Distributed fiber optic pH sensors using sol-gel silica based sensitive materials

Lü, Fei; Wright, Ruishu; Lü, Ping; Cvetic, Patricia; Ohodnicki, Paul R.

doi:10.1016/j.snb.2021.129853

Cited by 37 publications

(18 citation statements)

References 36 publications

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“…The development of OFS has expanded in recent years, favoring advances in different areas such as telecommunications [17,18], materials chemistry [19,20], microelectronics [21][22][23], and nanotechnology [24][25][26]. Focusing on the area of chemistry, most of the existing OFS are based on transduction principles such as fluorescence [27][28][29][30] or absorbance [31,32]. In the mentioned cases, the analytical response is achieved by changing the optical properties of a fixed recognition agent on a solid support due to the interaction with the species to be determined.…”

Section: Fundamentalsmentioning

confidence: 99%

“…Moreover, OIH materials enable the incorporation of different components that introduce complementary functions to the material such as UV protection [21], anti-reflection [22], moisture resistance [23,24], corrosion inhibition [25], and adhesion protection [26]. Sol-gel is one of the most effective synthetic methods to produce OIH materials using organic solvents at mild temperatures [19,27]. It is also recognized as green, low-cost, and a versatile route [28].…”

Section: Introductionmentioning

confidence: 99%

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Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

et al. 2021

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The use of advanced sensing devices for concrete and reinforced concrete structures (RCS) is considered a rational approach for the assessment of repair options and scheduling of inspection and maintenance strategies. The immediate benefits are cost reduction and a reliable prevention of unpredictable events. The use of optical fiber sensors (OFS) for such purposes has increased considerably in the last few years due to their intrinsic advantages. In most of the OFS, the chemical transducer consists of immobilized chemical reagents placed in the sensing region of the optical sensor by direct deposition or by encapsulation in a polymeric matrix. The choice of the support matrix impacts directly on the performance of the OFS. In the last two decades, the development of OFS functionalized with organic–inorganic hybrid (OIH) sol–gel membranes have been reported. Sol–gel route is considered a simple method that offers several advantages when compared to traditional synthesis processes, allowing to obtain versatile materials with unique chemical and physical properties, and is particularly valuable in the design of OIH materials. This review will provide an update of the current state-of-the-art of the OFS based on OIH sol-gel materials for concrete and RCS since 2016 until mid-2021. The main achievements in the synthesis of OIH membranes for deposition on OFS will be discussed. The challenges and future directions in this field will also be considered, as well as the main limitations of OFS for RCS monitoring.

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Section: Fundamentalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

et al. 2021

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“…One of such perspective technologies is fiber optical sensors (FOS). FOS have multiple advantages such as an immunity to corrosion [2][3][4] and electromagnetic interference [3][4][5][6][7], the capability for distributed and long-distance measurements [8,9], harsh environment and high-temperature durability [10], high precision [8,11], easy integration [8,11] and high sensitivity [3,9,12], which can be efficiently utilized for necessary applications.…”

Section: Introductionmentioning

confidence: 99%

Road Pavement Structural Health Monitoring by Embedded Fiber-Bragg-Grating-Based Optical Sensors

Braunfelds

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Šķēls

et al. 2022

Sensors

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Fiber Bragg grating (FBG) optical sensors are state-of-the-art technology that can be integrated into the road structure, providing real-time traffic-induced strain readings and ensuring the monitoring of the road’s structural health. By implementing specific FBG sensors, it is possible to detect each vehicle’s axle count and the induced strain changes in the road structure. In this study, FBG sensors are embedded at the top of the 240-mm-thick cement-treated reclaimed asphalt pavement mixture layer of the road (specifically, 25 mm deep within the road). Optical sensors’ signal interrogation units are used to measure the strain and temperature and collect data of the road’s passing vehicles, starting from passenger cars that have two axles and up to heavy trucks that have six axles. Passenger cars with 2 axles generate a typical (90% events) strain of 0.8–4.1 μm/m, the 2-axle minibus 5.5–8.5 μm/m, 2–3-axle trucks 11–26 μm/m, but 4–6-axle trucks 14–36 μm/m per each axle. A large number of influencing parameters determine the pavement design leading to the great uncertainty in the prediction of the strain at the boundary between the asphalt surface and cement-treated base layers. Real-time strain and temperature measurements help to understand the actual behavior of the pavement structure under an applied load, thus assisting in validating the proposed pavement design.

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“…pH‐sensitivite coating can act as their sensing element whose photo‐physical properties change with pH, and this change is converted into optical signal transmitted by the fiber optic cable [1c,6a,7] . In this sense, developing a stable, selective and sensitive pH sensing layer is crucial for fiber optic pH sensors [8] …”

Section: Introductionmentioning

confidence: 99%

“…[1c,6a,7] In this sense, developing a stable, selective and sensitive pH sensing layer is crucial for fiber optic pH sensors. [8] Silica films are considered as excellent candidates for the fiber optic sensing layer. [8][9] In addition to the general advantages of inorganic films, such as good thermal stability, mechanical properties and durability, silica films are also characterized by easy availability of raw materials, low cost, good light transmission, high selectivity and easy control of membrane pore size.…”

Section: Introductionmentioning

confidence: 99%

α‐Al₂O₃/Organo‐Modified Silica pH Sensing Film with High Alkali Resistance and Sensitivity

2022

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In order to develop a stable and sensitive layer for optical pH sensors which can be used in a wide pH range with long service life, we prepared an α-Al 2 O 3 /organo-modified silica pH composite sensing film by a sol-gel method with thymol blue as the indicator and α-Al 2 O 3 as the nano-reinforced filler. The α-Al 2 O 3 nanoparticles enable the pH sensing film to test solutions in the pH range of 1-12, with good reversibility, sensitivity and excellent resistance to strong acids and bases. Its alkaline resistance at pH = 12 is far superior to its silica counterparts, and it can remain stable for over 22 days at pH = 12. This study provides theoretical and experimental support for improving the acid and alkaline resistance of the silica gels. The α-Al 2 O 3 / organo modified pH sensing film is expected to provide stable pH testing in strongly alkaline environment (pH = 12) and have wide application prospects.

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Distributed fiber optic pH sensors using sol-gel silica based sensitive materials

Cited by 37 publications

References 36 publications

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

Road Pavement Structural Health Monitoring by Embedded Fiber-Bragg-Grating-Based Optical Sensors

α‐Al₂O₃/Organo‐Modified Silica pH Sensing Film with High Alkali Resistance and Sensitivity

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Distributed fiber optic pH sensors using sol-gel silica based sensitive materials

Cited by 37 publications

References 36 publications

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

Road Pavement Structural Health Monitoring by Embedded Fiber-Bragg-Grating-Based Optical Sensors

α‐Al2O3/Organo‐Modified Silica pH Sensing Film with High Alkali Resistance and Sensitivity

Contact Info

Product

Resources

About

α‐Al₂O₃/Organo‐Modified Silica pH Sensing Film with High Alkali Resistance and Sensitivity