Sensitivity enhancement of surface plasmon resonance sensor based on graphene–MoS2 hybrid structure with TiO2–SiO2 composite layer

Maurya, Jitendra Bahadur; Prajapati, Yogendra Kumar; Singh, Vivek; Saini, J. P.

doi:10.1007/s00339-015-9442-3

Cited by 135 publications

(54 citation statements)

References 22 publications

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“…However, the calculated values are less than half of the lowest experimental value [15,[40][41][42]. The predicted shift of ~0.1 degree is always reached when graphene is treated as a 0.34-nm thick flat homogeneous film with a refractive index of ~2.95+1.54i, which is an in-plane index obtained by ellipsometry [22,[32][33][34][35][36][37][38]. The same SPR shift is obtained for our three types of Au films if we follow the same modelling approach.…”

Section: Resultssupporting

confidence: 71%

“…Graphene induced SPR shift has also been calculated by many groups [32][33][34][35][36][37][38]. However, the calculated values are less than half of the lowest experimental value [15,[40][41][42].…”

Section: Resultsmentioning

confidence: 99%

“…It is important to point out that graphene is still quite flat (Fig. 4b), it is also anisotropic, although it has been treated as an isotropic medium in previous calculations of SPR shift [32][33][34][35][36][37][38]. The effective dielectric constant can be conveniently derived based on its definition and Maxwell equation's boundary conditions: ɛ eff is the ratio of average electric flux density, D, to average electric field, E; E is continuous in parallel direction) and D is continuous in perpendicular direction [3].…”

Section: − −1 +2mentioning

confidence: 99%

“…However, there has been a big discrepancy between theory and experiment. Based on the flat graphene picture, the SPR shift of an Au film in resonant angle with and without single layer graphene in air is calculated to be less than 0.1 degree [32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Large graphene-induced shift of surface-plasmon resonances of gold films: Effective-medium theory for atomically thin materials

Alam

Niu

Wang

et al. 2020

Phys. Rev. Research

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Despite successful modeling of graphene as a 0.34-nm thick optical film synthesized by exfoliation or chemical vapor deposition (CVD), graphene induced shift of surface plasmon resonance (SPR) of gold films has remained controversial. Here we report the resolution of this controversy by developing a clean CVD graphene transfer method and extending Maxwell-Garnet effective medium theory (EMT) to 2D materials. A SPR shift of 0.24º is obtained and it agrees well with 2D EMT in which wrinkled graphene is treated as a 3-nm graphene/air layered composite, in agreement with the average roughness measured by atomic force microscope. Because the anisotropic built-in boundary condition of 2D EMT is compatible with graphene's optical anisotropy, graphene can be modelled as a film thicker than 0.34-nm without changing its optical property; however, its actual roughness, i.e., effective thickness will significantly alter its response to strong out-of-plane fields, leading to a larger SPR shift.

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Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: − −1 +2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Large graphene-induced shift of surface-plasmon resonances of gold films: Effective-medium theory for atomically thin materials

Alam

Niu

Wang

et al. 2020

Phys. Rev. Research

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“…represents FWHM (full width half maxima) of the reflectance curve correspond− ing to 50% reflectivity [19][20]. The detection accuracy of the proposed sensor is far better than that of metal clad waveguide sensor [9] in case of silver cladding, while it is comparable in case of gold metal cladding as shown in Table 5.…”

Section: Analysis Of a Metal Clad Waveguide Sensor Having Metamateriamentioning

confidence: 73%

Analysis of a metal clad waveguide sensor having metamaterial as a guiding layer

Upadhyay

Prajapati

Tripathi

et al. 2016

Opto-Electronics Review

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2D Van der Waals Heterostructures for Chemical Sensing

Hou

Anichini

Samorı́

et al. 2022

Adv Funct Materials

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During the last 15 years, 2D materials have revolutionized the field of materials science. Moreover, because of their highest surface‐to‐volume ratio and properties extremely susceptible to their interaction with the local environment they became powerful active components for the development the high‐performance chemical sensors. By combining different 2D materials to form van der Waals heterostructures (VDWHs) it is possible to overcome the drawback of individual materials (such as inertness and zero‐bandgap of pristine graphene and less environmental stability of transition metal dichalcogenides). Meanwhile, VDWHs possess unprecedented and fascinating properties arising from the intimate interaction between the components, which can yield superior sensitivities, higher selectivity, and stability when employed to detect gases, biomolecules, and other organic/inorganic molecules. Herein, the latest developments and advances in the field of chemical sensors based on VDWH of 2D materials, with specific insight into the sensing mechanisms, are reviewed and future directions, challenges, and opportunities for the development of the next generation of (bio)chemical sensors with potential impact in environmental sciences and biomedical applications, and more specifically in (bio)chemical defense, industrial safety, food, and environmental surveillance, and medical (early) diagnostics, are discussed.

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Sensitivity enhancement of surface plasmon resonance sensor based on graphene–MoS2 hybrid structure with TiO2–SiO2 composite layer

Cited by 135 publications

References 22 publications

Large graphene-induced shift of surface-plasmon resonances of gold films: Effective-medium theory for atomically thin materials

Large graphene-induced shift of surface-plasmon resonances of gold films: Effective-medium theory for atomically thin materials

Analysis of a metal clad waveguide sensor having metamaterial as a guiding layer

2D Van der Waals Heterostructures for Chemical Sensing

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