scholarly journals Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers’ Stability

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 70
Author(s):  
Maria Raposo ◽  
Carlota Xavier ◽  
Catarina Monteiro ◽  
Susana Silva ◽  
Orlando Frazão ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Layer By Layer ◽  
Film Stability ◽  
A Value ◽  
Device Reliability ◽  
Sensor Devices ◽  
Lbl Films ◽  
The Stability

Thin graphene oxide (GO) film layers are being widely used as sensing layers in different types of electrical and optical sensor devices. GO layers are particularly popular because of their tuned interface reflectivity. The stability of GO layers is fundamental for sensor device reliability, particularly in complex aqueous environments such as wastewater. In this work, the stability of GO layers in layer-by-layer (LbL) films of polyethyleneimine (PEI) and GO was investigated. The results led to the following conclusions: PEI/GO films grow linearly with the number of bilayers as long as the adsorption time is kept constant; the adsorption kinetics of a GO layer follow the behavior of the adsorption of polyelectrolytes; and the interaction associated with the growth of these films is of the ionic type since the desorption activation energy has a value of 119 ± 17 kJ/mol. Therefore, it is possible to conclude that PEI/GO films are suitable for application in optical fiber sensor devices; most importantly, an optical fiber-based interrogation setup can easily be adapted to investigate in situ desorption via a thermally stimulated process. In addition, it is possible to draw inferences about film stability in solution in a fast, reliable way when compared with the traditional ones.

scholarly journals Polyelectrolyte Based Sensors as Key to Achieve Quantitative Electronic Tongues: Detection of Triclosan on Aqueous Environmental Matrices

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 640
Author(s):  
Cátia Magro ◽  
Paulo Zagalo ◽  
João Pereira-da-Silva ◽  
Eduardo Pires Mateus ◽  
Alexandra Branco Ribeiro ◽  
...  
Keyword(s):  
Continuous Monitoring ◽  
Mineral Water ◽  
Electronic Tongue ◽  
Principal Component ◽  
Electrical Impedance Spectroscopy ◽  
Layer By Layer ◽  
Environmental Matrices ◽  
Film Stability ◽  
Lbl Films ◽  
Water And Wastewater

Triclosan (TCS) is a bacteriostatic used in household items that promotes antimicrobial resistance and endocrine disruption effects both to humans and biota, raising health concerns. In this sense, new devices for its continuous monitoring in complex matrices are needed. In this work, sensors, based on polyelectrolyte layer-by-layer (LbL) films prepared onto gold interdigitated electrodes (IDE), were studied. An electronic tongue array, composed of (polyethyleneimine (PEI)/polysodium 4-styrenesulfonate (PSS))5 and (poly(allylamine hydrochloride/graphene oxide)5 LbL films together with gold IDE without coating were used to detect TCS concentrations (10−15–10−5 M). Electrical impedance spectroscopy was used as means of transduction and the obtained data was analyzed by principal component analysis (PCA). The electronic tongue was tested in deionized water, mineral water and wastewater matrices showing its ability to (1) distinguish between TCS doped and non-doped solutions and (2) sort out the TCS range of concentrations. Regarding film stability, strong polyelectrolytes, as (PEI/PSS)n, presented more firmness and no significant desorption when immersed in wastewater. Finally, the PCA data of gold IDE and (PEI/PSS)5 sensors, for the mineral water and wastewater matrices, respectively, showed the ability to distinguish both matrices. A sensitivity value of 0.19 ± 0.02 per decade to TCS concentration and a resolution of 0.13 pM were found through the PCA second principal component.

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

2021 ◽  
Vol 5 (1) ◽  
pp. 73
Author(s):  
María Elena Martínez-Hernández ◽  
Xabier Sandua ◽  
Pedro J. Rivero ◽  
Javier Goicoechea ◽  
Francisco J. Arregui
Keyword(s):  
Gold Nanoparticles ◽  
Optical Fiber ◽  
Localized Surface Plasmon Resonance ◽  
Spectral Response ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Localized Surface Plasmon ◽  
Layer By Layer ◽  
Sensing Material ◽  
Reliable Monitoring

