Nanoporous FePd alloy as multifunctional ferromagnetic SERS-active substrate

Cialone, Matteo; Celegato, Federica; Scaglione, Federico; Barrera, Gabriele; Raj, Deepti; Coı̈sson, M.; Tiberto, P.; Rizzi, Paola

doi:10.1016/j.apsusc.2020.148759

Cited by 16 publications

(14 citation statements)

References 56 publications

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“…However, several other metals have been explored as the primary material for nanoporous structure fabrications. Depending on the fabrication method, copper, aluminum, nickel, titanium, iron, palladium, and platinum have been reported as NPMs. , In particular, copper has been extensively investigated as nanoporous metal and, compared to gold and silver, it is inexpensive and naturally abundant. Recently, several papers reported on the plasmonic properties and applications of copper structures for various purposes. ,,, Regarding nanoporous Cu, the investigations have been mainly focused on applications such as electrochemistry and catalysis. − On the contrary, the plasmonic properties of Cu and Cu nanoparticles have been reported by several authors and can be considered as the basis to explore the plasmonic behavior of nanoporous Cu film .…”

Section: Preparation Strategies and Plasmonic Properties Of Nanoporou...mentioning

confidence: 99%

“…Depending on the fabrication method, copper, aluminum, nickel, titanium, iron, palladium, and platinum have been reported as NPMs. 26,109 In particular, copper has been extensively investigated as nanoporous metal and, compared to gold and silver, it is inexpensive and naturally abundant. Recently, several papers reported on the plasmonic properties and applications of copper structures for various purposes.…”

Section: Preparation Strategies and Plasmonic Properties Of Nanoporou...mentioning

confidence: 99%

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Nanoporous Metals: From Plasmonic Properties to Applications in Enhanced Spectroscopy and Photocatalysis

et al. 2021

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The field of plasmonics is capable of enabling interesting applications in different wavelength ranges, spanning from the ultraviolet up to the infrared. The choice of plasmonic material and how the material is nanostructured has significant implications for ultimate performance of any plasmonic device. Artificially designed nanoporous metals (NPMs) have interesting material properties including large specific surface area, distinctive optical properties, high electrical conductivity, and reduced stiffness, implying their potentials for many applications. This paper reviews the wide range of available nanoporous metals (such as Au, Ag, Cu, Al, Mg, and Pt), mainly focusing on their properties as plasmonic materials. While extensive reports on the use and characterization of NPMs exist, a detailed discussion on their connection with surface plasmons and enhanced spectroscopies as well as photocatalysis is missing. Here, we report on different metals investigated, from the most used nanoporous gold to mixed metal compounds, and discuss each of these plasmonic materials’ suitability for a range of structural design and applications. Finally, we discuss the potentials and limitations of the traditional and alternative plasmonic materials for applications in enhanced spectroscopy and photocatalysis.

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Section: Preparation Strategies and Plasmonic Properties Of Nanoporou...mentioning

confidence: 99%

Section: Preparation Strategies and Plasmonic Properties Of Nanoporou...mentioning

confidence: 99%

Nanoporous Metals: From Plasmonic Properties to Applications in Enhanced Spectroscopy and Photocatalysis

et al. 2021

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“…Considerable efforts have been devoted toward the fabrication of efficient SERS substrates, aiming to detect very low concentrations of molecules. A wide range of materials could be used as SERS substrates based on the aggregation of nanoparticles or metal nanostructures fabricated directly on solid substrates. ,,,− Particularly, metal nanoporous films have attracted much attention due to their remarkable morphology characterized by three-dimensional networks of interconnected ligaments at the nanoscale. − Their porosity gives them a high specific surface area to adsorb molecules and improve their performances as sensors. SERS sensitivity of these films could be attributed to the presence of hot spots located in nanogaps between ligaments.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Gold Stacked Layers as Substrates for SERS Detection in Liquids or Gases with Ultralow Detection Limits and Long-Term Stability

et al. 2022

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Surface-enhanced Raman scattering (SERS) substrates consisting of stacked ultrathin nanoporous gold layers are used to detect very low concentrations of molecules in liquids or gases. The SERS substrates are obtained by copper chemical etching of alternative copper and gold stacked nanolayers. This process is a reliable method for fabricating uniform and reproducible SERS substrates, with a robust SERS response at extremely low detection limits. By optimizing fabrication conditions combined with a thorough analysis of the SERS mappings and using 2,2-bipyridine (BP) as probe molecules, the detection threshold corresponding to a detectable SERS response reaches a BP concentration of 10–18 mol·L–1 in water. An additional Raman mechanism is also highlighted by μ-surface enhancement spatially offset Raman spectroscopy (μ-SESORS): gold ligaments, inside nanoporous layers, act as waveguides for the incident light, leading to a significant increase in the size of the active SERS area. Moreover, these SERS substrates could be stored for several days without a significant decrease in their properties, and they can be reactivated and reused after SERS analysis. The ability to detect low BP vapor pressure is also demonstrated.

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“…Among them, nanoporous materials show superior properties due to their interconnected nanostructures and large surface areas [11,12]. A myriad of techniques is available for the synthesis of porous nanostructures [13,14].…”

Section: Introductionmentioning

confidence: 99%

Combining PVD structuration with dealloying for the creation of a highly efficient SERS platform

Chauvin¹,

Puglisi²,

Thiry³

et al. 2022

Preprint

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Nanostructured noble metal thin films are highly studied for their interesting plasmonic properties. The latter can be effectively used for the detection of small and highly diluted molecules by the surface-enhanced Raman scattering (SERS) effect. Regardless of impressive detection limits achieved, synthesis complexity and the high cost of gold restrict their use in devices. Here, we report on a novel two-step approach to design and fabricate efficient SERS platforms that combines the deposition of a silver-aluminum thin film with dealloying. The magnetron sputtering technique was used for the deposition of the alloy thin film to be dealloyed. After dealloying, the resulting silver nanoporous structures revealed two degrees of porosity: a macroporosity, associated to the initial alloy morphology and a nanoporosity, related to the dealloying step. The resulting nanoporous columnar structure was finely optimized by tuning the deposition (i.e., the alloy chemical composition) and dealloying (i.e., dealloying media) parameters to reach the best SERS properties. These are reported for the samples dealloyed in HCl and with 30 at.% of silver at the initial state with a detection limit down to 10-10 mol.L-1 for a solution of Rhodamine B.

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Nanoporous FePd alloy as multifunctional ferromagnetic SERS-active substrate

Cited by 16 publications

References 56 publications

Nanoporous Metals: From Plasmonic Properties to Applications in Enhanced Spectroscopy and Photocatalysis

Nanoporous Metals: From Plasmonic Properties to Applications in Enhanced Spectroscopy and Photocatalysis

Nanoporous Gold Stacked Layers as Substrates for SERS Detection in Liquids or Gases with Ultralow Detection Limits and Long-Term Stability

Combining PVD structuration with dealloying for the creation of a highly efficient SERS platform

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