Ag-Ni bimetallic film on CaF2 prism for high sensitive surface plasmon resonance sensor

We present a surface plasmon resonance (SPR) structure based on Kretschmann configuration incorporating bimetallic layers of noble (Ag) and magnetic materials (Ni) over CaF2 prism. Extensive numerical analysis based on transfer matrix theory has been performed to characterize the sensor response considering sensitivity, full width at half maxima, and minimum reflection. Notably, the proposed structure, upon suitably optimizing the thickness of bimetallic layer provides consistent enhancement of sensitivity over other competitive SPR structures. Hence we believe that this proposed SPR sensor could find the new platform for the medical diagnosis, chemical examination and biological detection. Full Text: PDF ReferencesJ. Homola, S.S. Yee, G. Gauglitz, "Surface plasmon resonance sensor based on planar light pipe: theoretical optimization analysis", Sens. Actuators B Chem. 54, 3 (1999). CrossRef X.D. Hoa, A.G. Kirk, M. Tabrizian, "Towards integrated and sensitive surface plasmon resonance biosensors: A review of recent progress", Bioelectron, 23, 151 (2007). CrossRef Z. Lin, L. Jiang, L. Wu, J. Guo, X. Dai, Y. Xiang, D. Fan, "Tuning and Sensitivity Enhancement of Surface Plasmon Resonance Biosensor With Graphene Covered Au-MoS 2-Au Films", IEEE Photonics J. 8(6), 4803308 (2016). CrossRef T. Srivastava, R. Jha, R. Das, "High-Performance Bimetallic SPR Sensor Based on Periodic-Multilayer-Waveguides", IEEE Photonics Technol. Lett. 23(20), 1448 (2011). CrossRef P.K. Maharana, R. Jha, "Chalcogenide prism and graphene multilayer based surface plasmon resonance affinity biosensor for high performance", Sens. Actuators B Chem. 169, 161 (2012). CrossRef R. Verma, B.D. Gupta, R. Jha, "Sensitivity enhancement of a surface plasmon resonance based biomolecules sensor using graphene and silicon layers", Sens. Actuators B Chem. 160, 623 (2011). CrossRef I. Pockrand, "Surface plasma oscillations at silver surfaces with thin transparent and absorbing coatings", Surf. Sci. 72, 577 (1978). CrossRef R. Jha, A. Sharma, "High-performance sensor based on surface plasmon resonance with chalcogenide prism and aluminum for detection in infrared", Opt. Lett. 34(6), 749 (2009). CrossRef E.V. Alieva, V.N. Konopsky, "Biosensor based on surface plasmon interferometry independent on variations of liquid’s refraction index", Sens. Actuators B Chem. 99, 90 (2004). CrossRef S.A. Zynio, A. Samoylov, E. Surovtseva, V. Mirsky, Y. Shirshov, "Bimetallic Layers Increase Sensitivity of Affinity Sensors Based on Surface Plasmon Resonance", Sensors 2, 62 (2002). CrossRef S.Y. Wu, H.P. Ho, "Sensitivity improvement of the surface plasmon resonance optical sensor by using a gold-silver transducing layer", Proceedings IEEE Hong Kong Electron Devices Meeting 63 (2002). CrossRef B.H. Ong, X. Yuan, S. Tjin, J. Zhang, H. Ng, "Optimised film thickness for maximum evanescent field enhancement of a bimetallic film surface plasmon resonance biosensor", Sens. Actuators B Chem. 114, 1028 (2006). CrossRef B.H. Ong, X. Yuan, Y. Tan, R. Irawan, X. Fang, L. Zhang, S. Tjin, "Two-layered