Article
Chemistry, Analytical
Ignacio Vitoria, Elieser E. Gallego, Sonia Melendi-Espina, Miguel Hernaez, Carlos Ruiz Zamarreno, Ignacio R. Matias
Summary: In this work, the combination of LMR-based sensing technology on planar waveguides and the use of a GO thin film as a sensitive coating is presented to monitor ethanol, water, and acetone. Experimental results showed a sensitivity of 3.1, 2.0, and 0.6 pm/ppm for ethanol, water, and acetone respectively, with a linearity factor R-2 > 0.95 in all cases.
Article
Engineering, Electrical & Electronic
Sukanya Choudhary, Flavio Esposito, Lucia Sansone, Michele Giordano, Stefania Campopiano, Agostino Iadicicco
Summary: This study demonstrates the generation of lossy mode resonances (LMRs) using an unconventional optical fiber, eliminating the need for an external high refractive index thin film. A few centimeters of a commercially available double cladding fiber (DCF) with a W-type refractive index (RI) profile is spliced between two multimode fibers, allowing for the induction and tuning of LMR phenomenon. The LMR-based fiber sensor developed in this study offers advantages in terms of simplicity, cost, and stability compared to thin-film coated optical fibers. It exhibits a high sensitivity of up to 1700 nm/RIU in the RI range of 1.33-1.39, making it suitable for bio-chemical sensing applications, with low cross sensitivity to temperature.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Omar Fuentes, Jesus M. Corres, Ismel Dominguez, Ignacio Del Villar, Ignacio R. Matias
Summary: This work presents a new sensor structure for simultaneous measurement of temperature and refractive index. The sensor uses a soda-lime coverslip coated with a CuO thin film and a PDMS thick layer to generate two separated lossy mode resonances. One resonance is used for temperature measurement, while the other is used for sensing refractive index. Calibration tests were conducted using calibrated oil series.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Multidisciplinary
Emil Pitula, Monika Janik, Petr Sezemsky, Katarzyna Patrycja Szymanska, Marcin Olszewski, Vitezslav Stranak, Marcin Koba, Mateusz Smietana
Summary: In this study, a smartphone-based spectrometer is used for dynamic analysis of the optical response of an electro-optically modulated lossy-mode resonance (LMR) optical fiber sensor. By coating a section of the fiber core with a fluorine-doped tin oxide (FTO) thin film, the LMR is achieved and the FTO is used as an electrochemical electrode. The smartphone-based spectrometer is capable of dynamically measuring the change in charge carriers in the FTO when an electrical potential is applied to the sensor, with a time resolution below 0.5 s. Furthermore, the system demonstrates high sensitivity in detecting low concentrations of GFP, making it suitable for various biosensing applications.
Article
Engineering, Electrical & Electronic
P. I. Kuznetsov, D. P. Sudas, E. A. Savelyev
Summary: The fiber-optic sensor is capable of detecting the refractive index and molar concentration of acids and alkalis in chemically aggressive liquids. It has high chemical durability and insusceptibility to aqua regia, while also being sensitive to changes in the surrounding medium refractive index and the molar concentration of acids.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Nanoscience & Nanotechnology
Mateusz Smietana, Bartosz Janaszek, Katarzyna Lechowicz, Petr Sezemsky, Marcin Koba, Dariusz Burnat, Marcin Kieliszczyk, Vitezslav Stranak, Pawel Szczepanski
Summary: This study aims to explore the electro-optically modulated lossy-mode resonance effect observed in ITO-coated optical fiber sensors. The research found that the carrier density in the semiconducting ITO plays a crucial role in the efficiency of electrochemical processes and LMR properties.
Article
Engineering, Electrical & Electronic
Francesco Chiavaioli, Davide Janner
Summary: This review focuses on recent advances in lossy more resonance (LMR) fiber optic sensors, comparing them with surface plasmon resonance (SPR). Key parameters include geometrical configuration and supporting material. Sensing mechanisms are primarily based on refractometry, with applications ranging from electric field to pressure sensors and gas detection to biosensors, confirming the potential of LMR sensors for sensor development.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Deependra Singh Gaur, Ankit Purohit, Satyendra Kumar Mishra, Akhilesh Kumar Mishra
Summary: This study investigates resonances in different layer thickness conditions, and found that in the tri-layer configuration, a resonance insensitive to the change in the sensing medium refractive index can be obtained. Sensitivity, detection accuracy, and figure of merit of the two kinds of RI sensing probes and supported resonances have been characterized and compared, providing insights for the realization of biochemical sensing devices with a wider spectral range.
