Micro-cones Array-Based Plasmonic Metasurface for Sensitive and Enhanced Raman Detection

Cui, Songya; Tian, Chengxiang; Su, Yanling; Tian, Jiaguo; Fu, Yongqi

doi:10.1007/s11468-020-01223-6

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…The BT molecules exhibit four representative Raman characteristics at 1001, 1024, 1074, and 1571 cm −1 , corresponding to C─H wagging, C─C symmetric stretching, C─C asymmetric stretching, and C─C ring stretching modes, respectively. [42,43] When we compare SERS spectra of three samples under the same concentration of 10 −4 m at which the SERS substrates were believed to be fully saturated, the SERS intensities decreased in the order of Auelongated dodecahedrons (11 600 cts) > Au dodecahedral-walled NFs (4900 cts) > Au NRs with round tips (2800 cts) (top spectra in each panel in Figure 5F-H). This is because Au dodecahedralwalled NFs have not only sharp edges and flat, large terraces, but also tip-framed sharp vertices that allow utilization of inner hot zones, which are different from those of all open NFs, which normally show lower SERS intensity compared to that of the solid analog.…”

Section: Sers Activity Comparison With Round-tip Au Nrs and Elongated...mentioning

confidence: 99%

Plasmonic Dodecahedral‐Walled Elongated Nanoframes for Surface‐Enhanced Raman Spectroscopy

Hilal,

Haddadnezhad,

et al. 2023

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Here, elongated pseudohollow nanoframes composed of four rectangular plates enclosing the sides and two open‐frame ends with four ridges pointing at the tips for near‐field focusing are reported. The side facets act as light‐collecting domains and transfer the collected light to the sharp tips for near‐field focusing. The nanoframes are hollow inside, allowing the gaseous analyte to penetrate through the entire architecture and enabling efficient detection of gaseous analytes when combined with Raman spectroscopy. The resulting nanostructures are named Au dodecahedral‐walled nanoframes. Synthesis of the nanoframes involves shape transformation of Au nanorods with round tips to produce Au‐elongated dodecahedra, followed by facet‐selective Pt growth, etching of the inner Au, and regrowth steps. The close‐packed assembly of Au dodecahedral‐walled nanoframes exhibits an attomolar limit of detection toward benzenethiol. This significant enhancement in SERS is attributed to the presence of a flat solid terrace for a large surface area, sharp edges and vertices for strong electromagnetic near‐field collection, and open frames for effective analyte transport and capture. Moreover, nanoframes are applied to detect chemical warfare agents, specifically mustard gas simulants, and 20 times higher sensitivity is achieved compared to their solid counterparts.

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Section: Sers Activity Comparison With Round-tip Au Nrs and Elongated...mentioning

confidence: 99%

Plasmonic Dodecahedral‐Walled Elongated Nanoframes for Surface‐Enhanced Raman Spectroscopy

Hilal,

Haddadnezhad,

et al. 2023

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“…Remarkable examples of plasmonic structures for SERS are the so-called C-shaped structures [38][39][40][41]. Other examples relying on nano-fabrication techniques have been proposed with exceptional results [35,[42][43][44][45][46][47]. These resonant plasmonic structures are usually fabricated through classic nano-lithography techniques that involve electron beam lithography and lift-off procedures.…”

Section: Introductionmentioning

confidence: 99%

Raman Scattering Enhancement through Pseudo-Cavity Modes

Caligiuri,

Nucera,

Patra

et al. 2024

Nanomaterials

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Raman spectroscopy plays a pivotal role in spectroscopic investigations. The small Raman scattering cross-section of numerous analytes, however, requires enhancement of the signal through specific structuring of the electromagnetic and morphological properties of the underlying surface. This enhancement technique is known as surface-enhanced Raman spectroscopy (SERS). Despite the existence of various proposed alternatives, the approach involving Fabry–Pérot cavities, which constitutes a straightforward method to enhance the electromagnetic field around the analyte, has not been extensively utilized. This is because, for the analyte to experience the maximum electric field, it needs to be embedded within the cavity. Consequently, the top mirror of the cavity will eventually shield it from the external laser source. Recently, an open-cavity configuration has been demonstrated to exhibit properties similar to the classic Fabry–Pérot configuration, with the added advantage of maintaining direct accessibility for the laser source. This paper showcases how such a simple yet innovative configuration can be effectively utilized to achieve remarkable Raman enhancement. The simple structure, coupled with its inexpensive nature and versatility in material selection and scalability, makes it an ideal choice for various analytes and integration into diverse Raman apparatus setups.

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