metallic film-induced surface plasmon polariton for fluorescence emission enhancement in on-chip waveguide", Lab Chip 7, 506 (2007). CrossRef X. Yuan, B. Ong, Y. Tan, D. Zhang, R. Irawan, S. Tjin, "Sensitivity–stability-optimized surface plasmon resonance sensing with double metal layers", J. Opt. A: Pure Appl. Opt. 8, 959, (2006). CrossRef M. Ghorbanpour, "A novel method for the production of highly adherent Au layers on glass substrates used in surface plasmon resonance analysis: substitution of Cr or Ti intermediate layers with Ag layer followed by an optimal annealing treatment", J. Nanostruct, 3, 309, (2013). CrossRef Y. Chen, R.S. Zheng, D.G. Zhang, Y.H. Lu, P. Wang, H. Ming, Z.F. Luo, Q. Kan, "Bimetallic chips for a surface plasmon resonance instrument", Appl. Opt. 50, 387 (2011). CrossRef N.H.T. Tran, B.T. Phan, W.J. Yoon, S. Khym, H. Ju, "Dielectric Metal-Based Multilayers for Surface Plasmon Resonance with Enhanced Quality Factor of the Plasmonic Waves", J. Electron. Mater. 46, 3654 (2017). CrossRef D. Nesterenko Z. Sekkat, "Resolution Estimation of the Au, Ag, Cu, and Al Single- and Double-Layer Surface Plasmon Sensors in the Ultraviolet, Visible, and Infrared Regions", Plasmonics 8, 1585 (2013). CrossRef M.A. Ordal, R.J. Bell, R.W. Alexander, L.L. Long, M.R. Querry, "Optical properties of fourteen metals in the infrared and far infrared: Al, Co, Cu, Au, Fe, Pb, Mo, Ni, Pd, Pt, Ag, Ti, V, and W.", Appl. Opt. 24, 4493 (1985). CrossRef H. Ehrenreich, H.R. Philipp, D.J. Olechna, "Optical Properties and Fermi Surface of Nickel", Phys. Rev. 31, 2469 (1963). CrossRef S. Shukla, N.K. Sharma, V. Sajal, "Theoretical Study of Surface Plasmon Resonance-based Fiber Optic Sensor Utilizing Cobalt and Nickel Films", Braz. J. Phys. 46, 288 (2016). CrossRef K. Shah, N.K. Sharma, AIP Conf. Proc. 2009, 020040 (2018). [23] G. AlaguVibisha, Jeeban Kumar Nayak, P. Maheswari, N. Priyadharsini, A. Nisha, Z. Jaroszewicz, K.B. Rajesh, "Sensitivity enhancement of surface plasmon resonance sensor using hybrid configuration of 2D materials over bimetallic layer of Cu–Ni", Opt. Commun. 463, 125337 (2020). CrossRef A. Nisha, P. Maheswari, P.M. Anbarasan, K.B. Rajesh, Z. Jaroszewicz, "Sensitivity enhancement of surface plasmon resonance sensor with 2D material covered noble and magnetic material (Ni)", Opt. Quantum Electron. 51, 19 (2019). CrossRef M.H.H. Hasib, J.N. Nur, C. Rizal, K.N. Shushama, "Improved Transition Metal Dichalcogenides-Based Surface Plasmon Resonance Biosensors", Condens.Matter 4, 49, (2019). CrossRef S. Herminjard, L. Sirigu, H. P. Herzig, E. Studemann, A. Crottini, J.P. Pellaux, T. Gresch, M. Fischer, J. Faist, "Surface Plasmon Resonance sensor showing enhanced sensitivity for CO2 detection in the mid-infrared range", Opt. Express 17, 293 (2009). CrossRef M. Wang, Y. Huo, S. Jiang, C. Zhang, C. Yang,T. Ning, X. Liu, C Li, W. Zhanga, B. Mana, "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", RSC Adv. 7, 47177 (2017). CrossRef P.K. Maharana, P. Padhy, R. Jha, "On the Field Enhancement and Performance of an Ultra-Stable SPR Biosensor Based on Graphene", IEEE Photonics Technol. Lett. 25, 2156 (2013). CrossRef