Article
Chemistry, Analytical
E. E. Gallego Martinez, I. R. Matias, S. Melendi-Espina, M. Hernaez, C. Ruiz Zamarreno
Summary: The sensitivity of gas sensing devices based on Lossy Mode Resonances (LMR) is significantly enhanced by using nanometric Graphene Oxide / Polyethyleneimine (GO/PEI) bilayers deposited onto SnO2 coated CaF2 planar waveguides. The LMR generation in the mid-infrared region, achieved with the help of fluorinated (CaF2) planar waveguides, contributes to the improved sensitivities. The number of GO/PEI bilayers affects the LMR wavelength shift, with 10 bilayers showing a 5-fold increase in sensitivity to 1-butanol compared to devices without GO/PEI bilayers. The GO/PEI sensor also exhibits sensitivity to other alcohols but negligible sensitivity to other gases, such as CO2, NH3, or C2H2. Cross sensitivity with temperature fluctuations does not affect the sensor performance during water vapor measurement.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Engineering, Electrical & Electronic
Ismel Dominguez, Jesus M. Corres, Omar Fuentes, Ignacio del Villar, Ignacio R. Matias
Summary: This work presents a new multiparameter sensor platform based on lossy mode resonances. By depositing a variable thickness thin-film on a soda-lime optical slab waveguide, multiple independent resonances can be generated and monitored using a single spectrometer. The selective narrowing of a broad resonance by etching sections of the thin film demonstrates the potential to isolate independent resonances in the same spectra, enabling multiparameter sensing. The experimental results were supported by theoretical analysis using the finite difference method. As a proof of concept, two refractometers were fabricated and tested on the same waveguide using PDMS cells. This platform has the potential to be miniaturized for low-cost integration of multiple sensors, making it attractive for the development of multi-analyte biosensor probes.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Analytical
Saad Hayatu Girei, Mohammed Majeed Alkhabet, Yasmin Mustapha Kamil, Hong Ngee Lim, Mohd Adzir Mahdi, Mohd Hanif Yaacob
Summary: An optical fiber coated with graphene oxide was developed for monitoring ammonia absorbance response at visible and near-infrared wavelengths. The study showed better performance in the near-infrared region and high sensitivity and fast response and recovery times. Additionally, the sensor exhibited selectivity towards ammonia with no response to other gases.
Article
Optics
D. Bohorquez, I. Del Villar, J. M. Corres, I. R. Matias
Summary: Copper oxide allows for lossy mode resonance in a wide wavelength range of the optical spectrum, and additional coatings of tin oxide and agarose can increase sensor sensitivity. The behavior of the sensors depends on the position of the LMR in the optical spectrum, with sensors in the NIR showing better performance in terms of sensitivity and signal quality.
OPTICS AND LASER TECHNOLOGY
(2021)
Review
Chemistry, Analytical
Ignacio Vitoria, Carlos Ruiz Zamarreno, Aritz Ozcariz, Ignacio R. Matias
Summary: Urban pollution leads to the increasing demand for gas sensors for air quality control and monitoring, while optical fiber gas sensors are being widely used in remote, confined, hostile, corrosive, or explosive environments.
Article
Chemistry, Analytical
Dmitriy P. Sudas, Leonid Yu Zakharov, Viktor A. Jitov, Konstantin M. Golant
Summary: A fiber-optic refractometer for a variety of liquids has been developed and tested. The sensor is coated with a thin silicon oxynitride film and can detect lossy mode resonance. The wavelength of the resonance depends on the refractive index of the liquid.
Article
Materials Science, Multidisciplinary
Shaokang Yan, Shengli Pu, Yuxiu Zhang, Min Yuan, Chencheng Zhang
Summary: The graphene oxide (GO) coating improved the performance of the sensor in glycerin solution, resulting in a refractive-index (RI) sensitivity of 496.823 nm/RIU. However, the GO coating reduced the magnetic field sensitivity of the sensor in magnetic fluid solution. The mechanism behind the enhanced RI sensitivity and decreased magnetic field sensitivity was clarified.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Applied
S. Melendi-Espina, R. Alvarez, M. A. Diez, M. D. Casal
FUEL PROCESSING TECHNOLOGY
(2015)
Review
Chemistry, Analytical
Miguel Hernaez, Carlos R. Zamarreno, Sonia Melendi-Espina, Liam R. Bird, Andrew G. Mayes, Francisco J. Arregui
Article
Chemistry, Analytical
Miguel Hernaez, Beatriz Acevedo, Andrew G. Mayes, Sonia Melendi-Espina
SENSORS AND ACTUATORS B-CHEMICAL
(2019)
Article
Engineering, Electrical & Electronic
Miguel Hernaez, Andrew G. Mayes, Sonia Melendi-Espina
IEEE SENSORS JOURNAL
(2019)
Article
Chemistry, Applied
G. Predeanu, S. M. Axinte, M. F. Dragoescu, Z. Gonzalez, P. Alvarez, M. Granda, R. Menendez, A. Fiti, B. Acevedo, S. Melendi-Espina, G. Gryglewicz, J. J. Fernandez, V. Slavescu
FUEL PROCESSING TECHNOLOGY
(2019)
Article
Engineering, Environmental
Vepika Kandjou, Ana M. Perez-Mas, B. Acevedo, M. Hernaez, Andrew G. Mayes, Sonia Melendi-Espina
