Self-Assembled Plasmonic Pyramids from Anisotropic Nanoparticles for High-Efficient SERS

Yang, Wenjuan; Jye, Kae; Guo, Peng; Dong, Dashen; Sikdar, Debabrata; Premaratne, Malin; Cheng, Wenlong

doi:10.1007/s41664-017-0033-5

Cited by 7 publications

(6 citation statements)

References 54 publications

(68 reference statements)

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“…4-NTP molecules were self-assembled on the surface of the deposited nanoflowers. Plasmonic nanostructures such as the nanoflowers were reported to exhibit a high SERS enhancement owing to their tips, at which the electric field and therefore Raman scattering is enhanced 32–36 . The high signal enhancement enables monitoring of the plasmon-driven dimerization of 4-NTP on both the Stokes and the anti-Stokes spectral range in real time as the reaction proceeds.…”

Section: Resultsmentioning

confidence: 99%

The importance of plasmonic heating for the plasmon-driven photodimerization of 4-nitrothiophenol

Sarhan

Koopman

Schuetz

et al. 2019

Sci Rep

112

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Metal nanoparticles form potent nanoreactors, driven by the optical generation of energetic electrons and nanoscale heat. The relative influence of these two factors on nanoscale chemistry is strongly debated. This article discusses the temperature dependence of the dimerization of 4-nitrothiophenol (4-NTP) into 4,4′-dimercaptoazobenzene (DMAB) adsorbed on gold nanoflowers by Surface-Enhanced Raman Scattering (SERS). Raman thermometry shows a significant optical heating of the particles. The ratio of the Stokes and the anti-Stokes Raman signal moreover demonstrates that the molecular temperature during the reaction rises beyond the average crystal lattice temperature of the plasmonic particles. The product bands have an even higher temperature than reactant bands, which suggests that the reaction proceeds preferentially at thermal hot spots. In addition, kinetic measurements of the reaction during external heating of the reaction environment yield a considerable rise of the reaction rate with temperature. Despite this significant heating effects, a comparison of SERS spectra recorded after heating the sample by an external heater to spectra recorded after prolonged illumination shows that the reaction is strictly photo-driven. While in both cases the temperature increase is comparable, the dimerization occurs only in the presence of light. Intensity dependent measurements at fixed temperatures confirm this finding.

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Section: Resultsmentioning

confidence: 99%

The importance of plasmonic heating for the plasmon-driven photodimerization of 4-nitrothiophenol

Sarhan

Koopman

Schuetz

et al. 2019

Sci Rep

112

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“…Some studies have shown good SERS performance on microarrays of plasmonic nanostructures formed on hydrophobic polydimethylsiloxane (PDMS) substrates. However, PDMS is not a suitable substrate material for Leidenfrost evaporation due to its poor thermal conductivity. − As such, our SERS substrates based on Si-CNT hierarchical plasmonic micro-/nanostructures satisfy the above two requirements. The conventional Leidenfrost effect can induce the Wenzel-to-Cassie transition on the engineered surfaces in two steps.…”

Section: Resultsmentioning

confidence: 99%

Partial Leidenfrost Evaporation-Assisted Ultrasensitive Surface-Enhanced Raman Spectroscopy in a Janus Water Droplet on Hierarchical Plasmonic Micro-/Nanostructures

et al. 2020

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The conventional methods of creating superhydrophobic surface-enhanced Raman spectroscopy (SERS) devices are by conformally coating a nanolayer of hydrophobic materials on micro-/nanostructured plasmonic substrates. However, the hydrophobic coating may partially block hot spots and therefore compromise Raman signals of analytes. In this paper, we report a partial Leidenfrost evaporation-assisted approach for ultrasensitive SERS detection of low-concentration analytes in water droplets on hierarchical plasmonic micro-/ nanostructures, which are fabricated by integrating nanolaminated metal nanoantennas on carbon nanotube (CNT)decorated Si micropillar arrays. In comparison with natural evaporation, partial Leidenfrost-assisted evaporation on the hierarchical surfaces can provide a levitating force to maintain the water-based analyte droplet in the Cassie−Wenzel hybrid state, i.e., a Janus droplet. By overcoming the diffusion limit in SERS measurements, the continuous shrinking circumferential rim of the droplet, which is in the Cassie state, toward the pinned central region of the droplet, which is in the Wenzel state, results in a fast concentration of dilute analyte molecules on a significantly reduced footprint within several minutes. Here, we demonstrate that a partial Leidenfrost droplet on the hierarchical plasmonic surfaces can reduce the final deposition footprint of analytes by 3−4 orders of magnitude and enable SERS detection of nanomolar analytes (10 −9 M) in an aqueous solution. In particular, this type of hierarchical plasmonic surface has densely packed plasmonic hot spots with SERS enhancement factors (EFs) exceeding 10 7 . Partial Leidenfrost evaporation-assisted SERS sensing on hierarchical plasmonic micro-/nanostructures provides a fast and ultrasensitive biochemical detection strategy without the need for additional surface modifications and chemical treatments.

