Constructing sensitive SERS substrate with a sandwich structure separated by single layer graphene

Zhao, Yuan; Chu, Binhua; Zhang, Lichun; Zhao, Fangchao; Yan, Jinliang; Li, Xiyu; Liu, Qiyi; Lu, Yalin

doi:10.1016/j.snb.2018.02.037

Cited by 22 publications

(9 citation statements)

References 63 publications

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“…Other studies have demonstrated the deposition of monolayers such as graphene [ 44 , 45 ] and MoS 2 [ 46 ] as sub-nanometer spacers between NP-NP structures. In real-world applications, such as the sensing of drugs [ 47 ], pollutants [ 48 ], and cancer diagnosis [ 49 ], having an e-field enhancement over large matrix volumes is highly desirable as it increases the probability of detection [ 6 ]. However, having high enhancement values for cases where the particle is touching the surface of the nanohole arrays is not surprising, since it has been demonstrated that a particle touching another metallic surface has the ability to collect and concentrate broadband radiation in the vicinity of the contact point [ 50 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

“…Metallic nanostructures that support surface plasmon resonance (SPR) have been extensively researched in the past decade and employed in several sensing and biosensing applications, including cell analysis [ 1 ], the detection and quantification of infectious diseases [ 2 , 3 , 4 ], and cancer biomarker quantification [ 5 ]. SPR is based on the collective oscillation of conduction electrons, which promotes an enhancement of the electromagnetic field at the metal-dielectric interface [ 6 ]. The plasmonic signal arising from the resonance is highly sensitive to changes in refractive index (RI) at the interface.…”

Section: Introductionmentioning

confidence: 99%

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FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection

et al. 2022

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Metallic nanoparticles (MNPs) and metallic nanostructures are both commonly used, independently, as SERS substrates due to their enhanced plasmonic activity. In this work, we introduce and investigate a hybrid nanostructure with strong SERS activity that benefits from the collective plasmonic response of the combination of MNPs and flow-through nanohole arrays (NHAs). The electric field distribution and electromagnetic enhancement factor of hybrid structures composed of silver NPs on both silver and gold NHAs are investigated via finite-difference time-domain (FDTD) analyses. This computational approach is used to find optimal spatial configurations of the nanoparticle positions relative to the nanoapertures and investigate the difference between Ag-NP-on-Ag-NHAs and Ag-NP-on-Au-NHAs hybrid structures. A maximum GSERS value of 6.8 × 109 is achieved with the all-silver structure when the NP is located 0.5 nm away from the rim of the NHA, while the maximum of 4.7 × 1010 is obtained when the nanoparticle is in full contact with the NHA for the gold-silver hybrid structure. These results demonstrate that the hybrid nanostructures enable hotspot formation with strong SERS activity and plasmonic enhancement compatible with SERS-based sensing applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection

et al. 2022

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“…Graphene has been proven to be an efficient SERS substrates (Lv et al, 2012(Lv et al, , 2014Ling et al, 2014;Feng et al, 2016;Tan et al, 2017;Zhao et al, 2018). So, we conducted control experiments to compare the SERS effects of NbS 2 and graphene.…”

Section: Resultsmentioning

confidence: 99%

Controllable Growth of Few-Layer Niobium Disulfide by Atmospheric Pressure Chemical Vapor Deposition for Molecular Sensing

Qin

2019

Front. Mater.

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Two-dimensional metallic NbS 2 has attracted increasing attentions due to its excellent properties. So far, the preparations of NbS 2 are mainly focused on the mechanical exfoliation and molecular beam epitaxial (MBE), both of which have limitations, such as, small lateral sizes (usually <1 µm), low yield, etc. Chemical vapor deposition (CVD) has been used to synthesize NbS 2 , but mainly depends on atomically flat substrates (e.g., graphene, h-BN) to grow thinner and larger sheets and the growth of NbS 2 on SiO 2 /Si is still challenging. In this contribution, NbS 2 single crystals with different layers are controllably synthesized. Few-layer NbS 2 single crystals from one layer to nine layers with several tens of micrometers lateral sizes (up to ∼20 µm) can be obtained by controlling hydrogen content in Ar/H 2 carrier gas, NaCl amount, the growth temperature and the growth time, which are much larger than that synthesized by the MBE route. Meanwhile, as-synthesized NbS 2 demonstrates higher sensitivity for probing trace amount of molecules than that of graphene, ascribed to the efficient charge transfer between NbS 2 and molecules.

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“…Since the intensity of the Raman signal is proportional to the fourth power of the electromagnetic field intensity, it makes a major contribution to the EF up to 10 4 − 10 7 (Li et al, 2010). In CM enhancement, charge transfer complexes are formed between chemical probe molecules and substrates, and CE is enhanced when the excitation frequency comes into resonance with charge transfer transitions (Zhao et al, 2018).…”

Section: Surface-enhanced Raman Scatteringmentioning

confidence: 99%

Advanced Nanoporous Anodic Alumina-Based Optical Sensors for Biomedical Applications

Feng

2021

Front. Nanotechnol.

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Close-packed hexagonal array nanopores are widely used both in research and industry. A self-ordered nanoporous structure makes anodic aluminum oxide (AAO) one of the most popular nanomaterials. This paper describes the main formation mechanisms for AAO, the AAO fabrication process, and optical sensor applications. The paper is focused on four types of AAO-based optical biosensor technology: surface-Enhanced Raman Scattering (SERS), surface Plasmon Resonance (SPR), reflectometric Interference Spectroscopy (RIfS), and photoluminescence Spectroscopy (PL). AAO-based optical biosensors feature very good selectivity, specificity, and reusability.

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Constructing sensitive SERS substrate with a sandwich structure separated by single layer graphene

Cited by 22 publications

References 63 publications

FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection

FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection

Controllable Growth of Few-Layer Niobium Disulfide by Atmospheric Pressure Chemical Vapor Deposition for Molecular Sensing

Advanced Nanoporous Anodic Alumina-Based Optical Sensors for Biomedical Applications

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