Graphene-Covered Silver Nanoisland Array Coupling with Hyperbolic Metamaterials for SERS Sensing

Zha, Zhipeng; Liu, Runcheng; Gao, Jinjuan; Yang, Wen; Shafi, Muhammad; Liu, Cong; Xu, Shicai; Shayan, Muhammad; Wang, Sen; Jiang, Shouzhen

doi:10.1021/acsanm.2c00665

Cited by 6 publications

(5 citation statements)

References 51 publications

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“…Compared to other elements, the intensity of Al peaks was markedly lower. According to Figure b, the specific Al 2p signal was split into two different parts at binding energies of 73.5 and 74.4 eV, which represented the characteristic spectra of the 2p from Al metal and the 2p from Al 3+ in aluminum dioxide (Al 2 O 3 ), respectively . The presence of such peaks demonstrated the successful preparation of the Al 2 O 3 film.…”

Section: Resultsmentioning

confidence: 97%

“…The experiments conducted in this work verified that the presence of AgNPs and the graphene surface would increase the SERS performance, so it was reasonably explained that the existence of a graphene layer was responsible for the formation of a dense hot spot zone leading to an enormous electromagnetic field enhancement. , Second, graphene’s uniform surface should have adsorption capability, particularly for organic molecules, and should also lead to excellent chemical enhancement due to its significant contribution to the SERS performance. , Third, the presence of a graphene surface could reduce the AgNP’s catalytic activity and avoid photoinduced carbonization as well as keep organic molecules (thiram and R6G) from coming into direct contact with the AgNPs. As a result, the photocarbonization of adsorbates from the atmosphere and organic molecules was prevented. , …”

Section: Resultsmentioning

confidence: 99%

“…As a result, the photocarbonization of adsorbates from the atmosphere and organic molecules was prevented. 27,30 3.4. Detection of Thiram in Soil with Gr/Ag/HMM.…”

Section: Sers Sensitivity Andmentioning

confidence: 99%

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SERS Sensing Using Graphene-Covered Silver Nanoparticles and Metamaterials for the Detection of Thiram in Soil

et al. 2022

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Multilayer hyperbolic metamaterial (HMM)-based SERS substrates have received special consideration because they accommodate various propagation modes such as surface plasmonic polaritons (SPP). However, the SPP modes are difficult to generate in HMM due to their weak electric field enhancement. In this article, we designed novel SERS substrates consisting of graphene-covered AgNPs and HMM. The graphene-covered AgNPs work as an external coupling structure for hyperbolic metamaterials due to this structure exhibiting significant plasmonic effects as well as unique optical features. The localized surface plasmonic resonance (LSPR) of the graphene-covered AgNPs excited the SPP and thus formed a strong hot spot zone in the nanogap area of the graphene. The Raman experiment was performed using rhodamine 6G (R6G) and crystal violet (CV), which showed high stability and a maximum enhancement factor of 2.12 × 108. The COMSOL simulation further clarified that enhanced SERS performance was due to the presence of monolayer graphene and provided an atomically flat surface for organic molecules in a more controllable manner. Interestingly, the proposed SERS structure carries out quantitative detection of thiram in soil and can satisfy the basic environmental need for pesticide residue in the soil.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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SERS Sensing Using Graphene-Covered Silver Nanoparticles and Metamaterials for the Detection of Thiram in Soil

et al. 2022

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“…chemical (CM) enhancement mechanism [6][7][8]. EM is mainly based on surface plasmon resonance generated by the interaction between the laser source and the SERS active substrate [9,10].…”

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confidence: 99%

Surface-enhanced Raman spectroscopic activity study on topological ZnSe nanostructures

et al. 2022

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Topological nanomaterials generally exhibit different defect structures, high specific surface areas, and varying bandgaps. These special geometries, energy-level structures, and interfacial interaction properties provide possibilities to explore interesting properties in the surface-enhanced Raman scattering (SERS). Such properties offer unexplored possibilities for exploring interesting physics and materials science in the field of SERS physical property research and further enhancing substrate materials’ SERS activity. In this paper, the ZnSe topological nanowire crystallite structure was grown using the chemical vapor deposition method, twin defects were introduced, and a topological branched structure that caused the corresponding changes in SERS activity was systematically investigated. On topological ZnSe nanowires, rhodamine 6G (R6G), methylene blue (MB), and crystalline violet (CV) molecules were detected using Raman spectroscopy. The Raman signal enhancement of MB on topological branched nanowires was about 1.9 times that of the trunk nanowires. Finally, the national standard measurement of malachite green (MG) content in water bodies were realized. The results suggest that semiconductor ZnSe topographical nanowires are an emerging class of SERS substrates, and a thorough investigation into the relationship between material structure and SERS performance in specific topological regions will provide new evidence for the principle of chemical enhancement of SERS, as well as recommendations for developing precisely functionalized SERS substrate nanomaterials.

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“…These works enriched the properties of graphene HMMs. Very recently, graphene HMMs have been utilized in plasmon [34][35][36], microcavity [37], biosensing [38,39], heat transfer [40], and surfaceenhanced Raman spectroscopy [41]. The tunability of graphene HMMs have made it much important in modulation of electromagnetic (EM) waves.…”

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confidence: 99%

Graphene hyperbolic metamaterials: Fundamentals and applications

Li²,

Liang³

2022

EPL

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Metamaterials have shown potential for next generation optical materials since they have special electromagnetic responses which cannot be obtained in natural media. Among various metamaterials, hyperbolic metamaterials (HMMs) with highly anisotropic hyperbolic dispersion provide new ways to manipulate electromagnetic waves. Besides, graphene has attracted lots of attention since it possesses excellent optoelectronic properties. Graphene HMMs combine the extraordinary properties of graphene and the strong light modulation capability of HMMs. The experimental fabrication of graphene HMMs recently proved that graphene HMMs are a good platform for terahertz optical devices. The flexible tunability is a hallmark of graphene-based HMMs devices by external gate voltage, electrostatic biasing, or magnetic field etc. This review provides an overview of up-to-now studies of graphene HMMs and an outlook for the future of this field.

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Graphene-Covered Silver Nanoisland Array Coupling with Hyperbolic Metamaterials for SERS Sensing

Cited by 6 publications

References 51 publications

SERS Sensing Using Graphene-Covered Silver Nanoparticles and Metamaterials for the Detection of Thiram in Soil

SERS Sensing Using Graphene-Covered Silver Nanoparticles and Metamaterials for the Detection of Thiram in Soil

Surface-enhanced Raman spectroscopic activity study on topological ZnSe nanostructures

Graphene hyperbolic metamaterials: Fundamentals and applications

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