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“…To make full use of the merits of the 3D structure, SERS substrates based on 2D materials and metal nanoparticles have been combined and proposed . In these 3D SERS substrates, the 3D structure can fully utilize the 3D focal volume of the incident beam and increase the density of the metal nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Constructing 3D and Flexible Plasmonic Structure for High‐Performance SERS Application

et al. 2018

Adv Materials Technologies

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provide more hot spots, which are introduced by the electromagnetic mechanism (EM). By the virtue of their larger specific surface area and periodic structure, 3D SERS substrates can effectively amplify the optical field around metal nanoparticles (NPs), thereby enhancing the Raman signal. Moreover, the 3D structure of these substrates is beneficial for the enrichment of probe molecules around metal nanoparticles; as a result, one can still obtain a high Raman signal, even under an ultralow concentration. Consequently, an increasing number of researchers are now focusing on the design and fabrication of 3D SERS substrates.To make full use of the merits of the 3D structure, SERS substrates based on 2D materials and metal nanoparticles have been combined and proposed. [23,24] In these 3D SERS substrates, the 3D structure can fully utilize the 3D focal volume of the incident beam and increase the density of the metal nanoparticles. Furthermore, introduction of the 2D material can act as an atomically thick SERS substrate, [25] perfect absorbent layer of molecules, [26] excellent sub-nanometer spacer, [27] and passivation layer for metal, [28,29] and introduce enhancements via a chemical mechanism (CM). Previously, a 3D SERS substrate based on graphene covering a pyramid-shaped Au structure was reported to achieve high enhancement. [30] While the integration of graphene and pyramid-shaped Au was successfully implemented, this 3D SERS substrate was not flexible and did not meet with the requirements when detecting probe molecules on an arbitrary curvilinear surface.Therefore, transformation of these stiff 3D substrates into flexible structures via using various methods has been investigated extensively. Leem et al. reported 3D crumpled graphene-AuNPs hybrid structures for SERS applications using a mechanical self-assembly strategy on a thermally activated polymer. [31] Similarly, Lee et al. fabricated a rippled graphene structure on a polystyrene substrate using a thermal rippling process and demonstrated the increased plasmonic coupling and higher density of the hot spots on the rippled nanostructure. [32] Kumar et al. presented a flexible SERS sensor by depositing Ag on structured polydimethylsiloxane using a Taro leaf as the template and achieved highly sensitive detection for malachite green. [33] Moreover, to fabricate a flexible 3D SERS substrate, the transfer printing technique, [34] shadow Substrate design has attracted much interest in development of an effective surface enhanced Raman scattering (SERS) sensor. A flexible SERS substrate with excellent performance needs to be sensitive to details of the preparation process; this sensitivity represents a significant challenge for practical applications as opposed to laboratory research applications. Here, a 3D flexible plasmonic structure, AgNPs@MoS 2 /pyramidal polymer (polymethyl methacrylate), is fabricated using a simple and lowcost method. Using experiments and theoretical simulations, the SERS performance of the proposed substrate is assessed in terms of ...

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Self-Assembled Plasmonic Pyramids from Anisotropic Nanoparticles for High-Efficient SERS

Cited by 7 publications

References 54 publications

The importance of plasmonic heating for the plasmon-driven photodimerization of 4-nitrothiophenol

The importance of plasmonic heating for the plasmon-driven photodimerization of 4-nitrothiophenol

Partial Leidenfrost Evaporation-Assisted Ultrasensitive Surface-Enhanced Raman Spectroscopy in a Janus Water Droplet on Hierarchical Plasmonic Micro-/Nanostructures

Constructing 3D and Flexible Plasmonic Structure for High‐Performance SERS Application

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