SERS detection of R6G based on a novel graphene oxide/silver nanoparticles/silicon pyramid arrays structure

Zhang, C; Jiang, Shouzhen; Huo, Yanyan; Liu, A H; Xu, Shicai; Liu, X Y; Sun, Zhencui; Xu, Yuanyuan; Li, Z; Man, Baoyuan

doi:10.1364/oe.23.024811

Cited by 184 publications

(70 citation statements)

References 29 publications

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“…[31][32][33][34] Here, we mainly study the performance of sensor when three kinds of two-dimensional materials (WS 2 , graphene and MoS 2 ) are covered on bimetallic layer. [32][33][34] To optimize the number of two-dimensional material layers, we plotted the reectivity curves of the SPR sensor composed of Au-Ag bimetallic lm and two dimensional materials with different numbers of layer, as shown in Fig. 3(a-c).…”

Section: -30mentioning

confidence: 99%

Theoretical design of a surface plasmon resonance sensor with high sensitivity and high resolution based on graphene–WS₂ hybrid nanostructures and Au–Ag bimetallic film

et al. 2017

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aWe proposed a high sensitivity and a high resolution surface plasmon resonance sensor composed of graphene-WS 2 hybrid nanostructure and Au-Ag bimetallic-layers film. The bimetallic-layer configuration uses the high sensitivity of gold and the narrow full width at half maximum (FWHM) of silver to improve the sensor's sensitivity and resolution respectively. Graphene and WS 2 serve as an effective light absorption medium. Once they cover the bimetallic-layer, the sensitivity can be further improved significantly. Graphene-WS 2 -Au-Ag model shows a higher sensitivity and higher resolution than that of the conventional sensing scheme where pure Au thin film is used. In our paper, we mainly use Fresnel equations and the transfer matrix method (TMM) to study the reflectivity and sensitivity as well as the full width at half maximum (FWHM) of the SPR sensor.

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Section: -30mentioning

confidence: 99%

Theoretical design of a surface plasmon resonance sensor with high sensitivity and high resolution based on graphene–WS₂ hybrid nanostructures and Au–Ag bimetallic film

et al. 2017

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“…This EM enhancement directly depends on the morphology of the metal surface, the wavelength of the incident light, and the dielectric constant of the surrounding medium of the metal. The EM enhancement factor can reach over 10 8 to enable ultrasensitive SERS detection down to the single‐molecule level …”

Section: Introductionmentioning

confidence: 99%

Extraordinary Sensitivity of Surface‐Enhanced Raman Spectroscopy of Molecules on MoS₂ (WS₂) Nanodomes/Graphene van der Waals Heterostructure Substrates