In this work, an optical fiber sensor based on the localized surface plasmon resonance (LSPR) phenomenon is presented as a powerful tool for the detection of heavy metals (Hg2+). The resultant sensing film was fabricated using a nanofabrication process, known as layer-by-layer embedding (LbL-E) deposition technique. In this sense, both silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) were synthesized using a synthetic chemical protocol as a function of a strict control of three main parameters: polyelectrolyte concentration, loading agent, and reducing agent. The use of metallic nanostructures as sensing materials is of great interest because well-located absorption peaks associated with their LSPR are obtained at 420 nm (AgNPs) and 530 nm (AuNPs). Both plasmonic peaks provide a stable real-time reference that can be extracted from the spectral response of the optical fiber sensor, giving a reliable monitoring of the Hg2+ concentration.

scholarly journals Self-Referenced Optical Fiber Sensor for Hydrogen Peroxide Detection based on LSPR of Metallic Nanoparticles in Layer-by-Layer Films

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3872 ◽  
Author(s):  
Goicoechea ◽  
Rivero ◽  
Sada ◽  
Arregui
Keyword(s):  
Hydrogen Peroxide ◽  
Optical Fiber ◽  
Metallic Nanoparticles ◽  
Low Cost ◽  
Spectral Response ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Localized Surface Plasmon ◽  
Layer By Layer ◽  
Robust Detection

Intensity-based optical fiber sensors are one of the most studied sensor approaches thanks to their simplicity and low cost. Nevertheless, their main issue is their lack of robustness since any light source fluctuation, or unexpected optical setup variation is directly transferred to the output signal, which, significantly reduces their reliability. In this work, a simple and robust hydrogen peroxide (H2O2) optical fiber sensor is proposed based on the Localized Surface Plasmon Resonance (LSPR) sensitivity of silver and gold metallic nanoparticles. The precise and robust detection of H2O2 concentrations in the ppm range is very interesting for the scientific community, as it is a pathological precursor in a wide variety of damage mechanisms where its presence can be used to diagnose important diseases such as Parkinson’s disease, diabetes, asthma, or even Alzheimer’s disease). In this work, the sensing principle is based the oxidation of the silver nanoparticles due the action of the hydrogen peroxide, and consequently the reduction of the efficiency of the plasmonic coupling. At the same time, gold nanoparticles show a high chemical stability, and therefore provide a stable LSPR absorption band. This provides a stable real-time reference that can be extracted from the spectral response of the optical fiber sensor, giving a reliable reading of the hydrogen peroxide concentration.

scholarly journals Acoustic Optical Fiber Sensor Based on Graphene Oxide Membrane

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2336
Author(s):  
Catarina S. Monteiro ◽  
Maria Raposo ◽  
Paulo A. Ribeiro ◽  
Susana O. Silva ◽  
Orlando Frazão
Keyword(s):  
Graphene Oxide ◽  
Signal To Noise Ratio ◽  
Optical Cavity ◽  
Optical Fiber Sensor ◽  
Signal Amplitude ◽  
Chemical Hazards ◽  
Fabry Perot ◽  
Fabrication Procedure ◽  
The Stability ◽  
Oxide Membrane

A Fabry–Pérot acoustic sensor based on a graphene oxide membrane was developed with the aim to achieve a faster and simpler fabrication procedure when compared to similar graphene-based acoustic sensors. In addition, the proposed sensor was fabricated using methods that reduce chemical hazards and environmental impacts. The developed sensor, with an optical cavity of around 246 µm, showed a constant reflected signal amplitude of 6.8 ± 0.1 dB for 100 nm wavelength range. The sensor attained a wideband operation range between 20 and 100 kHz, with a maximum signal-to-noise ratio (SNR) of 32.7 dB at 25 kHz. The stability and sensitivity to temperatures up to 90 °C was also studied. Moreover, the proposed sensor offers the possibility to be applied as a wideband microphone or to be applied in more complex systems for structural analysis or imaging.

scholarly journals Dengue E protein detection using graphene oxide integrated tapered optical fiber sensor

2018 ◽  
pp. 1-1 ◽  
Author(s):  
Yasmin Mustapha Kamil ◽  
Muhammad Hafiz Abu Bakar ◽  
Amir Syahir Amir Hamzah ◽  
Mohd Hanif Yaacob ◽  
Lim Hong Ngee ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Protein Detection ◽  
Fiber Sensor ◽  
E Protein ◽  
Tapered Optical Fiber

Absorbance response of a graphene oxide coated U-bent optical fiber sensor for aqueous ethanol detection

RSC Advances ◽  
2016 ◽  
Vol 6 (19) ◽  
pp. 15808-15815 ◽  
Author(s):  
S. S. Gao ◽  
H. W. Qiu ◽  
C. Zhang ◽  
S. Z. Jiang ◽  
Z. Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Optical Fiber ◽  
Aqueous Ethanol ◽  
Dynamic Change ◽  
Optical Fiber Sensor ◽  
Fiber Sensor

In this work, the dynamic change of the absorbance for aqueous ethanol detection based on a graphene oxide coated U-bent optical fiber sensor was investigated.

