Optical Chemical Sensors:Design and Applications

Lobnik, Aleksandra; Turel, Matejka; Urek, Špela Korent

doi:10.5772/31534

Cited by 32 publications

(30 citation statements)

References 111 publications

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“…Microemulsion polymerization A microemulsion is a stable, transparent mixture of two immiscible liquids (such as oil and water), and (co)surfactants in order to e.g. lower the tension of the oil-water interface [11,106]. For the polymerization (Fig.…”

Section: Frequency-domain Measurementsmentioning

confidence: 99%

“…The polymerization is terminated by a chain-transfer reaction to a monomer [106]. If the oil phase is dispersed in water (O/W), it is referred to as direct microemulsion polymerization, while dispersion of the water phase in oil (W/O) is called reversed [11], inverse, or bicontinuous [106] microemulsion polymerization. Emulsion polymerization allows relatively high throughput and is flexible regarding material and solvents, as all immiscible O/W and W/O combinations can be used [107].…”

Section: Frequency-domain Measurementsmentioning

confidence: 99%

“…Many of the used sensor systems rely on analytespecific changes in the optical properties, such as luminescence, which has advantages over electrochemical sensors. For example, luminescence-based sensor systems do not suffer from electromagnetic interferences [10,11], are inexpensive [11,12], easy to miniaturize [12] and optimize in terms of sensitivity [11,13]. They also have very robust read-out options, such as ratiometric or lifetime-based read-out of the analyte-dependent optical signal [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Nanoparticle- and microparticle-based luminescence imaging of chemical species and temperature in aquatic systems: a review

et al. 2019

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Most aquatic systems rely on a multitude of biogeochemical processes that are coupled with each other in a complex and dynamic manner. To understand such processes, minimally invasive analytical tools are required that allow continuous, real-time measurements of individual reactions in these complex systems. Optical chemical sensors can be used in the form of fiber-optic sensors, planar sensors, or as micro-and nanoparticles (MPs and NPs). All have their specific merits, but only the latter allow for visualization and quantification of chemical gradients over 3D structures. This review (with 147 references) summarizes recent developments mainly in the field of optical NP sensors relevant for chemical imaging in aquatic science. The review encompasses methods for signal read-out and imaging, preparation of NPs and MPs, and an overview of relevant MP/NP-based sensors. Additionally, examples of MP/NP-based sensors in aquatic systems such as corals, plant tissue, biofilms, sediments and watersediment interfaces, marine snow and in 3D bioprinting are given. We also address current challenges and future perspectives of NP-based sensing in aquatic systems in a concluding section.

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Section: Frequency-domain Measurementsmentioning

confidence: 99%

Section: Frequency-domain Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanoparticle- and microparticle-based luminescence imaging of chemical species and temperature in aquatic systems: a review

et al. 2019

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“…Moreover, they often leak uncontrollably from the cells and quickly lose their photochemical properties. 33 In trying to overcome these limitations, the idea of engaging dendrimers has been rapidly developed. Although PAMAM and PPI dendrimers have so-called non-traditional intrinsic fluorescence (NTIF) -reviewed later in this article -this phenomenon is not yet properly understood.…”

Section: What Makes Dendrimer a Promising Fluorescent Probe?mentioning

confidence: 99%

Dendrimers for fluorescence‐based bioimaging

Trzepiński

Klajnert‐Maculewicz

2017

J of Chemical Tech & Biotech

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Dendrimer science is a relatively new branch of nanotechnology focused on non‐linear macromolecules called dendrimers. These hyperbranched polymers are characterized by monodispersity, highly defined structure and – depending on specific type of dendrimer – good biocompatibility. Due to the possibility of encapsulation or surface conjugation of guest molecules on a dendrimer it can serve as delivery agent in life sciences. For bioimaging based on fluorescence dendritic polymers were extensively studied as conventional fluorophore carriers. Complexing of organic dyes with these macromolecules improves their solubility and enhances cellular uptake. Moreover, it helps overcome other limitations in using them for photobleaching, and their lack of specificity or cytotoxicity. Protective properties of dendrimers are especially valuable for use with quantum dots, which have great optical potential but contain heavy metals that can adversely affect biological objects. Dendrimer based fluorescent probes have been widely applied in vitro and in vivo bioimaging. An interesting phenomenon is non‐traditional intrinsic fluorescence (NTIF) of dendrimers. Some of them show pH‐ and oxygen‐dependent fluorescence without conjugation with other particles. NTIF is not fully understood, but attempts to take advantage of it for bioimaging have been made. This phenomenon has great potential since it enables dendrimers to serve simultaneously as delivery and diagnostic tool. © 2017 Society of Chemical Industry

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“…This method selected due to its extreme sensitivity and good selectivity, namely 1000 times greater than that of most spectrophotometric measurement technique the advantage of this measurement technique is easy to operate [21].…”

Section: Introductionmentioning

confidence: 99%

Optical Sensing Performance of Multimode Polymer Optical Fiber (POF) Coated with ZnO towards Methanol Vapour

Mulyanti

Pantjawati

Hasanah

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this work, optical sensing performance of multimode polymer optical fiber coated with ZnO towards methanol vapour with different concentrations is studied. The etching process of the POF was carried out using chemical etching method. ZnO was synthesized with sol-gel method to obtain the sensitive material coating. The etched optical fiber was then dipcoated with ZnO and dried at 70oC to enhance the binding of the materials and to remove organic residue. Scanning Electron Microscope (SEM), and X-Ray poer Difraction (XRD) analyses were performed to characterize the ZnO layer. The measurements of optical performance were taken using a spectrophotometer in the optical wavelength in the range of 500-8000nm. The absorbance response of the ZnO coated etched fiber reduced proportionally, upon exposure to methanol vapour with concentration in the range of 5%-50%.

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Optical Chemical Sensors:Design and Applications

Cited by 32 publications

References 111 publications

Nanoparticle- and microparticle-based luminescence imaging of chemical species and temperature in aquatic systems: a review

Nanoparticle- and microparticle-based luminescence imaging of chemical species and temperature in aquatic systems: a review

Dendrimers for fluorescence‐based bioimaging

Optical Sensing Performance of Multimode Polymer Optical Fiber (POF) Coated with ZnO towards Methanol Vapour

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