Ghopry

Alamri

Goul

et al. 2019

Advanced Optical Materials

105

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electromagnetic enhancement (EM) and chemical enhancement (CM). The EM involves the local electromagnetic field enhancement that is typically attributed to the localized surface plasmonic resonance (LSPR) of free charge carriers at the surface of the metal nanostructures induced by the incident light. The LSPR wavelength is determined primarily by the free charge carrier concentration of the metal with a minor effect of the dimension and shape of the metal nanostructures. Molecules positioned [2] close to the LSPR nanostructures experience an enhanced evanescent electromagnetic field as compared to the incident excitation. This EM enhancement directly depends on the morphology of the metal surface, the wavelength of the incident light, and the dielectric constant of the surrounding medium of the metal. The EM enhancement factor can reach over 10 8 to enable ultrasensitive SERS detection down to the single-molecule level. [4][5][6] The CM is induced by the charge transfer between the SERS substrate and molecule with an enhancement factor typically on the order of 10 1 to 10 3 . [7][8][9] The CM effect is dictated by the interface electronic structures between the analyte and substrate and can be optimized by selecting a substrate with favorable band alignment with the highestoccupied molecular orbital (HOMO) and the lowest-unoccupied molecular orbital (LUMO) at the interface where the analyte (or probe molecule) bond to the substrate. Thus, tuning of the substrate electronic structure is important to an enhanced CM effect. [10] This has prompted intensive research exploring graphene-based SERS substrates considering the unique 2D atomically flat surface with delocalized π bonds, chemical inertness, biological compatibility, superior electronic and photonic properties, and the intrinsic Fermi energy at ≈4.5 eV that is compatible, as well as tunable, for CM enhancement with a large number of probe molecules. [7,8,11,12] Therefore, graphene is an excellent SERS substrate primarily due to the CM effect with the adsorbed molecules and the enhancement factor is quantitatively affected by the alignment of the probe molecule electronic structure with the Fermi level of graphene. [3,8] The EM and CM enhancement factors may be combined by adding metal nanostructures on graphene. [7,13] Since the Two-dimensional transition metal dichalcogenides (TMDs)/graphene van der Waals (vdW) heterostructures integrate the superior light-solid interaction in TMDs and charge mobility in graphene, and therefore are promising for surface-enhanced Raman spectroscopy (SERS). Herein, a novel TMD (MoS 2 and WS 2 ) nanodome/graphene vdW heterostructure SERS substrate, on which an extraordinary SERS sensitivity is achieved, is reported. Using fluorescent Rhodamine 6G (R6G) as probe molecules, the SERS sensitivity is in the range of 10 −11 to 10 −12 m on the TMD nanodomes/ graphene vdW heterostructure substrates using 532 nm Raman excitation, which is comparable to the best sensitivity reported so far using plasmonic metal nanostructures/graphene ...

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“…Surface enhanced Raman scattering (SERS), since it was first demonstrated in 1974, has been widely studied regarding both its enhancement mechanism and enhanced properties . With the development of SERS over the past several decades, SERS substrates based on different materials, such as metal, semiconductor, and 2D material, have been designed. The various SERS substrates can be divided into two categories in terms of their surface structure: 2D and 3D substrates.…”

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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SERS detection of R6G based on a novel graphene oxide/silver nanoparticles/silicon pyramid arrays structure

Cited by 184 publications

References 29 publications

Theoretical design of a surface plasmon resonance sensor with high sensitivity and high resolution based on graphene–WS₂ hybrid nanostructures and Au–Ag bimetallic film

Theoretical design of a surface plasmon resonance sensor with high sensitivity and high resolution based on graphene–WS₂ hybrid nanostructures and Au–Ag bimetallic film

Extraordinary Sensitivity of Surface‐Enhanced Raman Spectroscopy of Molecules on MoS₂ (WS₂) Nanodomes/Graphene van der Waals Heterostructure Substrates

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

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SERS detection of R6G based on a novel graphene oxide/silver nanoparticles/silicon pyramid arrays structure

Cited by 184 publications

References 29 publications

Theoretical design of a surface plasmon resonance sensor with high sensitivity and high resolution based on graphene–WS2 hybrid nanostructures and Au–Ag bimetallic film

Theoretical design of a surface plasmon resonance sensor with high sensitivity and high resolution based on graphene–WS2 hybrid nanostructures and Au–Ag bimetallic film

Extraordinary Sensitivity of Surface‐Enhanced Raman Spectroscopy of Molecules on MoS2 (WS2) Nanodomes/Graphene van der Waals Heterostructure Substrates

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

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Theoretical design of a surface plasmon resonance sensor with high sensitivity and high resolution based on graphene–WS₂ hybrid nanostructures and Au–Ag bimetallic film

Theoretical design of a surface plasmon resonance sensor with high sensitivity and high resolution based on graphene–WS₂ hybrid nanostructures and Au–Ag bimetallic film

Extraordinary Sensitivity of Surface‐Enhanced Raman Spectroscopy of Molecules on MoS₂ (WS₂) Nanodomes/Graphene van der Waals Heterostructure Substrates