samples were dried at 90 °C for 2 h. Pattering procedure of Su‐8 film was described in our previous works . Briefly, the flat polymer surface was patterned by KrF excimer laser (COMPexPro 50F, Coherent, Inc., wavelength 248 nm, pulse duration 20–40 ns, repetition rate 10 Hz).…”

Section: Methodsmentioning

confidence: 99%

“…Plasmonically active metal nanostructures have become a key element in a variety of scientific and technical fields . Their unique interaction with light enables the preparation of optically triggerable catalytic systems, extremely sensitive sensor platforms, and photonic modulators with unprecedented speed . Plasmon‐based sensors are especially favorable due to the extremely low detectable concentration and remarkable versatility of analyte molecules, varying from inorganic ions to biomolecules .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Their unique interaction with light enables the preparation of optically triggerablec atalytic systems, extremely sensitive sensor platforms,a nd photonic modulators with unprecedented speed. [4][5][6][7] Plasmon-based sensors are especially favorable due to the extremelyl ow detectable concentration and remarkable versatility of analyte molecules,v arying from inorganic ions to biomolecules. [8][9][10] Superposition of the electromagnetic field on the plasmon-active surfaceo fm etallic nanostructures can significantly amplify the Raman signal from the surrounding analyte.…”

Section: Introductionmentioning

confidence: 99%

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Large‐Scale, Ultrasensitive, Highly Reproducible and Reusable Smart SERS Platform Based on PNIPAm‐Grafted Gold Grating

et al. 2017

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A smart plasmonic sensor based on periodic gold gratings grafted with poly(N‐isopropyl acrylamide) (PNIPAm) has been designed and realized. A periodic gold structure was created on the polymer backing with an excimer laser (1×2 cm2 modified area) and was subsequently covered by thin gold film. In the next step, a 7 nm thick PNIPAm layer was grafted to the gold surface through a two‐step procedure: covalent attachment of 4‐carboxybenzil groups followed by carboxyl groups activation and their coupling with amino‐terminated PNIPAm. Surface properties of the prepared structure and their switchable behavior were investigated using refractometry, wettability measurements, AFM in water, cyclic voltammetry, and pH‐ and temperature‐dependent Z‐potential measurements. The structure enables effective entrapment and SERS detection of azo dyes, significant reduction of minimal detectable concentration of target molecules, and a detection limit down to femtomolar concentrations. Excitation of plasmons on the well‐ordered surface structure also gives excellent reproducibility for SERS along the particular sample surface and as well as on different samples. Additionally, the reversible switching of wettability under repeated temperature changes on the gold plasmonic platform allows multiple uses of the developed system.

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Section: Resultsmentioning

confidence: 99%