Molecularly imprinted electropolymerization on a metal-coated optical fiber for gas sensing applications

González-Vila, Álvaro; Debliquy, Marc; Lahem, Driss; Zhang, Chao; Mégret, Patrice; Caucheteur, Christophe

doi:10.1016/j.snb.2017.01.084

Cited by 75 publications

(28 citation statements)

References 51 publications

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“…At first, the RI of pH-indicating solutions were kept the same in the experiment; however, the influence of the RI of the analytes to the sensor should be understood in the following study. Second, several functional coating techniques could be involved in this category for providing benefits, such as electropolymerization coating, metal coating [49] and optical functionalization [50]. Third, the thinner fiber, which is anticipated to have higher pH sensitivity, may result in higher insertion loss.…”

Section: Discussionmentioning

confidence: 99%

A Miniature pH Probe Using Functional Microfiber Bragg Grating

Ran

Xiao

Zhang

et al. 2020

Optics

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Operando and precisely probing aqueous pH is fundamentally demanded, both in chemical and biological areas. Conventional pH probes, subjected to the larger size, are probably unfit for application in some extreme scenarios, such as a trace amount of samples. In this paper, we have further developed the pH sensor that leverages the microfiber Bragg grating with an ultra-compact size down to an order of magnitude of 10−14 m3. Using the electrostatic self-assembly layer-by-layer technique, the functional film consisting of sodium alginate, which harnesses a pH-dependent hygroscopicity, is immobilized on the fiber surface. Consequently, the alteration of aqueous pH could be quantitatively indicated by the wavelength shift of the grating resonance via the refractive index variation of the sensing film due to the water absorption or expulsion. The grating reflections involving fundamental mode and higher order mode exhibit the sensitivities of −72 pm/pH and −265 pm/pH, respectively. In addition, temperature compensation can be facilitated by the recording of the two reflections simultaneously. Furthermore, the modeling and simulation results predict the pivotal parameters of the configuration in sensitivity enhancement. The proposed proof-of-concept enriches the toolbox of pH sensor for catering to the need of detection in some extremely small spaces—for example, the living cells or the bio-tissues.

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Section: Discussionmentioning

confidence: 99%

A Miniature pH Probe Using Functional Microfiber Bragg Grating

Ran

Xiao

Zhang

et al. 2020

Optics

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“…Molecularly imprinted sol–gels were created for TNT using covalently bound template molecules linked to the matrix through 1 or 2 carbamate linkages. González-Vila et al [ 34 ] focused on an optical fiber for formaldehyde gas detection. The optical fiber was coated with a layer of MIP based on polypyrrole, which is a conductive polymer.…”

Section: Molecularly Imprinted Gas Sensorsmentioning

confidence: 99%

Gas Sensors Based on Molecular Imprinting Technology

Zhang

Liu

2017

Sensors

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Molecular imprinting technology (MIT); often described as a method of designing a material to remember a target molecular structure (template); is a technique for the creation of molecularly imprinted polymers (MIPs) with custom-made binding sites complementary to the target molecules in shape; size and functional groups. MIT has been successfully applied to analyze; separate and detect macromolecular organic compounds. Furthermore; it has been increasingly applied in assays of biological macromolecules. Owing to its unique features of structure specificity; predictability; recognition and universal application; there has been exploration of the possible application of MIPs in the field of highly selective gas sensors. In this present study; we outline the recent advances in gas sensors based on MIT; classify and introduce the existing molecularly imprinted gas sensors; summarize their advantages and disadvantages; and analyze further research directions.

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“…In the case a conducting monomer is used as backbone (polypyrrole) in the reaction, electro-polimerization can be used to induce the MIP synthesis, ensuring that it is properly attached onto the substrate. The three layers involved (fibre cladding, gold thin coating and MIP) are shown in Figure 30 : even with a thickness below 100 nm, a SPR spectral shift of 2 pm per formaldehyde ppm has been reported [ 152 ].…”

Section: Nano and Microstructured Materials For Sensingmentioning

confidence: 99%

“… SEM image for a MIP coated onto an optical fibre by electropolymerization. Reprinted from [ 152 ] with permission from Elsevier. …”

Section: Figurementioning

confidence: 99%

Micro and Nanostructured Materials for the Development of Optical Fibre Sensors

Elosúa

Arregui

Villar

et al. 2017

Sensors

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The measurement of chemical and biomedical parameters can take advantage of the features exclusively offered by optical fibre: passive nature, electromagnetic immunity and chemical stability are some of the most relevant ones. The small dimensions of the fibre generally require that the sensing material be loaded into a supporting matrix whose morphology is adjusted at a nanometric scale. Thanks to the advances in nanotechnology new deposition methods have been developed: they allow reagents from different chemical nature to be embedded into films with a thickness always below a few microns that also show a relevant aspect ratio to ensure a high transduction interface. This review reveals some of the main techniques that are currently been employed to develop this kind of sensors, describing in detail both the resulting supporting matrices as well as the sensing materials used. The main objective is to offer a general view of the state of the art to expose the main challenges and chances that this technology is facing currently.

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Molecularly imprinted electropolymerization on a metal-coated optical fiber for gas sensing applications

Cited by 75 publications

References 51 publications

A Miniature pH Probe Using Functional Microfiber Bragg Grating

A Miniature pH Probe Using Functional Microfiber Bragg Grating

Gas Sensors Based on Molecular Imprinting Technology

Micro and Nanostructured Materials for the Development of Optical Fibre Sensors

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