JOURNAL OF HAZARDOUS MATERIALS
(2019)
Article
Chemistry, Applied
Vepika Kandjou, Miguel Hernaez, Beatriz Acevedo, Sonia Melendi-Espina
PROGRESS IN ORGANIC COATINGS
(2019)
Article
Engineering, Chemical
Vepika Kandjou, Zoraida Gonzalez, Beatriz Acevedo, Jose M. Munuera, Juan I. Paredes, Sonia Melendi-Espina
Summary: This study analyzed the influence of key properties of graphene oxide (GO) sheets on the performance of nanofiltration membranes for water purification. GO water suspensions with different lateral sizes and oxygenated functional group distributions were prepared by controlling sonication time, showing a significant impact on membrane rejection values. The findings suggest that the physicochemical characteristics of GO play a crucial role in determining membrane performance in water purification applications.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Chemistry, Applied
Zoraida Gonzalez, Beatriz Acevedo, Georgeta Predeanu, Sorin M. Axinte, Marius-Florin Dragoescu, Valerica Slavescu, Juan J. Fernandez, Marcos Granda, Grazyna Gryglewicz, Sonia Melendi-Espina
Summary: Research has shown that microwave-assisted heating is a more energy efficient process for producing carbon precursors, with electricity savings of up to 60%. The graphites produced from microwave-derived precursors exhibit excellent graphitization degrees, making them suitable for synthesizing graphene-like materials similar to those obtained from conventional means.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Daria Minta, Zoraida Gonzalez, Sonia Melendi-Espina, Grazyna Gryglewicz
Summary: Thermally reduced graphene oxides (TRGOs) and polyaniline (PANI) were used to synthesize binary nanocomposites (PANI/TRGO) via a one-pot facile hydrothermal method. The morphology of TRGOs was found to significantly affect the distribution of PANI in the composites, with PANI/TRGO-700 showing a more homogeneous distribution. The PANI/TRGO-700 composite exhibited better performance as an active material for dopamine sensing, with low detection limit, excellent sensitivity, and good stability.
SURFACES AND INTERFACES
(2022)
Article
Engineering, Chemical
Vepika Kandjou, Miguel Hernaez, Maria D. Casal, Sonia Melendi-Espina
Summary: Graphene Oxide (GO) shows great potential in water purification as a substitute to conventional membrane materials, but faces challenges due to swelling. Crosslinkers can improve the stability and performance of GO membranes. This study investigates the relationship between material quantity and membrane performance, and identifies the optimal crosslinker and GO concentrations through experimental measurements.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Chemistry, Analytical
Ignacio Vitoria, Elieser E. Gallego, Sonia Melendi-Espina, Miguel Hernaez, Carlos Ruiz Zamarreno, Ignacio R. Matias
Summary: In this work, the combination of LMR-based sensing technology on planar waveguides and the use of a GO thin film as a sensitive coating is presented to monitor ethanol, water, and acetone. Experimental results showed a sensitivity of 3.1, 2.0, and 0.6 pm/ppm for ethanol, water, and acetone respectively, with a linearity factor R-2 > 0.95 in all cases.
Article
Energy & Fuels
Agata Moyseowicz, Zoraida Gonzales, Sonia Melendi-Espina, Beatriz Acevedo, Georgeta Predeanu, Sorin M. Axinte, Juan J. Fernandez, Marcos Granda, Daria Minta, Adam Moyseowicz, Grazyna Gryglewicz
Summary: This study aimed to develop doping procedures to introduce nitrogen functionalities on an activated carbon derived from anthracene oil for wide voltage asymmetric capacitors. Nitrogen-doped activated carbons (N-ACs) with different nitrogen content and speciation were obtained by tailoring the temperature treatment and applying ammonia solution under hydrothermal conditions. N-ACs exhibited excellent capacitive behavior and long-life cycle, and high energy densities were achieved in full carbon asymmetric supercapacitors incorporating N-ACs as negative electrodes. The pyridinic and quaternary nitrogen species of N-ACs were found to play a critical role in improving conductivity and specific capacitance.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Engineering, Multidisciplinary
Vepika Kandjou, Beatriz Acevedo, Sonia Melendi-Espina
Summary: This study investigated the use of a compound containing amine groups, melamine, to covalently crosslink graphene oxide (GO) in order to counteract the pore size widening phenomenon and improve nanofiltration performance. The successful confirmation of covalent interactions between GO and melamine was achieved through various characterization techniques. Subsequently, crosslinked membranes were fabricated and their surface morphology was observed using scanning electron microscopy. A lab-scale nanofiltration device was also constructed to analyze flux and rejection rates. The results demonstrated that covalent crosslinking significantly improved the rejection rate of methylene blue to 100%, indicating enhanced structural integrity of GO membranes.
RESULTS IN ENGINEERING
(2023)
