Fiber sensor based on Lophine sensitive layer for nitrate detection in drinking water

Camas-Anzueto, J.L.; Aguilar-Castillejos, A.E.; Castañón-González, J.H.; Lujpán-Hidalgo, M.C.; León, H.R. Hernández de; Grajales, R. Mota

doi:10.1016/j.optlaseng.2014.04.001

Cited by 21 publications

(7 citation statements)

References 15 publications

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“…• Chemical, in which a chemical reaction with the participation of the analyte gives rise to an analytical signal. 107 • Biochemical, in which a biochemical process is the source of an analytical signal. 108 They may be regarded as sub-groups of the chemical reactions.…”

Section: Optical Sensorsmentioning

confidence: 99%

Application of PAMAM dendrimers in optical sensing

Soršak

Valh

Urek

et al. 2015

Analyst

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The need for an improved sensor performance is always encouraging us towards exploring new materials. Following the invention of dendrimers, the possibility was recognised of using them for improving optical sensor performance. Their more important aspects are their two main structural properties: three-dimensional structure and multiple terminal functional groups. In this review, firstly a brief introduction to dendrimers is provided with the focus on PAMAM dendrimers and optical sensors. Recent advances have been reported in those PAMAM dendrimer-based optical sensors, which are used for the detection of pH, cations, and other analyte.

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Section: Optical Sensorsmentioning

confidence: 99%

Application of PAMAM dendrimers in optical sensing

Soršak

Valh

Urek

et al. 2015

Analyst

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“…Nitrate is an ionized form of nitrogen and an important nutrient for all photosynthetic organisms. Because of their involvement in the biogeochemical cycle in water reservoirs, nitrate sensing in water is vital for monitoring and sustaining water quality conditions [1], [2]. However, the excessive consumption of nitrate by humans may lead to methemoglobinemia…”

Section: Introductionmentioning

confidence: 99%

“…Lalasangi and coworkers [8] reported utilizing an etched fiber Bragg grating (FBG) as a sensing probe to observe the wavelength shift, which corresponds to the variation of nitrate concentrations and resulted in a sensitivity of 1.322 × 10 −3 nm/ppm. Later, Camas-Anzueto et al [1] claimed that by integrating a sensing material (lophine(2,4,5-triphenylimidazole)) with an optical fiber, nitrate could be detected as low as 1 ppm with a good response and recovery time of 20 ms and 40 ms, respectively. Meanwhile, Moo et al (2016) [7] developed a simultaneous measurement procedure using an ultraviolet optical fiber sensor without a coating for detection of nitrate that ranges from 0 to 50 ppm with a detection limit of 0.0017 ppm.…”

Section: Introductionmentioning

confidence: 99%

Bio-Based Polycationic Polyurethane as an Ion-Selective Membrane for Nitrate Tapered Optical Fiber Sensors

et al. 2019

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A novel bio-based polycationic polyurethane as an ion-selective membrane for nitrate sensing was successfully developed. In this work, the intermolecular interactions at active polymeric sites play a primary role in selective nitrate-ion detection. From the experiment, FTIR shows a significant shift from 1543 cm −1 to 1548 cm −1 in N-H bending, indicating that intermolecular interactions occur between the polycationic polyurethane and nitrate. AFM shows that the surface roughness of the polycationic polyurethane decreases from 95.7 nm to 12.2 nm after immersion in nitrate solution. Meanwhile, FESEM images show that the bright area, which represents the hard segment of polycationic polyurethane, decreases after immersion, indicating that the nitrate is interacting with the hard segment of the polycationic polyurethane via intermolecular interaction. Furthermore, EIS shows that the conductivity increases from 2.84 × 10 −11 to 5.34 × 10 −11 S cm −1 after ion exchange occurs between the iodide and nitrate on the polycationic polyurethane. To assess the sensing performance, the sensor probe is fabricated by coating the polycationic polyurethane thin film on the tapered region of an optical fiber. Rapid detection, good repeatability, and a sensitivity of 5.94 × 10 −2 µW/ppm are obtained for nitrate detection using the above bio-based-sensing material. The selectivity study also shows that the sensing material possesses high affinity toward the nitrate ion.

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“…Among the most interesting FSSs are those based on fiber structures (single-multi-single mode fibers), because they allow an interrogation by optical power variation. These systems are known as Power Fiber Specklegram Sensor (PFSS) [19][20][21][22][23][24][25][26]. As in any arrangement of FSS, in the case of PFSS the speckle pattern generated at the end of the SMMF is modified when an external perturbation is applied to the multi-mode fiber, therefore, when a SSMF is spliced to the multimode one, a filtering effect that translates the changes of the speckle pattern into optical power changes is reached.…”

Section: Introductionmentioning

confidence: 99%

“…The main advantages are: very low response time, high stability, low cost, and easy implementation [25]. Likewise, PFSSs have been demonstrated in the measuring of either static or high frequency mechanical perturbations [23,24], in the determination of physical liquid properties [21], and, most recently, in configurations of fiber tapers for the determination of chemical characteristics of materials [26].…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of fiber specklegram sensors by using finite element method (FEM)

et al. 2016

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Although experimental advances in the implementation and characterization of fiber speckle sensor have been reported, a suitable model to interpret the speckle-pattern variation under perturbation is desirable but very challenging to be developed due to the various factors influencing the speckle pattern. In this work, a new methodology based on the finite element method (FEM) for modeling and optimizing fiber specklegram sensors (FSSs) is proposed. The numerical method allows computational visualization and quantification, in near field, of changes of a step multi-mode fiber (SMMF) specklegram, due to the application of a uniformly distributed force line (UDFL). In turn, the local modifications of the fiber speckle produce changes in the optical power captured by a step single-mode fiber (SSMF) located just at the output end of the SMMF, causing a filtering effect that explains the operation of the FSSs. For each external force, the stress distribution and the propagations modes supported by the SMMF are calculated numerically by means of FEM. Then, those modes are vectorially superposed to reconstruct each perturbed fiber specklegram. Finally, the performance of the sensing mechanism is evaluated for different radius of the filtering SSMF and force-gauges, what evidences design criteria for these kinds of measuring systems. Results are in agreement with those theoretical and experimental ones previously reported.

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Fiber sensor based on Lophine sensitive layer for nitrate detection in drinking water

Cited by 21 publications

References 15 publications

Application of PAMAM dendrimers in optical sensing

Application of PAMAM dendrimers in optical sensing

Bio-Based Polycationic Polyurethane as an Ion-Selective Membrane for Nitrate Tapered Optical Fiber Sensors

Numerical modeling of fiber specklegram sensors by using finite element method (FEM)

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