A High-Sensitivity SPR Sensor with Bimetal/Silicon/Two-Dimensional Material Structure: A Theoretical Analysis

In this paper, we reported a theoretical study of a novel Surface plasmon resonance (SPR) biosensor composed of BK7 prism, gold (Au)/silver (Ag) bimetallic layer, silicon and two-dimensional (2D) materials. The bimetallic layer combines the advantages of Au and Ag and the high refractive index silicon layer enhances the electric field on the surface of the sensor, so that the sensor has a better overall performance in terms of sensitivity and figure of merit (FOM). Compared with ordinary dielectrics, 2D materials have excellent photoelectric properties, such as larger specific surface area, higher carrier density and stronger adsorption capacity, which improve the detection ability of the sensor. The sensitivity of the optimized sensor achieves 297.2°/RIU, 274°/RIU and 246°/RIU when the silicon layer is covered with graphene, MXene (Ti3T2Cx) and MoS2, respectively. Compared with the traditional SPR sensor, the sensitivity of the structure has been significantly improved, and its excellent performance has broad application prospects in biosensing and other fields.

Sensitivity Enhancement of Ag-Ni Functional Bimetallic SPR Sensor Using Black Phosphorus in the Visible Region

In this seminal, a highly sensitive bimetallic layer for surface plasmon resonance (SPR) sensor applications is proposed with the BK7 prism, silver–nickel (Ag–Ni) bimetallic films, and hybrid structure of black phosphorus layer under angular interrogation technique. Sensitivity, minimum reflectivity (Rmin), DA, and FoM are the criterion for the sensing applications. By tuning these parameters, the maximum sensitivity of 347°/RIU is obtained with two-dimensional (2D) black phosphorus and the optimized thickness of the Silver layer at 633nm wavelength. 2D black phosphorus (BP) has attracted immense interest from the research community because of its unique properties like high charge density, direct bandgap, and better binding to the various molecules. The noble bimetallic layer-based SPR sensors have improved the sensor performance due to their exciting properties of large optical field enhancements follow on to the strong scattering and absorption of light. Herein, the Black Phosphorus-based SPR sensor is optimized with the thickness variation of the Silver layer due to ease of synthesis, a high degree of surface functionalization, and tunable Physico-chemical properties to the various sensing-medium refractive indices ranging from 1.330 to 1.335. Although there are many analogous sensors reported, limited attention has been paid to propose one, which exhibits the higher sensitivity, better DA, and superior FoM. The increased sensitivity of bimetallic layer and 2D, Black Phosphorus-based sensor providing promising applications in biosensing.

Surface Plasmon Resonance (SPR) based biosensor using MXene as a BRE layer and Magnesium Oxide (MgO) as an Adhesion layer

In this paper a plasmonic sensor consist of bimetallic layer of Ag and Au, a nono-thin layer of two dimension material MXene and a thin layer of Magnesium oxide (MgO) is proposed to operate in visible region. By using Kretschmann configuration based structure and transfer matrix method, the change in the refractive index of liquid Biosample have been observed at a fixed incident wavelength. By using the distinctive properties of Ti3C2Tx MXene and MgO we have investigated the performance of Surface Plasmon Resoance (SPR) biosensor. Significant performance parameters like Sensitivity, Figure of Merit (FoM) and Detection Accuracy (DA) calculated for different cases to prove the capability of proposed sensing structure. We also compared the sensitivity and sharpness of SPR curve obtained when using conventional adhesion layers like titanium (Ti), chromium (Cr), tantalum (Ta). A detailed investigation is carried out to observe the role of polymer as an adhesion layer and its thickness impact on FoM and resonance angle sharpness. The concept of Long range SPR (LR-SPR) and Short range SPR (SR-SPR) also discussed.

Facile Direct Seed-Mediated Growth of AuPt Bimetallic Shell on the Surface of Pd Nanocubes and Application for Direct H2O2 Synthesis

The selective enhancement of catalytic activity is a challenging task, as catalyst modification is generally accompanied by both desirable and undesirable properties. For example, in the case of the direct synthesis of hydrogen peroxide, Pt on Pd improves hydrogen conversion, but lowers hydrogen peroxide selectivity, whereas Au on Pd enhances hydrogen peroxide selectivity but decreases hydrogen conversion. Toward an ideal catalytic property, the development of a catalyst that is capable of improving H-H dissociation for increasing H2 conversion, whilst suppressing O-O dissociation for high H2O2 selectivity would be highly beneficial. Pd-core AuPt-bimetallic shell nanoparticles with a nano-sized bimetallic layer composed of Au-rich or Pt-rich content with Pd cubes were readily prepared via the direct seed-mediated growth method. In the Pd-core AuPt-bimetallic shell nanoparticles, Au was predominantly located on the {100} facets of the Pd nanocubes, whereas Pt was deposited on the corners of the Pd nanocubes. The evaluation of Pd-core AuPt-bimetallic shell nanoparticles with varying Au and Pt contents revealed that Pd-core AuPt-bimetallic shell that was composed of 2.5 mol% Au and 5 mol% Pt, in relation to Pd, exhibited the highest H2O2 production rate (914 mmol H2O2 gmetal−1 h−1), due to the improvement of both H2O2 selectivity and H2 conversion.

Surface Plasmon Resonance sensor based on a D-shaped photonic crystal fiber with a bimetallic layer

The investigation of a D-shaped photonic crystal fiber sensor with a bimetallic layer for operation at the visible and infrared spectra is presented. The bimetallic layer is composed by silver and gold slabs deposited adjacently on the flat face of the fiber. It is shown that this architecture allows the excitation of two sharply distinguished plasmon resonance, which suggest potential applications for multiparameter sensing.