Probes and Polymers for Optical Sensing of Oxygen

Amao, Yutaka

doi:10.1007/s00604-003-0037-x

Cited by 420 publications

(330 citation statements)

References 2 publications

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“…Nevertheless, this method is widely used for the preparation of sensitive thin films or microspheres. 57,58 Polymeric thin films with embedded organic dyes are also very often immobilized on the tip of optical fibers to perform the sensing measurements. 59 The specific incorporation of fluorescent probes in polymers has been recently reviewed by Bosch et al 60 Entrapment of organic dyes and transition metal complexes has also been used to design probes for sensing O 2 .…”

Section: Fluorescent Polymersmentioning

confidence: 99%

Design of fluorescent materials for chemical sensing

2007

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There is an enormous demand for chemical sensors for many areas and disciplines. High sensitivity and ease of operation are two main issues for sensor development. Fluorescence techniques can easily fulfill these requirements and therefore fluorescent-based sensors appear as one of the most promising candidates for chemical sensing. However, the development of sensors is not trivial; material science, molecular recognition and device implementation are some of the aspects that play a role in the design of sensors. The development of fluorescent sensing materials is increasingly captivating the attention of the scientists because its implementation as a truly sensory system is straightforward. This critical review shows the use of polymers, sol-gels, mesoporous materials, surfactant aggregates, quantum dots, and glass or gold surfaces, combined with different chemical approaches for the development of fluorescent sensing materials. Representative examples have been selected and they are commented here.

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Section: Fluorescent Polymersmentioning

confidence: 99%

Design of fluorescent materials for chemical sensing

2007

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“…The materials used in optical oxygen sensors are quite established. [1][2][3][4] Most oxygen sensors employ such widespread indicators as ruthenium(II) polypyridyl complexes, [5][6][7] platinum(II) and palladium(II) porphyrins [8][9][10][11] and their analogues. [12][13][14] Other luminescent indicators are less popular which is explained by their inferior photophysical properties (low absorption coefficients and luminescence quantum yields, short luminescence decay times, poor photostability etc.)…”

Section: Introductionmentioning

confidence: 99%

Exceptional Oxygen Sensing Properties of New Blue Light‐Excitable Highly Luminescent Europium(III) and Gadolinium(III) Complexes

Borisov

Fischer

Saf

et al. 2014

Adv Funct Materials

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New europium(III) and gadolinium(III) complexes bearing 8-hydroxyphenalenone antenna combine efficient absorption in the blue part of the spectrum and strong emission in polymers at room temperature. The Eu(III) complexes show characteristic red luminescence whereas the Gd(III) dyes are strongly phosphorescent. The luminescence quantum yields are about 20% for the Eu(III) complexes and 50% for the Gd(III) dyes. In contrast to most state-of-the-art Eu(III) complexes the new dyes are quenched very efficiently by molecular oxygen. The luminescence decay times of the Gd(III) complexes exceed 1 ms which ensures exceptional sensitivity even in polymers of moderate oxygen permeability. These sensors are particularly suitable for trace oxygen sensing and may be good substitutes for Pd(II) porphyrins. The photophysical and sensing properties can be tuned by varying the nature of the fourth ligand. The narrow-band emission of the Eu(III) allows efficient elimination of the background light and autofluorescence and is also very attractive for use e.g. in multi-analyte sensors. The highly photostable indicators incorporated in nanoparticles are promising for imaging applications. Due to the straightforward preparation and low cost of starting materials the new dyes represent a promising alternative to the state-ofthe-art oxygen indicators particularly for such applications as e.g. food packaging.

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“…For a long time, Clark-type electrodes 10 have been considered the conventional devices for DO measurements, thanks to their robustness and reliability. However, technologies based on optical measurement of DO have received increasing attention in last three decades, as they do not suffer from electrical interference, do not consume oxygen and can be rather inexpensive and easy to miniaturize 11 .…”

mentioning

confidence: 99%

Unconventional ratiometric-enhanced optical sensing of oxygen by mixed-phase TiO2

Lettieri

Pallotti

Gesuele

et al. 2016

Applied Physics Letters

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Abstract. We show that mixed-phase titanium dioxide (TiO2) can be effectively employed as an unconventional, inorganic, dual-emitting and ratiometric optical sensor of O2. Simultaneous availability of rutile and anatase TiO2 PL and their peculiar "anti-correlated" PL responses to O2 allow using their ratio as measurement parameter associated to O2 concentration, leading to an experimental responsivity being by construction larger than the one obtainable for single-phase PL detection. A proof of this concept in given, showing a two-fold enhancement of the optical responsivity provided by the ratiometric approach. Besides the peculiar ratiometric-enhanced responsivity, other characteristics of mixed phase TiO2 can be envisaged as favorable for O2 optical probing, namely: a) low production costs, b) absence of heterogeneous components, c) self-supporting properties. These characteristics encourage experimenting its use for applications requiring high indicator quantities at competitive price, possibly also tackling the need to develop supporting matrixes that carry the luminescent probes and avoiding issues related to the use of different components for ratiometric sensing.Determining the content of molecular oxygen (O2) in gas mixtures and/or aqueous environments is important in many different fields. For example, monitoring the O2 concentration in the exhaust stream of an internal combustion engine provides information on the air-fuel ratio of the combustion process, whose control is relevant for reducing harmful emission [1][2][3] . Knowing the concentration of O2 dissolved in water (also "dissolved oxygen", DO) is also crucial in many applications. DO level is intimately related to the state of health of marine habitats, to the concentration of organic pollutants in water 4 and is of great importance for biological studies. In fact, DO content in cell culture media affects cell growth rate, metabolism and protein synthesis, exerting a decisive influence on the cellular functions and behaviors. To mention a few examples, hypoxia/re-oxygenation induce stem cell like

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Probes and Polymers for Optical Sensing of Oxygen

Cited by 420 publications

References 2 publications

Design of fluorescent materials for chemical sensing

Design of fluorescent materials for chemical sensing

Exceptional Oxygen Sensing Properties of New Blue Light‐Excitable Highly Luminescent Europium(III) and Gadolinium(III) Complexes

Unconventional ratiometric-enhanced optical sensing of oxygen by mixed-phase TiO2

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