A Sensitive and Stable Surface Plasmon Resonance Sensor Based on Monolayer Protected Silver Film

Wang, Guiqiang; Wang, Chunnan; Yang, Rui; Liu, Wenlan; Sun, Shuqing

doi:10.3390/s17122777

Cited by 76 publications

(34 citation statements)

References 55 publications

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“…Ag suffers from oxidation and sulfuration, which limits some of its SPR performance. However, a recent study shows that Ag demonstrates better field enhancement and penetration depth in comparison to Au by 5 and 1.4 times, respectively [19], resulting in the better sensitivity of the sensors. In another report, Homola and co-workers [20] demonstrated that the propagation length for Ag is approximately twice that of Au in near-infrared region wavelengths, which shows its intrinsic sensitivity enhancement over Au.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Enhancement of Pb(II) Ion Detection in Rivers Using SPR-Based Ag Metallic Layer Coated with Chitosan–Graphene Oxide Nanocomposite

Lokman

Azeman

Sujá

et al. 2019

Sensors

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The detection of Pb(II) ions in a river using the surface plasmon resonance (SPR)-based silver (Ag) thin film technique was successfully developed. Chitosan–graphene oxide (CS-GO) was coated on top of the Ag thin film surface and acted as the active sensing layer for Pb(II) ion detection. CS-GO was synthesized and characterized, and the physicochemical properties of this material were studied prior to integration with the SPR. In X-ray photoelectron spectroscopy (XPS), the appearance of the C=O, C–O, and O–H functional groups at 531.2 eV and 532.5 eV, respectively, confirms the success of CS-GO nanocomposite synthesis. A higher surface roughness of 31.04 nm was observed under atomic force microscopy (AFM) analysis for Ag/CS-GO thin film. The enhancement in thin film roughness indicates that more adsorption sites are available for Pb(II) ion binding. The SPR performance shows a good sensor sensitivity for Ag/CS-GO with 1.38° ppm−1 ranging from 0.01 to 5.00 ppm of standard Pb(II) solutions. At lower concentrations, a better detection accuracy was shown by SPR using Ag/CS-GO thin film compared to Ag/CS thin film. The SPR performance using Ag/CS-GO thin film was further evaluated with real water samples collected from rivers. The results are in agreement with those of standard Pb(II) ion solution, which were obtained at incidence angles of 80.00° and 81.11° for local and foreign rivers, respectively.

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Section: Introductionmentioning

confidence: 99%

Sensitivity Enhancement of Pb(II) Ion Detection in Rivers Using SPR-Based Ag Metallic Layer Coated with Chitosan–Graphene Oxide Nanocomposite

Lokman

Azeman

Sujá

et al. 2019

Sensors

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“…Surface plasmon resonance (SPR) [11] experiments were performed using the Biacore T200 system (GE Healthcare, Milan, Italy). Both antibodies (anti- E. coli and anti-HSA) were immobilized onto a Biacore sensor chip C1 consisting of a gold surface coated by a thin carboxylated layer.…”

Section: Methodsmentioning

confidence: 99%

Dark Field Microscopy-Based Biosensors for the Detection of E. coli in Environmental Water Samples

Spina

António

Desmet

et al. 2019

Sensors

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Development of sensitive methods for the determination of E. coli bacteria contamination in water distribution systems is of paramount importance to ensure the microbial safety of drinking water. This work presents a new sensing platform enabling the fast detection of bacteria in field samples by using specific antibodies as the biorecognition element and dark field microscopy as the detection technique. The development of the sensing platform was performed using non-pathogenic bacteria, with the E. coli DH5α strain as the target, and Bacillus sp. 9727 as the negative control. The identification of the captured bacteria was made by analyzing the dark field microscopy images and screening the detected objects by using object circularity and size parameters. Specificity tests revealed the low unspecific attachment of either E. coli over human serum albumin antibodies (negative control for antibody specificity) and of Bacillus sp. over E. coli antibodies. The system performance was tested using field samples, collected from a wastewater treatment plant, and compared with two quantification techniques (i.e., Colilert-18 test and quantitative polymerase chain reaction (qPCR)). The results showed comparable quantification capability. Nevertheless, the present method has the advantage of being faster, is easily adaptable to in-field analysis, and can potentially be extended to the detection of other bacterial strains.

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“…Further, the SPR excitation using Ag as the plasmonic metal layer face the challenge of oxidation under air exposure which reduced the sensor sensitivity and limit their applications [66,67]. Compared to conventional Au-based SPR sensors, Ag-based SPR sensors produce higher sensitivity with a sharp dip in the SPR curve with smaller FWHM value.…”

Section: Zno For Sensitivity Enhancementmentioning

confidence: 99%

ZnO for performance enhancement of surface plasmon resonance biosensor: a review

Mei

Menon

Hegde³

2020

Mater. Res. Express

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This paper reviews Kretschmann-based SPR sensor utilizing ZnO thin films and nanostructures for performance enhancement. The advancement in surface plasmon resonance technology relies on low-cost, high sensitivity and high selectivity sensor. Metal oxide has been incorporated in SPR sensor to be used for detection of biological and chemical compounds. ZnO as one of the metal oxides is an attractive material due to its unique physical and optical properties. Numerous techniques for fabrication and characterization of ZnO on SPR gold substrate have been studied. The mechanism for gas and biomolecules detection depends on their interaction with ZnO surface, which is mainly attributed to the high isoelectric point of ZnO. There are several types of ZnO nanostructures which have been employed for SPR application based on the Kretschmann configuration. In future, the thin film and nanostructures of ZnO have potential applications for miniature design, robust, high sensitivity, and low-cost portable type of SPR biosensor to be used for on-site testing in real-time and label-free manner.

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A Sensitive and Stable Surface Plasmon Resonance Sensor Based on Monolayer Protected Silver Film

Cited by 76 publications

References 55 publications

Sensitivity Enhancement of Pb(II) Ion Detection in Rivers Using SPR-Based Ag Metallic Layer Coated with Chitosan–Graphene Oxide Nanocomposite

Sensitivity Enhancement of Pb(II) Ion Detection in Rivers Using SPR-Based Ag Metallic Layer Coated with Chitosan–Graphene Oxide Nanocomposite

Dark Field Microscopy-Based Biosensors for the Detection of E. coli in Environmental Water Samples

ZnO for performance enhancement of surface plasmon resonance biosensor: a review

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