Simultaneous Measurement of Humidity and Temperature with Cytop-reduced Graphene Oxide-overlaid Two-mode Optical Fiber Sensor

2019 ◽  
Vol 298 ◽  
pp. 126841 ◽  
Author(s):  
Anh Duy Duong Le ◽  
Juil Hwang ◽  
Mohammad Yusuf ◽  
Kang Hyun Park ◽  
Sungkyun Park ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Optical Fiber ◽  
Reduced Graphene Oxide ◽  
Simultaneous Measurement ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Reduced Graphene

scholarly journals Tuning of Fiber Optic Surface Reflectivity through Graphene Oxide-Based Layer-by-Layer Film Coatings

Photonics ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 11
Author(s):  
Catarina S. Monteiro ◽  
Maria Raposo ◽  
Paulo A. Ribeiro ◽  
Susana O. Silva ◽  
Orlando Frazão
Keyword(s):  
Graphene Oxide ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Growth Kinetics ◽  
Fiber Optic ◽  
Hollow Microsphere ◽  
Layer Growth ◽  
Layer By Layer ◽  
Film Coatings ◽  
Surface Reflectivity

The use of graphene oxide-based coatings on optical fibers are investigated, aiming to tune the reflectivity of optical fiber surfaces for use in precision sensing devices. Graphene oxide (GO) layers are successfully deposited onto optical fiber ends, either in cleaved or hollow microspheres, by mounting combined bilayers of polyethylenimine (PEI) and GO layers using the Layer-by-Layer (LbL) technique. The reflectivity of optical fibers coated with graphene oxide layers is investigated for the telecom region allowing to both monitor layer growth kinetics and cavity characterization. Tunable reflective surfaces are successfully attained in both cleaved optical fibers and hollow microsphere fiber-based sensors by simply coating them with PEI/GO layers through the LbL film technique.

scholarly journals Hybrid layer-by-layer (LbL) films of polyaniline, graphene oxide and zinc oxide to detect ammonia

2017 ◽  
Vol 238 ◽  
pp. 795-801 ◽  
Author(s):  
Rafaela S. Andre ◽  
Flávio M. Shimizu ◽  
Celina M. Miyazaki ◽  
Antonio Riul ◽  
Danilo Manzani ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
Layer By Layer ◽  
Hybrid Layer ◽  
Lbl Films

Graphene Oxide Effect on Improvement of Silver Surface Plasmon Resonance D-Shaped Optical Fiber Sensor

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Iraj S. Amiri ◽  
Siti Anis Khairani Alwi ◽  
Sofiah Atirah Raya ◽  
Nur Aina’a Mardhiah Zainuddin ◽  
Nurul Syazwani Rohizat ◽  
...  
Keyword(s):  
Refractive Index ◽  
Graphene Oxide ◽  
Surface Plasmon Resonance ◽  
Optical Fiber ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Silver Coating ◽  
Silver Surface

AbstractThis research focuses on the side-polished Single-Mode Optical Fibers (SMOF) as refractive index (RI) sensor utilizing properties of Surface Plasmon Resonance. The SMOF with cladding stripped off shows a D-shaped optical fiber with high sensitivity functionalization. Here we show silver protected by graphene oxide (GO) as viable candidates. A few layers of GO on top of silver thin layer were applied as a material to overcome silver coating degradation process. This silver/GO sensor was characterized using various RIs of analyte likely deionized water and alcohol solutions. Sensor with GO has shown fast response and high sensitivity in respect of RI, where sensitivity increases in range from 1.30 to 1.34 RIU (refractive index unit). This device shows highest sensitivity of up to 833.33 nm/ RIU. The polishing process using SMOF stops at few microns above the core of the fiber with the drop of output power fixed to be 1 dB as an indication to standardize the amount of cladding been removed. The thickness of 30 nm Ag was deposited using electron beam evaporation method on D-shaped optical fiber with subsequent protected layer of GO in solutions form. The use of COMSOL Multiphysics has also been carried out to observe numerical findings. The response of the GO has shown a sensitivity improvement which proves new promising approaches for the newly developed sensors.

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