An Optical Fiber Sensor for Hg2+ Detection Based on the LSPR of Silver and Gold Nanoparticles Embedded in a Polymeric Matrix as an Effective Sensing Material

Martínez-Hernández, María Elena; Sandua, Xabier; Rivero, Pedro J.; Goicoechea, Javier; Arregui, Francisco J.

doi:10.3390/csac2021-10633

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…In addition, this nanofabrication technique makes it possible to obtain thin films with a good control of the resultant thickness in the nanometric range, which acts as a function of operational parameters, such as pH, ionic strength, or the number of bilayers deposited [36,37]. The novelty of this work is the possibility of introducing two different metallic nanoparticles, such as AgNPs and AuNPs, into LbL films, making it possible to obtain two different LSPR sensing signals for the detection of both mercury [38] and hydrogen peroxide, respectively, in an aqueous medium. Firstly, an initial study is performed with glass slides in order to optimize the nanofabrication technique, and secondly, the sensing coating is implemented onto the optical fiber.…”

Section: Introductionmentioning

confidence: 99%

Self-Referenced Optical Fiber Sensor Based on LSPR Generated by Gold and Silver Nanoparticles Embedded in Layer-by-Layer Nanostructured Coatings

et al. 2022

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In this work, an optical fiber sensor based on the localized surface plasmon resonance (LSPR) phenomenon has been designed for the detection of two different chemical species (mercury and hydrogen peroxide) by using Layer-by-Layer Embedding (LbL-E) as a nanofabrication technique. In the first step, silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) have been synthesized by using a chemical protocol as a function of the strict control of three main parameters, which were polyelectrolyte concentration, a loading agent, and a reducing agent. In the second step, their incorporation into nanometric thin films have been demonstrated as a function of the number of bilayers, which shows two well-located absorption peaks associated to their LSPR in the visible region at 420 nm (AgNPs) and 530 nm (AuNPs). Finally, both plasmonic peaks provide a stable real-time reference measurement, which can be extracted from the spectral response of the optical fiber sensor, which shows a specific sensing mechanism as a function of the analyte of study.

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Section: Introductionmentioning

confidence: 99%

Self-Referenced Optical Fiber Sensor Based on LSPR Generated by Gold and Silver Nanoparticles Embedded in Layer-by-Layer Nanostructured Coatings

et al. 2022

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Cost‐Effective and Robust Multispectral Light‐Emitting Diode Device for the Readout of Plasmonic Microarray Sensors

Kastner

Urban

Dietel

et al. 2022

Advanced Photonics Research

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Localized surface plasmon resonance (LSPR) is a phenomenon known for more than 100 years, which arises from the interaction of light with metallic nanoparticles. In recent years, the field of LSPR sensing has become increasingly important in bioanalytics. Herein, a simple and robust device setup to perform time‐resolved LSPR measurements with inexpensive array sensor chips is presented. For this purpose, gold nanoparticles are spotted onto glass substrates under different conditions (droplet size/number, temperature, and humidity) to achieve an optimal signal‐to‐noise ratio. To verify the setup and the spotted sensor chips, bulk sensitivity measurements with solutions of varying refractive index and surface sensitivity measurements with layer‐by‐layer (LbL) deposition are performed. It is shown that slower drying minimizes the edge effects of ring‐like deposits (coffee ring effect) and that the spots with higher particle densities are more suitable for sensor applications. In general, the use of six light‐emitting diode (LEDs) enables a simple centroid calculation as well as an evaluation via individual LED intensities. The presented cost‐effective system allows parallel reading of more than 100 spots in a label‐free platform, and together with the optimized low‐cost sensors, it provides an interesting alternative for the development of future on‐site diagnostics.

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Comparing silver and gold nanoislands’ surface plasmon resonance for bisacodyl and its metabolite quantification in human plasma

Kelani,

Ibrahim,

Ramadan

et al. 2024

BMC Chemistry

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Gold and silver nanoparticles have witnessed increased scientific interest due to their colourful colloidal solutions and exceptional applications. Comparing the localized surface plasmon resonance (LSPR) of gold and silver nanoparticles is crucial for understanding and optimizing their optical properties. This comparison informs the design of highly sensitive plasmonic sensors, aids in selecting the most suitable nanoparticles for applications like surface-enhanced infrared spectroscopy (SEIRA) and biomedical imaging, and guides the choice between gold and silver nanoparticles based on their catalytic and photothermal properties. Ultimately, the study of LSPR facilitates the tailored use of these nanoparticles in diverse scientific and technological applications. Two SEIRA methods combined with partial least squares regression (PLSR) chemometric tools were developed. This development is based on the synthesis of homogeneous, high-dense deposited metal nanoparticle islands over the surface of glass substrates to be used as lab-on-chip SEIRA sensors for the determination of bisacodyl (BIS) and its active metabolite in plasma. SEM micrographs revealed the formation of metallic islands of colloidal citrate-capped gold and silver nanoparticles of average sizes of 29.7 and 15 nm, respectively. BIS and its active metabolite were placed on the nanoparticles’ coated substrates to be directly measured, then PLSR chemometric modelling was used for the quantitative determinations. Plasmonic citrate-capped gold nanoparticle substrates showed better performance than those prepared using citrate-capped silver nanoparticles in terms of preparation time, enhancement factor, PLSR model prediction, and quantitative results. This study offers a way to determine BIS and its active metabolite in the concentration range 15–240 ng/mL in human plasma using inexpensive disposable glass-coated substrates that can be prepared in 1 h to get results in seconds with good recovery between 98.77 and 100.64%. The sensors provided fast, simple, selective, molecular-specific and inexpensive procedures to determine molecules in their pure form and biological fluid.

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An Optical Fiber Sensor for Hg2+ Detection Based on the LSPR of Silver and Gold Nanoparticles Embedded in a Polymeric Matrix as an Effective Sensing Material

Cited by 3 publications

References 18 publications

Self-Referenced Optical Fiber Sensor Based on LSPR Generated by Gold and Silver Nanoparticles Embedded in Layer-by-Layer Nanostructured Coatings

Self-Referenced Optical Fiber Sensor Based on LSPR Generated by Gold and Silver Nanoparticles Embedded in Layer-by-Layer Nanostructured Coatings

Cost‐Effective and Robust Multispectral Light‐Emitting Diode Device for the Readout of Plasmonic Microarray Sensors

Comparing silver and gold nanoislands’ surface plasmon resonance for bisacodyl and its metabolite quantification in human plasma

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