Concentration sensor with multilayer thin film-coupled surface plasmon resonance

A novel vanadium–cellulose composite thin film-based on angular interrogation surface plasmon resonance (SPR) sensor for ppb-level detection of Ni(II) ion was developed. Experimental results show that the sensor has a linear response to the Ni(II) ion concentrations in the range of 2–50 ppb with a determination coefficient (R2) of 0.9910. This SPR sensor can attain a maximum sensitivity (0.068° ppb−1), binding affinity constant (1.819 × 106 M−1), detection accuracy (0.3034 degree−1), and signal-to-noise-ratio (0.0276) for Ni(II) ion detection. The optical properties of thin-film targeting Ni(II) ions in different concentrations were obtained by fitting the SPR reflectance curves using the WinSpall program. All in all, the proposed Au/MPA/V–CNCs–CTA thin-film-based surface plasmon resonance sensor exhibits better sensing performance than the previous film-based sensor and demonstrates a wide and promising technology candidate for environmental monitoring applications in the future.

Download Full-text

Optical and surface plasmon resonance sensing properties for chitosan/carboxyl-functionalized graphene quantum dots thin film

Optik ◽

10.1016/j.ijleo.2018.10.071 ◽

2019 ◽

Vol 178 ◽

pp. 802-812 ◽

Cited By ~ 22

Author(s):

Nur Syahira Md Ramdzan ◽

Yap Wing Fen ◽

Nur Alia Sheh Omar ◽

Nur Ain Asyiqin Anas ◽

Wan Mohd Ebtisyam Mustaqim Mohd Daniyal ◽

...

Keyword(s):

Thin Film ◽

Quantum Dots ◽

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Graphene Quantum Dots ◽

Functionalized Graphene ◽

Sensing Properties

Download Full-text

A Wedge-Shaped Au Thin Film: Integrating Multiple Surface Plasmon Resonance Sensors in a Single Chip and Enhancing the Figure of Merit

Frontiers in Nanotechnology ◽

10.3389/fnano.2021.724528 ◽

2021 ◽

Vol 3 ◽

Author(s):

Hiromasa Shimizu ◽

Takahiro Ogura ◽

Takumi Maeda ◽

Shogo Suzuki

Keyword(s):

Thin Film ◽

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Figure Of Merit ◽

Refractive Index Change ◽

Electron Beam Evaporation ◽

Attenuated Total Reflection ◽

Single Chip ◽

Au Thin Film

We show here the design, fabrication, and characterization of a wedge-shaped Au thin film with an enhanced figure of merit (FOM). This is achieved by using a reflectivity change in an attenuated total reflection (ATR) setup by slightly modulating the wavenumber of the surface plasmon polariton by means of the varying thickness of the Au thin film. The wedge-shaped Au thin film is equivalent to multiple surface plasmon resonance (SPR) transducers integrated in a single chip and was fabricated by an electron-beam evaporation process with the position of the shutter controlled during the deposition. The FOM, defined as the difference between the maximum and minimum values of the normalized reflectivity change (ΔR/R) divided by the corresponding difference of the incident angles, was 8.0-times larger than that based on the reflectivity R. Also, we demonstrated that the wedge-shaped Au thin film was able to detect ethanol gas at a concentration of 0.2%, corresponding to a refractive index change of 2 × 10−5, without any surface functionalization. Since the sensing signal can be obtained with a single image from the wedge-shaped Au thin film without precise thickness control of the metal thickness, no other materials or modulation equipment is necessary, and the sensing chip can be employed in simple and highly sensitive systems.

Download Full-text

Development of an Au/ZnO thin film surface plasmon resonance-based biosensor immunoassay for the detection of carbohydrate antigen 15‐3 in human saliva

Clinical Biochemistry ◽

10.1016/j.clinbiochem.2012.09.001 ◽

2012 ◽

Vol 45 (18) ◽

pp. 1689-1693 ◽

Cited By ~ 27

Author(s):

Yang-Hung Liang ◽

Chia-Chen Chang ◽

Chien-Cheng Chen ◽

Yu Chu-Su ◽

Chii-Wann Lin

Keyword(s):

Thin Film ◽

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Film Surface ◽

Human Saliva ◽

Carbohydrate Antigen ◽

Zno Thin Film ◽

Thin Film Surface

Download Full-text

Nanostructured Chitosan/Maghemite Composites Thin Film for Potential Optical Detection of Mercury Ion by Surface Plasmon Resonance Investigation

Polymers ◽

10.3390/polym12071497 ◽

2020 ◽

Vol 12 (7) ◽

pp. 1497

Author(s):

Nurul Illya Muhamad Fauzi ◽

Yap Wing Fen ◽

Nur Alia Sheh Omar ◽

Silvan Saleviter ◽

Wan Mohd Ebtisyam Mustaqim Mohd Daniyal ◽

...

Keyword(s):

Thin Film ◽

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Mercury Ion ◽

Resonance Spectroscopy ◽

Force Microscopy ◽

Sensing Applications ◽

Atomic Force ◽

Fe2o3 Thin Film

In this study, synthesis and characterization of chitosan/maghemite (Cs/Fe2O3) composites thin film has been described. Its properties were characterized using Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM) and ultraviolet-visible spectroscopy (UV-Vis). FTIR confirmed the existence of Fe–O bond, C–N bond, C–C bond, C–O bond, O=C=O bond and O–H bond in Cs/Fe2O3 thin film. The surface morphology of the thin film indicated the relatively smooth and homogenous thin film, and also confirmed the interaction of Fe2O3 with the chitosan. Next, the UV-Vis result showed high absorbance value with an optical band gap of 4.013 eV. The incorporation of this Cs/Fe2O3 thin film with an optical-based method, i.e., surface plasmon resonance spectroscopy showed positive response where mercury ion (Hg2+) can be detected down to 0.01 ppm (49.9 nM). These results validate the potential of Cs/Fe2O3 thin film for optical sensing applications in Hg2+ detection.

Download Full-text