Surface plasmon resonance based fiber optic sensor using an additional layer of platinum: A theoretical study

Sharma, Navneet K.; Shukla, Sarika; Sajal, Vivek

doi:10.1016/j.ijleo.2017.01.004

Cited by 30 publications

(8 citation statements)

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“…In these circumstances, PANI can be successfully employed as a functional sensitive layer in energy storage applications [ 21 ], pollutants detection [ 19 , 22 ], gas sensing [ 23 ], and pH monitoring [ 24 , 25 ]. To the best of our knowledge, few theoretical studies were reported with Pt-coated transmission-type FO-SPR sensors [ 26 , 27 ]. Only in our recent work, a Pt-coated reflection-type FO-SPR sensor has been proposed for the first time, wherein the thin Pt plasmonic film has been used in conjunction with a functional PANI film to demonstrate highly-sensitive detection capabilities of the 4-nitrophenol pollutant [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Sensitive pH Monitoring Using a Polyaniline-Functionalized Fiber Optic—Surface Plasmon Resonance Detector

Antohe

Jinga

Antohe

et al. 2021

Sensors

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In this work, we report results on the fabrication and characterization of a surface plasmon resonance (SPR) pH sensor using platinum (Pt) and polyaniline (PANI) layers successively coated over an unclad core of an optical fiber (FO). The plasmonic thin Pt layer was deposited using a magnetron sputtering technique, while the pH-sensitive PANI layer was synthesized using an electroless polymerization method. Moreover, the formation of PANI film was confirmed by X-ray photoelectron spectroscopy (XPS) technique and its surface morphology was investigated using scanning electron microscopy (SEM). It was found that the PANI/Pt-coated FO-SPR pH sensor exhibits a fast and linear response in either acid or alkali solutions (pH operational range: 1 to 14). The proposed FO-SPR sensor could be used for biomedical applications, environmental monitoring or any remote, real-time on-site measurements.

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Section: Introductionmentioning

confidence: 99%

Sensitive pH Monitoring Using a Polyaniline-Functionalized Fiber Optic—Surface Plasmon Resonance Detector

Antohe

Jinga

Antohe

et al. 2021

Sensors

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“…The silver has higher sensitivity (11532 %/RIU) compared to Au (6383 %/RIU). Different multilayer approaches have evolved so far to utilize the optical properties of Ag by providing a thin and dense protective layer of Au [43][44][45], Pt [46][47][48], dielectric layer [49,50], or self-assembled monolayer [51]. However, there is still enough space for researchers to explore.…”

Section: Motivationmentioning

confidence: 99%

“…In this thesis, we investigated the possibility of using noble metals such as Au and Pt as a protective capping layer for Ag due to the higher stability of these metals. More than that, the theoretical studies of Au [44,[52][53][54][55][56][57][58][59][60] and Pt [46][47][48] show excellent SPR responses. Because of the higher chemical resistance, designing a bimetallic SPR sensor with Au and Pt as a protective layer can improve the stability of the sensor chip in these corrosive environments.…”

Section: Aim and Scope Of This Thesismentioning

confidence: 99%

“…On the other hand, Au is widely applied in commercial sensors because of many of its excellent features such as good chemical resistance, better stability, higher Authiol interaction, and higher shift of resonance angle for a given change of refractive index [16]. Different multilayer approaches have evolved so far to utilize the optical properties of Ag by providing a thin and dense protective layer of Au [43][44][45], Pt [46,47][ [46][47][48], dielectric layer [49,50], or self-assembled monolayer [51].…”

Section: • Sensitivitymentioning

confidence: 99%

“…The theoretical studies of Pt as a capping layer on Ag, Au, Cu, and indium tin oxide (ITO) for fibre optic SPR sensors are reported [46][47][48]. They investigated the effect of Pt capping layer thickness on the sensitivity of the sensors.…”

Section: 7mentioning

confidence: 99%

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Bimetallic structures to enhance the performance of surface plasmon resonance sensors

Babu¹

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Surface plasmon resonance (SPR) sensing is a label−free and rapid detection method and has extensive applications in the field of medical diagnostics, food control, and environmental monitoring. However, the lack of sensitivity to detect small molecules is a continuing concern in the application of this technique. Past research has explored different plasmonic structures such as metal nanoparticles, metallic nanoslits, nanoholes, colloidal Au nanoparticles, 2D nanomaterials, and multilayer structures as the sensing layer to improve the sensitivity of these sensors. However, the sensitivity improvement could be realised only with the cost of the increased complexity of optical configuration and sensor chip fabrication. Silver (Ag) is a very good candidate as the metallic layer for the sensor chip due to its higher electrical conductivity as compared to gold (Au). Besides cost−effectiveness, Ag thin film based sensors have better sensitivity with a sharp resonance dip and a high signal−to−noise ratio. However, the poor chemical stability of Ag thin films prevents their use in practical applications. Noble metals such as Au and platinum (Pt) offer greatly enhanced chemical stability. This work investigated the development of SPR sensors composed of a silver−noble metal bilayer structure to utilize both the sensitivity of silver and the chemical stability of the noble metal. To enable this research, an automated experimental SPR testbed for sensor characterisation was designed and constructed. This testbed is based on the Kretschmann configuration, using a He−Ne laser source at 632.8 nm. SPR sensor consisting of multilayer metal structures was fabricated using standard microelectronic fabrication techniques. The influence of the relative thickness of a noble metal capping layer on the SPR response and sensitivity from the Ag layer was systematically optimised, using both theoretical and experimental approaches. A theoretical analysis of the performance of the bimetallic SPR sensors was done using the transfer matrix method (TMM) by assuming a five−layer configuration. In the case of an Au capping layer, these simulations indicate an optimised thickness of 45 nm for Ag and 5 nm for Au. The observation from experimental analysis of different thickness combinations of Ag and Au matched the simulated results. However, the results of the stability studies exclude the practical use of 45 nm Ag/5 nm Au structures, as long−term degradation of the Ag layer occurs. A structure of 40 nm Ag/10nm Au was thus selected as the best composition for sensor applications. It is showed that sensors fabricated with this structure showed enhanced sensitivity compared to single−layer Au sensors, with a sensitivity 50% higher than that of the single−layer Au sensor. In the case of Ag/Pt structures, simulations indicated enhanced sensitivity from a 10 nm Ag/16 nm Pt structure. However, experimental measurements did not show any evidence for SPP excitation of Pt at the measured wavelength of 632.8 nm, making it unsuitable as a capping layer in our studies. The application of 40 nm Ag/10 nm Au bimetal layers as biosensors was done by the immobilization of thiol−terminated vitamin B12 aptamers on the Au sensor surface. However, the results were not reproducible, and more work on the binding kinetics of this aptamer will need to be performed to use this in a biosensor structure.

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Biosensors for Detection of Marine Toxins

et al. 2020

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Surface plasmon resonance based fiber optic sensor using an additional layer of platinum: A theoretical study

Cited by 30 publications

References 24 publications

Sensitive pH Monitoring Using a Polyaniline-Functionalized Fiber Optic—Surface Plasmon Resonance Detector

Sensitive pH Monitoring Using a Polyaniline-Functionalized Fiber Optic—Surface Plasmon Resonance Detector

Bimetallic structures to enhance the performance of surface plasmon resonance sensors

Biosensors for Detection of Marine Toxins

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