Full wetting of plasmonic nanopores through two-component droplets

Chang, Cheng Jen; Xu, Xiumei; Li, Yang; Jans, Hilde; Neutens, Pieter; Kerman, Sarp; Vereecke, Guy; Holsteyns, Frank; Maes, Guido; Lagae, Liesbet; Stakenborg, Tim; Dorpe, Pol Van

doi:10.1039/c5sc02338f

Cited by 12 publications

(10 citation statements)

References 50 publications

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“…Oxygen plasma process (5 min) was used to clean both topsides and bottom sides of all flow cells and nanoslit chips to avoid any possible contaminations. To completely wet the nanoslit, a droplet of mixture of isopropyl alcohol and water (1:1 in volume) was placed near the cavity, and the liquid can fill inside the slit through the Marangoni effect 54 . This was important to avoid trapping air bubbles inside the slits and thus can improve the reproducibility of experiments.…”

Section: Methodsmentioning

confidence: 99%

High spatial resolution nanoslit SERS for single-molecule nucleobase sensing

et al. 2018

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Solid-state nanopores promise a scalable platform for single-molecule DNA analysis. Direct, real-time identification of nucleobases in DNA strands is still limited by the sensitivity and the spatial resolution of established ionic sensing strategies. Here, we study a different but promising strategy based on optical spectroscopy. We use an optically engineered elongated nanopore structure, a plasmonic nanoslit, to locally enable single-molecule surface enhanced Raman spectroscopy (SERS). Combining SERS with nanopore fluidics facilitates both the electrokinetic capture of DNA analytes and their local identification through direct Raman spectroscopic fingerprinting of four nucleobases. By studying the stochastic fluctuation process of DNA analytes that are temporarily adsorbed inside the pores, we have observed asynchronous spectroscopic behavior of different nucleobases, both individual and incorporated in DNA strands. These results provide evidences for the single-molecule sensitivity and the sub-nanometer spatial resolution of plasmonic nanoslit SERS.

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Section: Methodsmentioning

confidence: 99%

High spatial resolution nanoslit SERS for single-molecule nucleobase sensing

et al. 2018

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“…9 In this context nanoporous films have been proposed as new platforms to investigate nanofluidics 1 and the related wettability issues. 10,11 As for the technological drive, whatever the application, the exploitation of nanoporous getter coatings ultimately relies on their capability to be infiltrated by a fluid. 12 Despite the demonstrated versatility and widespreading of porous thin films, measurements of their permeability remains an outstanding issue.…”

Section: Introductionmentioning

confidence: 99%

Photoacoustic Sensing of Trapped Fluids in Nanoporous Thin Films: Device Engineering and Sensing Scheme

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Gandolfi

Bael

et al. 2018

ACS Appl. Mater. Interfaces

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Accessing fluid infiltration in nanogranular coatings is an outstanding challenge, of relevance for applications ranging from nanomedicine to catalysis. A sensing platform, allowing quantifying the amount of fluid infiltrated in a nanogranular ultrathin coating, with thickness in the 10-40 nm range, is here proposed and theoretically investigated by multiscale modeling. The scheme relies on impulsive photoacoustic excitation of hypersonic mechanical breathing modes in engineered gas-phase-synthesized nanogranular metallic ultrathin films and time-resolved acousto-optical read-out of the breathing modes frequency shift upon liquid infiltration. A superior sensitivity, exceeding 26 × 10 cm/g, is predicted upon equivalent areal mass loading of a few ng/mm. The capability of the present scheme to discriminate among different infiltration patterns is discussed. The platform is an ideal tool to investigate nanofluidics in granular materials and naturally serves as a distributed nanogetter coating, integrating fluid sensing capabilities. The proposed scheme is readily extendable to other nanoscale and mesoscale porous materials.

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“…On the other hand, complete wetting of nanostructured surfaces is desired for applications from wet processing in integrated circuits (IC) fabrication 12−15 to single molecule detection in nanofluidics. 16,17 Consequently, establishing an in-depth understanding of the wetting behavior on nanostructured surfaces is critical. The most commonly used method to study solid− liquid interactions and superhydrophobic breakdown is based on goniometric techniques, that is, macroscopic contact angle measurements.…”

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confidence: 99%

Superhydrophobic Breakdown of Nanostructured Surfaces Characterized in Situ Using ATR–FTIR

et al. 2017

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In situ characterization of the underwater stability of superhydrophobic micro- and nanostructured surfaces is important for the development of self-cleaning and antifouling materials. In this work, we demonstrate a novel attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy-based method for large-area wetting characterization of silicon nanopillars. When air is present in between the structures, as is characteristic of the Cassie-Baxter state, the relative intensities of the water bands in the absorption spectrum change because of the wavelength-dependent attenuation of the evanescent wave. This phenomenon enables unambiguous identification of the wetting state and assessment of liquid impalement. Using mixtures of isopropanol and water with different concentrations, the breakdown of superhydrophobic states and the wetting hysteresis effects are systematically studied on uniform arrays of silicon nanopillars. A transition from the Cassie-Baxter to Wenzel state is observed when the isopropanol concentration exceeds 2.8 mol %, corresponding to a critical surface tension of 39 mN/m. Spontaneous dewetting does not occur upon decreasing the isopropanol concentration, and pure water can be obtained in a stable Wenzel state on the originally superhydrophobic substrates. The developed ATR-FTIR method can be promising for real-time monitoring of the wetting kinetics on nanostructured surfaces.

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Full wetting of plasmonic nanopores through two-component droplets

Abstract: By placing a drop of wine near the sub-10 nm gold nanopore to generate a Marangoni flow, we can finally overcome the wetting problem and make the nanopore perform excellently for molecular sensing in aqueous solutions.

Cited by 12 publications

References 50 publications

High spatial resolution nanoslit SERS for single-molecule nucleobase sensing

High spatial resolution nanoslit SERS for single-molecule nucleobase sensing

Photoacoustic Sensing of Trapped Fluids in Nanoporous Thin Films: Device Engineering and Sensing Scheme

Superhydrophobic Breakdown of Nanostructured Surfaces Characterized in Situ Using ATR–FTIR

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